SD Blocking Improvement

How to Improve SD Blocking???

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Ericsson Internal | 2011-01-25 | Ruchika Singh

SDCCH USED IN

› Location Update› SMS› Periodic registration› Call Set up› IMSI attached/detached› False Access due to radio disturbance/SD TS not working

properly› Fax set-up and Supplementary Services › Abnormal SD Congestion in G-10 BSC


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1 -Wrong Parameter setting

ACLC Feature (SLEVEL, STIME , ACSTATE )

Immediate assignment on TCH(CHAP)

Higher value of T3212 Counter Value

2 - Wrong SD Dimensioning

SD Dimensioning should be based on .5 % GOS Traffic.

Correct SDCCH configuration ( SDCCH/4 , SDCCH/8)

SD Blocking Reasons


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› Activate ACLC Feature –

(Adaptive configuration of logical Channels)

ACSTATE – ON

SLEVEL –

SLEVEL defines the level of remaining sub channels when an attempt to reconfigure a TCH to an SDCCH/8 will take place. Command RLACC, set per cell.( Value range – (0,1,2,

CONG ).

STIME –

STIME defines the minimum time interval before an SDCCH/8 added by the Adaptive configuration of logical channels feature can be reconfigured back to a TCH. Command RLACC, set per cell. ( Value Range - 15-360 )

Wrong Parameter setting


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TCH to SD SD to TCH

Is idle SDCCH< SLEVEL

Is idle TCHs > 4 or is idle TCHs > TRXs in the cell

Is SDCCH/8 < maxallowed SDCCH/8in the cell

Reconfigure TCHto SDCCH/8

Start

Start

Is SDCCH/8 > basicconfiguration?

Initiate leaky bucketcounter = STIME

Is idle SDCCH sub-channels > 8 + SLEVEL?

Decrease leaky bucketcounter with 3

Reconfigure SDCCH/8 to TCH

Is idle SDCCH sub-channels < 8 + SLEVEL?

Set leaky bucketcounter to STIME

Is the leaky bucket counter 0?

No

NoNo

Yes

Yes

Yes

No

No

YesNo

No

Yes


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Wrong Parameter setting

Immediate assignment on TCH should be ONImmediate assignment allow to use a TCH channel for signalling

If congestion on the SDCCH occur the cell may not accept any new calls to be setup even if there is spare capacity on the Traffic Channels (TCHs) depending on if the Immediate assignment on TCH feature is enabled or not. TCH for signalling is undesirable unless for short durations of unpredictable traffic peaks.

CHAP = 1 or 6:TCH last (SDCCH first)(For CHAP detail please see attached word document)

CHAP


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Improvement

Parameter setting before:ACLC – OFFSLEVEL-0Immediate assignment –OFF

Parameter Setting after :ACLC- ONSLEVEL-2Immediate assignment- ON


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Wrong SD Dimensioning

Automatic SDCCH Dimensioning (Basic configuration used in Network)

BCCHTYPE Value will decide which SD configuration will be use in Our Network.

Use SDDCH/4 – if Location Area < 2100 Erl Use SDDCH/8 – if Location Area > 2100 ErlIts is preferred to use SDCCH/8 (mean 8 Sub time slot of SD will be available in 1 TS)

Manual SDCCH Dimensioning –

Although it is recommended to make use of the Adaptive Configuration of Logical Channel it is still possible to configure the SDCCH manually .SD Dimensioning should be based on .5 % GOS.

SD Dimensioning tool is attached for Proper SD Dimensioning based on SD Utilization ,CCONG , CNRELCONG & Guideline provided by Customer

SD Dimensioning Tool


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Wrong SD Dimensioning

Some important Point –BSC Boundary should be cut in a proper way

For Highway (HW) – Boundary - BSC Boundary should cut H/W route

For Railway Route (RR) – Boundary – BSC Boundary should be Parallel to RR

H/W

BSC Boundary


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N/W SD Blocking Improved

0.00

0.20

0.40

0.60

0.80

1.00

1.20

July (CBS) Aug (CBS) Sep (CBS) OCT (CBS) NOV (CBS) DEC (CBS)

SC SD Blocking NS SD Blocking

Dusshera Festival in OCT &

Diwali Festival in NOV


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Apart from Above solutions Please implement MC-A46 patch for all G-10 BSCs. This patch will reduce abnormal SD Congestion.

G-10 Patch

SD Blocking Improvement

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