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Fix for Overhead Message Bug in Motorola Release A

This document addresses a critical bug in Motorola's Release A, specifically involving missing fields in overhead messages. In the original Release A, important Transmit Diversity (TD) and 3X-related information were included in the Extended CDMA Channel List Message (ECCLM) and MC-RR Parameters Message (MCRRPM). Due to omissions in the TD fields, the feature is currently broken. The fix requires the addition of BCCH code rates and other parameters to ensure proper functionality, as the current implementation limits the TD inclusion flag, potentially leaving critical features unused.

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Fix for Overhead Message Bug in Motorola Release A

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  1. Motorola Ballot Comment #10 • Addresses a bug in the Release A standard – 3 fields omitted from an overhead message • In original Release A, TD & 3X related information was added to overhead messages: • Transmit Diversity (TD) fields were included in Extended CDMA Channel List Message (ECCLM) • 3X fields were included in MC-RR Parameters Message (MCRRPM). • information sent on the BCCH only (not PCH) • Reason for adding the information: • Support channel hashing based on mobile/base capabilities (i.e. after idle handoff) • For TD, some fields were omitted and so the feature is broken (3X is OK).

  2. Frequency Transitions in IS-2000-A ECCLM = Extended CDMA Channel List Message MCRRPM = MC-RR Parameters Message SCHM = Sync Channel Message Arrows indicate allowed transitions: Supported in IS-2000-A Broken in IS-2000-A Note: No direct transitions from PCH (FREQ # 1 or 2) to BCCH, TD, or 3X (FREQ 3,4,5,6,7) are allowed. This is the “Sync Channel Issue” CCLM ECCLM, TD_INCL=0 MCRRPM, 3X_INCL=1 ECCLM, TD_INCL=??? MCRRPM, 3X_INCL=1 ECCLM, TD_INCL=0 MCRRPM, 3X_INCL=0 ECCLM, TD_INCL=0 FREQ # 1 PCH only (IS95/1X) FREQ # 3 BCCH only FREQ # 5 TD only FREQ # 7 3X only 30 or 31 octets 26 octets (IS95), or 28 octets (1X) FREQ # 2 PCH only (IS95/1X) FREQ # 4 BCCH only FREQ # 6 TD only SCHM SCHM SYSTEM DETERMINATION SUBSTATE

  3. Conclusion • BCCH code rate, data rate, and walsh code for TD must be added to BCCH-version of ECCLM • Without this fix, TD_INCL will likely never be set to ‘1’ in the ECCLM, and the fields currently associated with TD_INCL will not be used. The feature is broken. • Unrelated to “Sync Channel Issue”: • Does not help 28-octet problem in any way, since fields not added to PCH-version of ECCLM (a must to resolve the “Sync Channel Issue”). • This feature requires BS to send Release-A (PREV=7) SCHM • This feature can be used to minimize the length of the SCHM to 30 or 31 octets. This is a new application of an existing feature (i.e. not the original intent of the feature).

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