1. TSG-C SWG2.3 BCMCAHG Source: Lucent Technologies Contact: Krishna Balachandran [krishnab@lucent.com] Kenneth Budka [kbudka@lucent.com] Joseph Kang [jhkang@lucent.com] TITLE: Hybrid Registration for BCMCS: Concept Overview ABSTRACT: RECOMMENDATION: ©2003 Lucent Technologies, Inc. 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. 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 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 to any intellectual property of the contributors. other than provided in the copyright statement above. Discuss and adopt for IS-2000 Rev. D This contribution proposes hybrid registration for BCMCS to allow the network to determine the frequency that is currently being monitored by a mobile station so that it may page the mobile on just that frequency. Hybrid registration achieves the desired objective in typical operational scenarios with fewer registrations than flow or frequency based registration C23-BCMCAHG-20031013-xxx

2. C23-BCMCAHG-20031014-xxx 2 BCMCS Registration Approaches Previously Discussed: –Flow Based Registration: Mobile sends a registration whenever it tunes from one BCMCS flow to another. Problem: Excessive registrations from mobiles constantly switching between BCMCS flows on the same frequency. –Frequency Based Registration: Mobile sends a registration whenever it tunes from one frequency to another. Problem: Excessive registrations from mobiles experiencing several idle handoffs between different frequencies while monitoring a single flow. Problem: In the absence of precise knowledge of the frequency that the mobile is currently monitoring, the network may need to page the mobile on all BCMCS frequencies in addition to the hash-to frequency Proposed Solution: Hybrid Registration –Mobile sends registration when it tunes to a frequency if its presence on that frequency is not known to the network from the BCMCS flow ID for which the mobile previously registered.

3. C23-BCMCAHG-20031014-xxx 3 BCMCS Registration Scenarios: Tuning Between Flows Within Sector 1.Mobile tunes between BCMCS Flows on same frequency Sector A BCMCS Flow 1 BCMCS Flow 2 fxfx Sector A BCMCS Flow 1 BCMCS Flow 2 fxfx fyfy 2.Mobile tunes between BCMCS Flows on different frequencies  Flow Based: Send registration  Frequency Based: Send registration Hybrid Registration: Send registration  Flow Based: Send registration  Frequency Based: No registration  Hybrid Registration: No registration Observation: Hybrid and Frequency Based Registration result in fewer registrations than Flow Based in this case Observation: Hybrid Registration results in same number of registrations as Flow and Frequency Based in this case MS

4. C23-BCMCAHG-20031014-xxx 4 BCMCS Registration Scenarios: Idle Handoff Current SectorNew Sector Flow and Frequency information Flow MS is monitoring Registration required? Flow and Frequency information Flow MS previously registered Flow Based Frequency Based Hybrid Flow 1 on f x Flow 1Flow 1 on f x Flow 1No Flow 1 on f x Flow 1Flow 1 on f y Flow 1NoYesNo Flow 1 on f x Flow 2 on f x Flow 1Flow 1 on f x Flow 2 on f x Flow 2N/ANo Flow 1 on f x Flow 2 on f x Flow 1Flow 1 on f y Flow 2 on f x Flow 2N/ANoYes Flow 1 on f x Flow 2 on f x Flow 1Flow 1 on f x Flow 2 on f y Flow 2N/AYes Observation: Hybrid Registration is as good or better than frequency based registration in likely idle handoff scenarios

5. C23-BCMCAHG-20031014-xxx 5 Recommendation Adopt proposed Hybrid Registration procedures for BCMCS