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Control Plane Roaming LBS Roaming Meeting, Denver January 18, 2007

Control Plane Roaming LBS Roaming Meeting, Denver January 18, 2007. Control Plane Roaming Update. A few CP deployments out there, with a few more on the way Growing number of Control Plane enabled mobiles Control Plane roaming is important and seems straightforward

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Control Plane Roaming LBS Roaming Meeting, Denver January 18, 2007

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  1. Control Plane Roaming LBS Roaming Meeting, Denver January 18, 2007

  2. Control Plane Roaming Update • A few CP deployments out there, with a few more on the way • Growing number of Control Plane enabled mobiles • Control Plane roaming is important and seems straightforward • It was agreed at previous LBS Roaming Summits that an RLP variant would be used as the protocol between Control Plane MPCs as opposed to IS-41 based ISPOSREQ / isposreq as defined in IS-881 • Openwave has defined such a variant and is in the process of releasing the spec to the CDG IRT and this group • A review of the Openwave spec is required and potential enhancements and standardization efforts need to be considered • The RSP / CRX issues (no access to true serving system information) still need to be resolved

  3. IS-881 Roaming Call Flow

  4. Expected Control Plane Roaming Architecture Visited Operator Home Operator RSP MSC/VLR HLR HLR IP Network (L3) H-MPC H-MPC V-MPC V-PDE LCS Client IS-41 Signaling IP Traffic

  5. RSP Issue • Most operators prefer to use RSP for roaming • RSP provide peering point for SS7/IS-41 exchange between operators • RSP provides intermediary HLR function • During registration, home operator receives generic MSCID provided by RSP • Home operator won’t be able to map generic MSCID to correct V-MPC for L3 interface • Also the message used on the L3 interface to invoke the V-MPC needs to pass the serving MSCID to allow the V-MPC to execute local IS-881 procedures (e.g., invoke the serving MSC)

  6. RSP Issue Illustrated IP Traffic IS-41 Signaling • MS registers and RSP replaces MSC/VLR MSCID with generic RSP MSCID • LCS Client queries H-MPC for roaming MS • H-MPC uses LOCREQ/SMSREQ to receive MSCID (RSP HLR) from HLR • H-MPC needs to map MSCID (RSP HLR) to the IP address of V-MPC • Because MSCID is generic RSP MSCID, the H-MPC doesn’t know where the V-MPC is Visited Operator Home Operator MSCID = MSC/VLR RSP MSC/VLR HLR MSCID = RSP HLR HLR MSCID = RSP HLR IP Network (L3) RSP HLR = ? H-MPC H-MPC V-MPC V-PDE LCS Client

  7. RSP Issue Solution #1 IP Traffic IS-41 Signaling • MS Registers and RSP provides the serving MSCID to home operator • LCS Client queries H-MPC for roaming MS • H-MPC uses LOCREQ/SMSREQ to receive serving MSCID from HLR • H-MPC maps serving MSCID to the IP address of V-MPC • H-MPC performs L3 transaction with V-MPC (passing serving MSCID) Visited Operator Home Operator MSCID = MSC/VLR RSP MSC/VLR HLR MSCID = MSC/VLR HLR MSCID = MSC/VLR Visited Op = 127.4.64.1 IP Network (L3) 127.4.64.1 H-MPC H-MPC V-MPC V-PDE LCS Client

  8. RSP Issue Solution #2 IP Traffic IS-41 Signaling • MS registers and RSP replaces MSC/VLR MSCID with generic RSP MSCID • LCS Client queries H-MPC for roaming MS • H-MPC uses LOCREQ/SMSREQ to receive serving MSCID (that of the RSP) from HLR • H-MPC always creates IP connection (L3) with RSP • RSP maps MS IMSI in L3 messaging to V-MPC IP Address • RSP connects to V-MPC (passing serving MSCID) and provides response to H-MPC Visited Operator Home Operator RSP MSCID = MSC/VLR MSCID = RSP HLR MSC/VLR HLR MSCID = RSP HLR HLR IMSI maps to V-MPC IP Network (L3) H-MPC H-MPC V-MPC V-PDE LCS Client

  9. Next Steps • Review and discuss Openwave’s RLP solution • Gap Analysis of RLP for IS-881 support • Openwave’s changes and perhaps further enhancements • Drive changes through OMA • Review and discuss the RSP / CRX Issues

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