1. Mobile Sensing Measurement Report for supporting 1x Active Hand-in Peerapol Tinnakornsrisuphap (peerapol@qualcomm.com) Chirag Patel (cpatel@qualcomm.com) Doug Knisely (dknisely@airvana.com) May 11 th, 2009peerapol@qualcomm.comcpatel@qualcomm.comdknisely@airvana.com Notice ©2009. All rights reserved. The contributors 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. The contributors are 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 the contributors 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 the contributors. The contributors specifically reserves the right to amend or modify the material contained herein and nothing herein shall be construed as conferring or offering licenses or rights with respect to any intellectual property of the contributors other than provided in the copyright statement above.

2. Overview To support 1x active hand-in using mobile sensing approach (refer to contribution A20- 20081027-008r0), the FCS needs to request candidate target FAPs to perform measurement and report measurement information to the FCS This presentation discusses the definition, range and granularity of this information

3. How to determine hand-in candidate? The best FAP hand-in target should be the FAP that can hear the MS on the RL –and- has the best FL pilot to the MS RL pilot FAP1 FAP2 In this example, while the MS is physically closer to FAP1 and FAP1 can detect the MS strongest RL signal, it is not the suitable handoff target as its FL coverage does not reach the MS. The FL pilot power is adjusted based on various factors and is likely different for each FAP FL coverage RL pilot

4. Using RL pilot measurement and FL Pilot Tx power Ecp RL measurements identify a FAP with the best RL Since FAPs may have different FL Tx powers, using Ecp FL-Tx together with Ecp RL helps in identifying FAP with the best FL to the MS – Refer to the formulation in the appendix Example: when FAPs sense a MS’s RL and feed back (Ecp FL_Tx + Ecp RL ) to the network, the HO target FAP can be identified as the one with the largest (Ecp FL_Tx + Ecp RL ) metric The remaining of this contribution describes the definition and how to code these fields

5. Femto Transmit Pilot Power Definition: The FAP shall set this field to indicate the Pilot Channel Power of its service channel Value (8 bits): – The FAP shall set this field to the two’s complement representation of the Pilot Channel Power of its service channel (in dBm) Translate into range of [-128, 127] dBm Typical range: -30 dBm to +20 dBm, 1 dBm granularity

6. Measured Received Pilot Power Definition: The FAP shall set this field to the received power, measured at the base station RF input ports, of the pilot channel of the MS Value (8 bits): – The FAP shall set the value of this field to -2 x the received power (in dBm) Translate into range of [-127.5, 0] dBm at 0.5 dBm granularity – Typical Rx pilot power (Ecp): -10 dBm to -120 dBm Assuming Tx reverse-link range: -90 dBm to 23 dBm Pathloss: 30 dB to 150 dB

7. Measurement Report Time The FCS indicates when it expects the FAP to send measurement response back If FAP does not have enough time to measure satisfactorily, it sends back results to FCS with error cause value indicating not enough time to measure

8. Open issues Measurement Start Time and Duration – Whether it is necessary for each FAP to start the measurement at the same time and whether the measurement should last the same duration

9. Recommendation The contributors recommend that the following information are reported in measurement response: – Femto Tx Pilot Power – MS Measured Received Pilot Power – Measurement Report Time

10. DERIVATION OF HANDOFF METRIC Appendix

11. Comparing best FL between two FAPs Consider two FAPs using the same pilot PN, their FL Ecp/Io (in dB) at the MS are: where Ecp FL1_Tx and Ecp FL2_Tx are FL pilot Tx powers (dBm) and PL FL1 and PL FL2 are FL path loss (dB) from the two FAPs and Io (dBm) is the total received signal power plus noise. Conceptually, HO target is the FAP with the best FL Ecp/Io or equivalently the best FL Ecp and can be determined by using the following HO metric (in dB): If the result is greater than zero, then FAP1 is the target FAP

12. Estimating the Pathloss Assuming FL and RL path losses are identical (PL FL1 = PL RL1, PL FL2 = PL RL2 ), RL pilot measurements at FAP can be used to get the relative pathloss as where Ecp RL_Tx is MS’s pilot Tx power (dBm). The HO decision metric becomes i.e., FAP1 is the target FAP if the above calculation is greater than zero