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ABSTRACT: This contribution discusses where we are with IS-2000 3G1x Femto system selection, and what we need to look for in a solution.
TITLE: Femtocell System Selection
3GPP2 Femto Cell Workshop
RECOMMENDATION: <Discuss / FYI >
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S00-FEMTO-20070915-008<Femtocell System Selection>
How does an IS-2000 mobile find the Femto? Depending on deployment, same carrier or dedicated carrier
Most cases will behave like dedicated carrier, since the Macro will typically have more carriers than the Femto
Idle mode General Neighbor List (GNL) message on Macro has frequency information
of Femto neighbors As long as the Femto EC/I0 is 3dB stronger than the Macro EC/I0, the IS-2000
mobile will perform the idle hand-off If the Femto is located too close to an unloaded Macro, this condition may
fail Active mode (future)
Macro can direct mobile to search other frequencies using Candidate Frequency Search (CFS)
IS-95 (pre-IS-2000) 2G mobiles cannot receive either the GNL or CFS message, will not be able to find most Femtos Femto on dedicated carrier, or Femto on macro carrier, not the one hashed to by 2G mobile
IS-2000 mobile/Femto system selection still needs more thinking Prefer solutions that do not change the air interface Need a solution for the “exclusion zone”
Especially when there are calls on the Femto
Willing to entertain other solutions ALU working on alternate solutions not yet ready for publication