June, 2008 C2 – Company Confidential ABSTRACT: Required changes for supporting RSRQ based HRPD to LTE re-selection. This is a stage 2 proposal for C.S0087-A. TITLE: Enhancement for RSRQ Based HRPD to LTE Idle Handoff TSG-C RECOMMENDATION: Discuss and adopt. The source companies of this contribution grant 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 source companies of this contribution 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 The source companies of this contribution 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 source companies of this contribution. The source companies of this contribution specifically reserves the right to amend or modify the material contained herein and to any intellectual property of The source companies of this contribution other than provided in the copyright statement above. SOURCE: Jialin Zou, Satish Kanugovi (Alcatel-Lucent)Zheng Zhao, Jingyi Zhou (Verizon) Ke-Chi Jang (Ericsson)Tony Lee (VIA Telecom)

C2 – Company Confidential 2 | LTE/HRPD Interworking | June, 2008 Background and Motivations Reference Signal Received Quality ( RSRQ) has been adopted as the reselection (idle HO) metric in LTE  For better performance, RSRQ has been included in TS v9.3.0 (Rel. 9)  It was agreed in RAN2#71 meeting that EUTRAN should be able to measure RSRQ as the LTE/CDMA reselection metric. See reference [1]. It is desired that CDMA should be in sync with LTE Rel9 supporting RSRQ  If RSRQ is used at EUTRAN for UEs reselecting CDMA but CDMA does not support LTE RSRQ measurement, ping-ponging between CDMA and LTE could be introduced  The cause: LTE to CDMA reselection measuring RSRQ; CDMA to LTE reselection measuring RSRP

C2 – Company Confidential 3 | LTE/HRPD Interworking | June, 2008 Suggested Remedy Add RSRQ related LTE parameters into the E-UTRAN Neighbor List Record  ThreshX-Q, QualMin, QualMinOffset Add the RSRQ related reselection procedures to the existing CDMA to E-UTRAN idle reselection procedures References: [1] R , “Clarification on the use of RSRQ for cell reselection towards GERAN or CDMA” [2] TS , “Physical Layer; Measurements”

C2 – Company Confidential 4 | LTE/HRPD Interworking | June, 2008 Appendix: Definition of RSRQ in Section of [2] DefinitionReference Signal Received Quality (RSRQ) is defined as the ratio N×RSRP/(E-UTRA carrier RSSI), where N is the number of RB’s of the E-UTRA carrier RSSI measurement bandwidth. The measurements in the numerator and denominator shall be made over the same set of resource blocks. E-UTRA Carrier Received Signal Strength Indicator (RSSI), comprises the linear average of the total received power (in [W]) observed only in OFDM symbols containing reference symbols for antenna port 0, in the measurement bandwidth, over N number of resource blocks by the UE from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc. The reference point for the RSRQ shall be the antenna connector of the UE. If receiver diversity is in use by the UE, the reported value shall not be lower than the corresponding RSRQ of any of the individual diversity branches. Applicable forRRC_IDLE intra-frequency, RRC_IDLE inter-frequency, RRC_CONNECTED intra-frequency, RRC_CONNECTED inter-frequency