Call Forwarding

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Wireles call forwarding call flows for GSM, UMTS, 3G networks

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  • Call Forwarding

    1. 1. Call Forwarding Akash Agrawal
    2. 2. Types <ul><li>CFU </li></ul><ul><li>CFB </li></ul><ul><ul><li>NDUB </li></ul></ul><ul><ul><li>UDUB </li></ul></ul><ul><li>CFNRC </li></ul><ul><li>CFNRY </li></ul>Unconditional Conditional Early Call forwarding (GMSC) Late Call forwarding (VMSC)
    3. 4. Functional Description <ul><li>Registration (register a FTN, FTN to basic service group..) </li></ul><ul><li>Erasure (erase a FTN, basic service group ) </li></ul><ul><li>Activation (activate CF services) </li></ul><ul><li>Deactivation (withdraw CF/SS ) </li></ul><ul><li>Interrogate (get CF data) </li></ul>
    4. 5. State Transition Model
    5. 6. CFU MS B has CFU Activated. SRI PRN SRI ACK IAM PRN ACK Notify GMSC must increment fwd counter by 1 GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup SRI ACK (FTN, CFU) IAM 1. To fixed terminal 2. To MS SRI (NOF = 1, IT = forwarding)
    6. 7. CFNRC (MS not reachable detected on GMSC) PRN (IMSI b) PRN SRI ACK IAM PRN ACK Notify GMSC must increment fwd counter by 1 SRI VLR reported Subscriber B is not reachable due to derregister or Purge or detach. GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup IAM 1. To fixed terminal 2. To MS SRI (NOF = 1, IT = forwarding) SRI ACK (FTN, Absent MSb) PRN ACK (Absent MSb)
    7. 8. CFB (NDUB) PRN (IMSI b) 2. To MS SRI (MS C) PRN SRI ACK IAM PRN ACK Notify SRI MSC detect NDUB when paging MS, MSC gets forwarding info from VLR IAM Notify GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup IAM 1. To fixed terminal SRI ACK PRN
    8. 9. CFB (UDUB) PRN (IMSI b) 2. To MS IAM Notify SRI MSC detects UDUB during call setup. MSC gets FTN and forwarding info from VLR IAM Notify SRI (MS C) PRN SRI ACK PRN ACK MSc SETUP UDUB GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup IAM 1. To fixed terminal SRI ACK PRN
    9. 10. CFNRY PRN (IMSI b) 2. To MS IAM Notify SRI MSC starts no reply timer and the timer expired. VLR returns FTN, MSC forwards call. IAM Notify SRI (MS C) PRN SRI ACK PRN ACK MSc SETUP Call Confirm TIME OUT GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup IAM 1. To fixed terminal SRI ACK PRN
    10. 11. CFNRC (Radio Congestion) PRN (IMSI b) 2. To MS IAM Notify SRI MSC detects radio Congestion. VLR returns FTN, MSC increments redirection count by 1 IAM Notify SRI (MS C) PRN SRI ACK PRN ACK MSc SETUP Call Confirm Radio Congestion GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup IAM 1. To fixed terminal SRI ACK PRN
    11. 12. CFNRC (No Paging Response) PRN (IMSI b) 2. To MS IAM Notify SRI MSC waits for paging response and the timer expired. VLR returns FTN IAM Notify SRI (MS C) PRN SRI ACK PRN ACK MSc Paging No Response GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup IAM 1. To fixed terminal SRI ACK PRN
    12. 13. CFNRC (MS Detached) PRN (IMSI b) 2. To MS SRI (MS C) PRN SRI ACK IAM PRN ACK Notify SRI VLR detects MS detached. VLR returns FTN. IAM Notify GMSC HLRb MSC/VLRb HLRc PSTNc MSa MSC/VLRc Setup IAM 1. To fixed terminal SRI ACK PRN
    13. 14. THANK YOU 

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