cobcch trial discussion-20110217

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23/4/10

CoBCCH S14/14/14 TrialFor XL

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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Five 900M sites and five 1800M sites in core area

Nine(seven) 900M sites and nine 1800M sites in buffer area

Most of the sites’ configuration is S444

The site list

Trial Area





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1. BTS3900 Swap

2. Implementing Frequency Planning in 900M

3. Implementing Frequency Planning in 1800M

4. Change Dual Band to CoBCCH

5. Expansion

6. Performance Optimization

Trial Procedure





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Operation Swap the BTS3012 and BTS312 by BTS 3900 Changing the configuration of north interface in the M2000

BTS swap

NEs Current Version Upgrade Version

BTS

BTS3012 ：BTS3000V100R001C07BTS312 ：G3BTS32V302R007C02

BTS3900 ：

BTS3000V100R009C00





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Frequency planning in Trial Region

Existing Frequency Plan - GSM900 + DCS1800

Band Current planning

900 18 BCCH and 18 TCH

BCCH:107~124 TCH:88~105


BCCH:512~529 TCH:531~548





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Frequency planning in Trial RegionProposed Frequency Plan – CoBCCH

Band Re-planning


BCCH:110~124 TCH:88~108

1800 core area: 0 BCCH and 36 TCH , TCH:513~548

buffer area:0 BCCH and 18 TCH , TCH:531~548





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Change Dual Band to CoBCCH

Operation:

In the core and buffer area, all co-sites are changed to CoBCCH

Setting the algorithms parameter of CoBCCH cells

Configuring the BCCH/SD/PD on the underlay subcell

parameter





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Operation:

Doing the RF Optimization, making 900Mhz and 1800Mhz antennas same azimuth and down-tilt

Adjusting the neighbor cells

Impacts and Risk Some KPI will get worse because of CoBCCH

feature and the scenario, such as HO success rate, TCH ass success rate and Call drop rate.





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9


GSM900 Underlay

DCS1800Overlay

?

TA, Rx_Lev,

Rx_Qual…..

As good as 900M?

Handover command

Blind Ho/Ass from UL to OL

Risk1: Ho failures

Risk2: Ass failures

Risk3: Call drops





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10

• The commissioning of a CoBCCH cell has strict requirements on scenarios, and the area for commissioning must be urban.

Scenario

Scenario Feature DescriptionRecommend

abilityCommissioning

Results AnalysisCoverage Carriers

Densely populated urban area

Consecutive converge of the overlaid subcell

No special requirement High

1. The results are good.2. The performance is stable.

1. Within the coverage scope of a whole CoBCCH cell, 1800M and 900M carriers have almost equal coverage.2. The parameters should be adjusted so that 1800M carriers can absorb more traffic.

Urban areaInconsecutive converge of the overlaid subcell

Underlaid ≧ overlaid Fairly high

1. The results are good. 2. The performance are controllable after adjustment.

1. The spacing between the stations is a bit large, and within the coverage scope of a whole CoBCCH cell, 1800M carriers can cover above half the 900M areas and absorb the traffic in a majority of the areas.2. 900M has many carriers, which can cover the remaining areas. 900M is less risky of congestion.3. The parameters are adjusted properly so that 1800M can absorb traffic and 900M can ensure coverage.

Urban areaInconsecutive converge of the overlaid subcell

Underlaid < overlaid Middle

1. The results are average.2. The underlaid subcell is severely congested.3. The performance declines.

1. The spacing between the stations is a bit large, and within the coverage scope of a whole CoBCCH cell, 1800M can cover above half the 900M areas and absorb the traffic in a majority of the areas.2. 900M has few carriers, and may be congested in busy hours. 1800M is idle, and the success rate of handover from 900M to 1800M is low, and so is the success rate of utilizing 1800M channels. 3. It is relatively difficult to adjust the parameters.

Suburban/ countryside highway

Small coverage of the overlaid subcell

Underlaid ≧overlaid Middle

1. The results are average.2. The underlaid subcell is severely congested.3. The performance declines

1. The spacing between the stations is too large, and 1800M has so small a coverage that traffic cannot be absorbed effectively.2. 900M may be congested in busy hours, but 1800M is idle, and the success rate of handover from 900M to 1800M is low, and so is the success rate of utilizing 1800M channels. 3. It is relatively difficult to adjust the parameters.

Suburban/ countryside highway

Small coverage of the overlaid subcell

Underlaid < Overlaid Low

1. The results are very bad.2. The underlaid subcell is extremely congested.3. The performance declines severely.

1. The spacing between the stations is too large, and 1800M has so small a coverage that traffic cannot be absorbed effectively.2. 900M has few carrier frequencies, and severe congestion occurs easily. 1800M is idle, and the success rate of handover from 900M to 1800M is low, and so is the success rate of utilizing1800M channels. 3. It is extremely difficult to adjust the parameters.






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ExpansionConfiguration

Remark for S12 In the suburban, the distance between sites is more

than 1.5km, we suggest the combination of S6 and S6 In the urban, the distance between sites is about

1km, we suggest the combination of S4 and S8

900 band S4 S6 S6

1800 band S4 S6 S8

Configuration S8 S12 S14





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Expansion of Underlay

Operation

Adding E1 for the BTS3900

In core area, the configuration of 900M site is from S444 to S666

RF Load = 72% High priority Low priority





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Expansion of Overlay Operation

In core area, the configuration of 1800M site is from S444 to S666, and then expand to S888

Impacts and Risk There is an improvement in the TCH congestion

rate, and other KPI will get worse because of the traffic improvement

RF Load = 67% High priority Low priority





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14

Performance Optimization Monitor the network performance and do the DT Optimizing the parameters of CoBCCH

Two sets of strategies

Three thresholds

Set initial configurations

DT test and traffic analysis

Collect information of the original network,

and evaluate the commissioning result

Optimize and adjustcell by cell

Dynamic adjustment

Assignment

Handover

Assign optimum level

OL<->UL HO received

levels

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cobcch trial discussion-20110217

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