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All Rights Reserved © Alcatel-Lucent 2007 SOURCE:Dennis Ong, Alcatel-Lucent John Burgess Alcatel-Lucent CONTACT: hdong@alcatel-lucent.comhdong@alcatel-lucent.com jkburgess@alcatel-lucent.com 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: 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-20070915-008
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All Rights Reserved © Alcatel-Lucent 2007 2 | 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
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All Rights Reserved © Alcatel-Lucent 2007 3 | 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
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All Rights Reserved © Alcatel-Lucent 2007 4 | 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
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All Rights Reserved © Alcatel-Lucent 2007 5 | 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
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All Rights Reserved © Alcatel-Lucent 2007 6 | 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
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All Rights Reserved © Alcatel-Lucent 2007 7 | 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
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All Rights Reserved © Alcatel-Lucent 2007 8 | 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
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