HRPD System Time in LTE tunneled mode May 12-16 Osaka, Japan HRPD System Time in LTE tunneled mode Sources: Jialin zou jialinzou@alcatel-lucent.com Ericsson Octavio Lima octavio.lima@ericsson.com Motorola Javed Khan javed.khan@motorola.com Ke-Chi Jang kcjang@nortel.com Verizon Zheng Zhao Zheng.Zhao@VerizonWireless.com VIA Tony Lee aslee@via-telecom.com Recommendation: Adopt as part of the stage 2 for C.S0087 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. Contributors 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 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 source companies of this contribution. Contributors specifically reserves the right to amend or modify the material contained herein and to any intellectual property of contributors other than provided in the copyright statement above.

Overview Normal Initialization State Protocol (ISP) operation InitializationState.Activate (from ALMP) triggers the activation of the ISP and the AT goes to the Network Determination State After the HRPD network is selected, the AT enters the Pilot Acquisition State After the pilot is acquired, the AT enters the Synchronization State AELMNV single receiver ISP proposal provided mechanism on how the single receiver AT transition through the ISP when in tunnel mode Two HRPD system time mechanism were agreed by 3GPP LTE 49-bit system time for async mode 39-bit system time for sync mode (i.e. sync with CDMA) LTE reference: R2-082530/R2-082541

Timing Synchronization consideration Synchronization State – Timing Synchronization procedures for AT when in tunneling mode Disable the ISPSyncAcq timer Set default value for MaximumRevision (max value) and MinimumRevision (0x00) Define system time acquisition procedure for tunneling mode Specify that the CDMA system time value in SIB-8 is based on zero offset Pilot PN sequence Interpret CDMA system time value in SIB-8 according to LTE system time definition (both sync mode and async mode) Determine CDMA system time at mobile based on the acquired HRPD pilot For Single Rx terminals, this will only occur when measurement gaps permit (active) or DRX periods permit (idle) For Dual Rx terminals, this may occur when measurement control indicates (active) or CDMA neighbors are broadcast in SIB8 (idle) Return a NetworkAcquired indication when CDMA system time at mobile is determined ISP then enter the Inactive State

System Time – Async mode In Async mode, the LTE system timing is independent to CDMA time. The system time resolution is determined from the following factors: The HRPD system time stamp: 37 bits in unit of 26.66…ms, i.e. 32768 CDMA chips After a CDMA pilot is acquired, its PN offset shall be resolved at the AT. The PN offset of closest CDMA neighbor pilots is 64 chips The resolution of the CDMA system time determines the resolution of the search window position, and the inaccuracy of the search window position leads to ambiguity when resolve the PN offset To reduce the chance of ambiguity of resolving PN offset, the resolution of system time is decided to be 1/8 of 64 chip = 8 chips, therefore, the number of the bits of CDMA system time = 49 bits The 36-bit 1x system time stamp in unit 80ms can also be derived from the 49-bit system time

System Time – Sync mode concept CDMA HRPD system time is a 37-bit field in unit of 26.6666ms (frame) The time that can be represented is 116.217616 years based on 01/01/1980 start date 1XRTT system time (based on std) system time field is 36-bit long with unit of 80ms (one super frame) So, 2^36 x 0.08 / 3600 / 24 / 365 = 174.326425 Year (from 1980) Sync Mode: – where LTE frames 10ms frames are aligned with CDMA System time Instead of 49-bits for aysnc mode, HRPD system time can be reduced to 39 bits when transmit over LTE using SIB-8 with increments of 10ms, where 2^39 x 0.01 / 3600 / 24 / 365 = 174.326425 Year

SIB8 System Time Definition Two system time options controlled by EUTRA Synchronization indicator If the indicator is set to “true”, the LTE system time is synchronized to CDMA system time 39-bit system time field is used based on 10ms (SFN) timing unit The system time corresponding to the SFN boundary at or after the ending boundary of the SI-Window (where SIB8 is transmitted) If the indicator is set to “false”, the system time is Async mode 49-bit system time field is used The timing unit is 8chips The system time corresponding to the SFN boundary at or after the ending boundary of the SI-Window The system time specified in SIB8 is based on the zero offset Pilot PN Sequence