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1xBCMCS – Registration for Paging
Ragulan Sinnarajah QUALCOMM Incorporated
September 15
Notice©2003 QUALCOMM Incorporated. All rights reserved.QUALCOMM Incorporated grants a free, irrevocable license to 3GPP2 and its Organization 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 portions of the contribution; and at the Organization Partner’s sole discretion to permit others to reproduce in whole or in part such contributions or the resulting Organizational Partner’s standards publication. Qualcomm Incorporated 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 Qualcomm Incorporated 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 Qualcomm Incorporated. Qualcomm Incorporated 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 Qualcomm Incorporated other than provided in the copyright statement above.
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Why registration?
• To determine the “vertical” location of the MS– Vertical: Which frequency within a given sector is the MS in– Horizontal location (I.e. which sector is the MS in) is determined through current
registration mechanisms in the standard» Timer-based, Zone-based, Distance-based registrations, etc.» Other BS algorithms
• Why do we need to know which frequency the MS is in?– To page the MS for incoming calls, to deliver MS directed messages, etc.– In current standard the frequency MS resides in is known unambiguously
through hashing algorithm– But with the introduction of BCMCS, MS may reside in a different frequency
than the hash-to-frequency
• Ericsson Registration Bit is used to determine how many mobiles are currently listening to a BCMCS_FLOW_ID in a given sector– For dynamic BCMCS purposes. – Independent of “vertical” BCMCS registration
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Current Proposal
• BCMCS_FLOW_ID based registration
• Timer-based registration of BCMCS_FLOW_IDs– When MS monitors a BCMCS_FLOW_ID, MS informs the BS periodically
through BCMCS Registration Message– Based on the BCMCS_FLOW_ID registered and LPM table, BSC knows which
frequency the MS resides in– Value of timer provides trade-off between number of RL registrations and
number of frequencies the BS must send FL messages in» Timer is not needed if “channel swapping or frequent start/stop” scenarios are not a
concern. In this case, MS simply registers each time start & stop monitoring a BCMCS_FLOW_ID
• BSC passes BCMCS_FLOW_IDs to MSC– When MSC has page for MS, MSC sends page request to one or more BSCs – MSC decides which BSCs to send it to based on current horizontal location
determination algorithms– Each BSC uses the BCMCS_FLOW_IDs provided and the local LPM to decide
where to page
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Alternative Proposal
• Frequency based registration • Register with BS whenever frequency changes
– Whenever MS leaves hash-to-frequency to monitor BCMCS_FLOW_ID, MS sends BCMCS Registration to indicate new frequency
– MS re-registers only when moving to another frequency• A timer may still be required if “ping-pong” between sectors with
different frequency is a concern• BSC passes current frequency to MSC
– When MSC has page for MS, MSC sends page request to one or more BSCs
– MSC decides which BSCs to send it to based on current horizontal location determination algorithms
– Each BSC uses the current frequency provided to decide where to page the MS
• Advantages:– Regardless of how many BCMCS_FLOW_IDs MS monitors, only a
single frequency is registered
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ComparisonBCMCS_FLOW_ID based Frequency Based
When registration occurs? Whenever MS starts/stops monitoring a BCMCS_FLOW_ID
Whenever MS changes frequency to monitor a new BCMCS_FLOW_ID
In which frequency does BS pages the MS?
In the frequency corresponding to the registered BCMCS_FLOW_ID per LPM; if none registered, then in hash-to frequency
In the registered frequency
Impact when MS monitors multiple BCMCS_FLOW_IDs simultaneously?
Each of the BCMCS_FLOW_IDs must be registered
Only single registration since MS can monitor only one frequency at any given time
Re-register when MS switches between two BCMCS_FLOW_IDs?
YES
Ping pong solution: Hysteresis timer
Only if they are on different frequencies
Ping pong solution: Hysteresis timer
Re-register when MS idle HOs between two sectors where channel is transmitted on different frequencies?
NO YES
Ping pong solution: Hysteresis timer
How new BS knows where to page the MS that performed BCMCS registration in old BS?
BCMCS registration from old BS needs to be forwarded to new BS
BCMCS registration from old BS needs to be forwarded to new BS
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Comparison ..BCMCS_FLOW_ID based Frequency Based
BCMCS Registration for authorization? Needed only to start session or when Ericsson bit turned ON
Needed only to start session or when Ericsson bit turned ON
