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Handover and Cell Selection in Cellular Systems: Meeting Report

This report summarizes the discussions and conclusions from the meeting on Handover and Cell Selection in Cellular Systems held on 6-9 July 1999 in Quebec. The report covers topics such as handover principles, handover selectivity, radio access selection, and cell selection principles. Contributions are also requested to further enhance the standards in these areas.

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Handover and Cell Selection in Cellular Systems: Meeting Report

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  1. 3GPP TSG-S1 XXX (99)492 Quebec 6-9 July 1999 Agenda: 6.6.0 Source: Vice Chair Report to S1 on:ad-hoc on Handover and Cell Selection(Sophia Antipolis, 9/10 June 99) David Cooper, 21.6.99

  2. Structure of Meeting • Handover 1st day (3 slides) • Cell selection 2nd day (3 slides) • 60 people present • SMG2, SMG3, SA1, SA2, SA3, RAN2, CN1 or CN2

  3. Handover: Principles agreed • Handover is the special feature of cellular systems that allows the radio resources carrying traffic (‘bearers’) to be changed while still maintaining defined QoS (CR TM004) • Principle: “different operator” means different MCC-MNC (see CR TM004) • Principle: the serving network drives cell selection, NOT the terminal

  4. Handover: Extra work needed in S1 • Handover Selectivity: service requirements needed (1-1, 1-many) • S1 to reflect different handover scenarios in 22.129 Chapter 4, for example at country borders, UMTS in sea of GSM etc. • Check that still have no requirements for Fax handover, even with new Fax requirements.

  5. Handover: Notes for S1 • S1 should note greater difficulty of 1-many network handover as opposed to 1-1 handover • Suggestion (but not concluded): in R99 limit handover relationship to 1-1 case • Roaming relationship is not a prerequisite for handover (!) • eg Foreign UMTS terminal with roaming relationship with ‘New UMTS operator’ may be ‘silently’ handed over to existing GSM

  6. Cell selection:Radio Access selection • Prior to PLMN selection (ie when mobile goes to new country), choice of radio access technology is not the subject of standards, except... • ….multimode terminal seeing one system behaves like a single mode

  7. Cell Selection: principles • Once UMTS network is chosen, choice of radio access technology is determined by the Home and Serving environments. • User preference of radio access mode is not supported

  8. Cell selection: actions for S1 • definition of terms ‘radio access technology’ ‘UTRA mode’ (see CR on terminology). • Review the completeness of our service requirements for network selection, cell selection

  9. Conclusions • Contributions needed to 22.129, especially to cover scenarios • Contributions needed on PLMN and radio access system selection

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