Huawei GBSC Traffic Capability Clarification

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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www.huawei.com

Huawei GBSC traffic volume specification

Feb, 2011


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Contents

1 GBSS8.1 BSC6000 Product Description

2 Clarification of GBSC traffic volume

3 Analyse of test result

5 Notes

6 Advice





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GBSS8.1 BSC6000 Product DescriptionGBSS8.1 BSC6000 Product Description

GBSC’s traffic capability includes two factor: traffic volume (Erl) GBSC’s traffic capability includes two factor: traffic volume (Erl) 13000, and BHCA 3500K.13000, and BHCA 3500K.





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Clarification of GBSC’s Traffic Capability (1)Clarification of GBSC’s Traffic Capability (1)

Max Traffic volume (Erl) 13000ErlMax BHCA 3500K

Max TRXs 2048

Max Cells 2048

Max Sites 2048

Max Abis E1 640

Max A CIC 15360

Max Traffic Capability:Max Traffic Capability:

Max Device Max Device Configuration:Configuration: Traffic Profile(Typic):Traffic Profile(Typic):

Profile value

Traffic volume per subscriber busy hours 0.02000

Mean time of a call 60.000

Number of location updates per subscriber in busy hours 1.200

Number of originated calls per subscriber in busy hours 0.600

Busy-hour called times per subscriber 0.600

Busy-hour sending SMS times per subscriber 0.300

Busy-hour receiving SMS times per subscriber 0.500

Average retransmissions for paging 0.385

Intra-BSC handover 1.080

Inter-BSC handover 0.120

GBSC Traffic Capability:GBSC Traffic Capability:

1.1. Traffic volume(Erl) is affected directly by Traffic volume(Erl) is affected directly by load of BSC’s user plane, BHCA is affected load of BSC’s user plane, BHCA is affected directly by load of signal plane.directly by load of signal plane.

2.2. If either Erl or BHCA is up to maximum, the If either Erl or BHCA is up to maximum, the BSC will reach the max capability, and the BSC will reach the max capability, and the CPU ratio reach the 80% threshold.CPU ratio reach the 80% threshold.

OR





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Formula of Traffic Volume(Erl):Formula of Traffic Volume(Erl):

Formula 1:Traffic Volume(Erl) = N* [Traffic volume per subscriber]

Formula2:Traffic Volume(Erl) = N*(n_call*T)/H N -- [subscriber amount] n_call -- call times per subscriber in busy hours. n_call = [Number of originated calls per subscriber] + [called times per subscriber] T -- [Mean time of a call] H -- period of statistic, 3600 second.





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Formula of BHCA(Busy Hour Call Attempt):Formula of BHCA(Busy Hour Call Attempt):

n_call -- call times per subscriber in busy hours. n_call = [Number of originated calls per subscriber] + [called times per subscriber] n_upd -- [Number of location updates per subscriber in busy hours]n_sms -- sms times per subscriber in busy hours. n_sms = [Busy-hour sending SMS times per subscriber] + [Busy-hour receiving SMS times per subscriber] n_page-- paging times at A inerface in busy hours. n_page = N* ([called times per subscriber] + [Busy-hour receiving SMS times per subscriber] + [Average retransmissions for paging]) n_ho -- hand over times per subscriber in busy hours. n_ho = [Intra-BSC handover] + [Inter-BSC handover] N -- [subscriber amount]Nc -- max cell number in one LAC. Nc=cell amount/lac amounta -- BHCA quota of CALL service = 1b -- BHCA quota of LOCATION UPDATES service = 0.5c -- BHCA quota of SMS service = 0.6d -- BHCA quota of paging = 0.01e -- BHCA quota of handover = 0.5

BHCA = a*N*n_call + b*N* n_upd + c*N*n_sms + d*Nc*n_page + e*N*n_ho BHCA_call BHCA_upd BHCA_sms BHCA_page BHCA_handover





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1.1. Service of SMS/PAGING/LOCATION UPDATE/HAND OVER can only present by Service of SMS/PAGING/LOCATION UPDATE/HAND OVER can only present by BHCA, not present in Erl.BHCA, not present in Erl.

2.2. Only BHCA_call has ralation with Erl.Only BHCA_call has ralation with Erl.3.3. Traffic volume(Erl) is affected directly by load of BSC’s user plane, BHCA is Traffic volume(Erl) is affected directly by load of BSC’s user plane, BHCA is

affected directly by load of signal plane. These two factor present integrallty affected directly by load of signal plane. These two factor present integrallty Load of GBSC.Load of GBSC.

n_call n_upd belong this trafic

BHCA = a*N*n_call + b*N* n_upd + c*N*n_sms + d*Nc*n_page + e*N*n_ho BHCA_call BHCA_upd BHCA_sms BHCA_page

Traffic Volume(Erl) = N*(n_call*T)/H

Relationship of Erl and BHCA:Relationship of Erl and BHCA:

BHCA_handover





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Analyse of test resultAnalyse of test result

Traffic Volume(Erl) = BHCA_call*T/H

BHCA_call -- call times in busy hours. T -- [Mean time of a call] H -- period of statistic, 3600 second.





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NotesNotes

1.1. The announced GBSC traffic capability includes BHCA(3500K) and traffic The announced GBSC traffic capability includes BHCA(3500K) and traffic volume(13000Erl). The BSC will reachs the max capability if either BHCA or volume(13000Erl). The BSC will reachs the max capability if either BHCA or Erl is up to maxinum.Erl is up to maxinum.

2.2. By test result from the profiles given by XX Customer,HUAWEI GBSC By test result from the profiles given by XX Customer,HUAWEI GBSC supports the announced BHCA/Erl capability. The BHCA will reachs the supports the announced BHCA/Erl capability. The BHCA will reachs the maxinum capability first in XX Customer’s profile cause of the high load of maxinum capability first in XX Customer’s profile cause of the high load of SMS service.SMS service.

3.3. HUAWEI GBSC can insure reliability in overload traffic mode by it’s load HUAWEI GBSC can insure reliability in overload traffic mode by it’s load sharing and overload mechanism.sharing and overload mechanism.





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AdvicesAdvices

1_ Switch off SDDCH hand over. This parameter was OFF by default There is no value to open it unless authentication and encryption is using.

2_ Find the value of “"Maximum subscriber per BSC“ to help to calculate traffic volume and BHCA exactly.

3_ Adjust busy and idle CELL to assigned on CPUx balanced. 4_ If the BSC6000 is configured with 2 or more LAC, the cells with same

LAC are suggested to configure in the same subrack to reduce the internal processing.

5_ Some operation such as CHR tracing, massage tracing and dynamic data configuration will increase CPU usage momentary.

Thank youwww.huawei.com

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential

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Huawei GBSC Traffic Capability Clarification

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