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B8 MR7&B9 feature: MultibandCell Secured TCH Assignment
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06
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AlgorithmsNormal assignment (1/6)
SDCCH channels are in the outer zone
Allocation of a TCH in the outer zone or in the inner zoneaccording to the MS location
Cause 13 (outer zone to inner zone HO cause) is checkedin order to determine the MS location
Single band MS : 900 SDCCH and TCH
Dual band MS : 900 SDCCH and TCHDual band MS : 900 SDCCH and 1800 TCH
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06
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AlgorithmsNormal assignment (2/6)
The flag EN_BETTER_ZONE_HO is not taken into account
Average level : if more than A_LEV_HO measurements have been received,
AV_RXLEV_UL/DL is used
if less than A_LEV_HO measurements have been received, theaverage of these measurements is used
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06
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AlgorithmsNormal assignment (3/6)
MS measurements & BSS parameters might reflect toooptimistic appreciation of inner zone coverage
Too many assignment failures in inner zone
Since B8 MR7,³Multiband cell secured TCH assignment´ feature introduction
TCH assignments performed in inner zone are secured by asubsequent TCH assignment in outer zone.
TCH assignment failure in inner zone is followed by a TCH assignmentattempt in outer zone.
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AlgorithmsNormal assignment (4/6)
Multiband cell secured TCH assignment feature:
Improvements
RTCH Assignment failure rate is reduced
CSSR is increased
Drawbacks
RTCH Assignment failure BSS rate is slightly increased due to wrongcounter implementation
Congestion may appear in outer zone
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06
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RTCH_assign_fail_radio = MC746b
incremented when a failure in inner zone is followed
by subsequent failure in outer zone
not incremented when failure in inner zone is
followed by success in outer zone
RTCH_assign_fail_radio_rate is decreased
RTCH_assign_fail_BSS = MC140b-MC718-MC746b
commands ± success - radio
MC140b is incremented twice
RTCH_assign_fail_BSS_rate is increased
no impact on subscriber
Global RTCH_assign_fail_rate is decreased
CSSR is increased
AlgorithmsNormal assignment (6/6)
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