All Rights Reserved © Alcatel-Lucent 2007 SOURCE:Dennis Ong, Alcatel-Lucent John Burgess Alcatel-Lucent CONTACT: ABSTRACT: This contribution discusses where we are with IS G1x Femto system selection, and what we need to look for in a solution. TITLE: Femtocell System Selection 3GPP2 Femto Cell Workshop RECOMMENDATION: Alcatel-Lucent grants a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. Alcatel-Lucent is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which incorporates this contribution. This document has been prepared by Alcatel-Lucent to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on Alcatel-Lucent. Alcatel-Lucent specifically reserves the right to amend or modify the material contained herein and to any intellectual property of Alcatel-Lucent other than provided in the copyright statement above. S00-FEMTO

All Rights Reserved © Alcatel-Lucent | October 15-16, 2007 Technical Discussion: 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 E C /I 0 is 3dB stronger than the Macro E C /I 0, 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

All Rights Reserved © Alcatel-Lucent | October 15-16, 2007 Technical Discussion: System Selection Where is the Femto is located too closely to Macro, key to colors Direct Line-of-Sight Femto Achieves Full Range (Blue) Femto Reduced Range (no penetration losses) Femto Reduced Range, penetration Losses: 15dB external wall for Macro 7db internal wall for Femto Femto Reduced Range, penetration Losses: 15dB external wall for Macro

All Rights Reserved © Alcatel-Lucent | October 15-16, 2007 Technical Discussion: System Selection Where is the Femto is located too closely to Macro? Urban Direct Line-of-Sight Femto 50 mW PCS  16W  Half the size of Cellular cell below Cellular  20W

All Rights Reserved © Alcatel-Lucent | October 15-16, 2007 Technical Discussion: System Selection Where is the Femto is located too closely to Macro? Countryside Direct Line-of-Sight Femto 50 mW PCS  16W  Half the size of Cellular cell below Cellular  20W

All Rights Reserved © Alcatel-Lucent | October 15-16, 2007 Technical Discussion: System Selection How to improve the success of idle IS-2000 mobiles finding the right Femto?  Without changing the standards or the mobiles  Add Femto beacon pilot on some or all MacroCell Carriers (hopping or not)  Will need more than just a pilot to direct idle mobiles to the right carrier Pros  2G mobiles may find the Femto  MacroCell NL population may be easier  Can allot fewer PN offsets if Femto main carrier spread over multiple carriers Cons  RF Interference on multiple carriers  FemtoCell cost increases from additional radio hardware  Better chance for mobiles to idle hand-off to Femtos that do not allow them access

All Rights Reserved © Alcatel-Lucent | October 15-16, 2007 Technical Discussion: System Selection How to improve the success of idle IS-2000 mobiles finding the right Femto?  Allowing changing the standards and the mobiles  Airvana’s Preferred User Zone List (PUZL) changes Pros  Mobile finds the allowed Femtos without guesswork  Mobile does not spend much time idling on unavailable Femtos Cons  Will require changes to the air interface, mobile & network  New P_REV  “Black list” may be difficult to maintain at the Macro

All Rights Reserved © Alcatel-Lucent | October 15-16, 2007 Technical Discussion: System Selection 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