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Report to S1 on:ad-hoc on Handover and
Cell Selection(Sophia Antipolis, 9/10 June 99)
David Cooper, 21.6.99
3GPP TSG-S1 XXX (99)492Quebec 6-9 July 1999 Agenda: 6.6.0Source: Vice Chair
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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
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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
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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.
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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
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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
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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
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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
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Conclusions
• Contributions needed to 22.129, especially to cover scenarios
• Contributions needed on PLMN and radio access system selection