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Roaming issues Priority and Proposed Solution

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  1. Roaming issues Priority and Proposed Solution 2004/12/13 China Unicom

  2. Issues Priority from China Unicom Data Roaming SMS Roaming PRL Enhancement Manual Network Selection and Operator Name Display “+”Plus code dialing Evolution of GTT and T-IMSI

  3. Proper Solution of Data Roaming between Unicom&Roaming Partner Problem Each operator has its own requirement of data roaming solution Inter-CRX testing yet to be conducted Proper Solution Network Solution Billing Settlement

  4. Network Structure for Data Roaming in CU side

  5. Proposed Network Solution—VPDN Solution(Simple IP)

  6. Proposed Network Solution--Continued Setting up L2TP tunnel between visiting PDSN and home LNS Building IP pool in the LNS and IP address assignment in the LNS. Authentication in the home AAA IPsec provisioned between BGW, Accounting packet, Data packet and Authentication packet pass through IPsec between BGW.

  7. Dual Authentication - w/o LCP Re-Negotiation

  8. Billing Settlement In accordance with CDG white paper, direct settlement between operators be adopted. Issue to be left NAS IP address in the accounting message generated in the PDSN is 0.0.0.0, not the real address assigned.

  9. SMS MO Roaming Problem SMS service is very popular in China Strong Requirement for IR SMS MO Solution Network supporting SMS MO and CDR generated in serving MSC 3 rd Party billing&settlement MSCID (or Operator ID) pass through and message settlement.

  10. Manual Network Selection and Operator Name Display Problem 1KByte size of PRL in R-UIM,not all SID/NID can be populated. Camp on not-allowed network. User is not aware where he is. Solution PRL Enhancement Automatically select the network as it was,End User control to acquire new network Display serving network based on MCC/MNC table in the terminal

  11. Manual Network Selection and Operator Name Display --continued Current stage in China Unicom Building a table in the terminal,which include related information of MCC,MNC,network name,etc. The latter terminal will support PRL Enhancement and manual network solution,etc. China Unicom has broadcasted unique MCC&MNC number over national wide network. Issue left MCC&MNC information attained and update

  12. “+”Plus Code Dialing Short term solution Welcome SMS Medium term solution Terminal based solution—Building up relation table in the terminal, which translate “+” to the real access code based on MCC&MNC number received Long term solution Standard solution: IS-2000, IS-875 Network change to IOS4.3 to support ORCM or upgrade to Rev.C to support int’l number type with DTMF?

  13. Introduction of IMSI-T and GTT Translation Problem IRM number resource is exhausting TDS update is too frequent and data load is too complicated and capacity wasted. Solution Replace MIN number to IMSI-T number, feasible roadmap is MIN—IMSI-M—IMSI-T GTT Translation edge out PC+SSN Each network element should be assigned GT address

  14. GTT Translation in China Unicom

  15. 谢 谢 THANKS