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

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

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

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.

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

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

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

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

Conclusions

• Contributions needed to 22.129, especially to cover scenarios

• Contributions needed on PLMN and radio access system selection