G-GT800 Frequency Planning Analysis Guideline-20041223-A-1.0 Copy

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GT800 Frequency Planning Analysis Guideline Internal

2005-03-29 All rights reserved Page 1 of total 11

Document

number

Product

nameGT800

Applicable

for

Product

version

Prepared byRadio Network

Planning Department

Document

versionV1.0

GT800 Frequency Planning Analysis

Guideline

Prepared

by

RNP Technical Support

DepartmentDate 2004/12/23

Reviewed

byDate

Reviewed

byDate

Approved

byDate

Huawei Technologies Co., Ltd.

All rights reserved


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Table of Contents

GT800 Frequency Planning Analysis Guideline ........................................................................3

1 Digital Trunking Frequency band .............................................................................................3

2 Frequency Planning Patterns and Risk Analysis .......................................................................3

2.1 List of Available Schemes.............................................................................................3

2.2 Analysis of Scheme 1....................................................................................................4








2.10 Summary.......................................................................................................................7

3 GT800 Frequency Planning Diagrams......................................................................................8

3.1 43 BCCH/TCH Frequency Planning...........................................................................8

3.2 Multi-Layer Frequency Reuse Planning (MRP) ...........................................................8

3.2.1 33 TCH Frequency Planning ......................................................................9

3.2.2 11 TCH Frequency Planning ......................................................................9

3.3 6MHz Frequency Planning in China Unicom...............................................................9

3.4 19MHz Frequency Planning in China Mobile ............................................................10

4 Other Relevant Questions .......................................................................................................10


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GT800 Frequency Planning Analysis Guideline

Statement: GT800 Frequency Planning Analysis Guideline presents frequency planning

patterns, frequency planning diagrams and corresponding risks of the GT800 system

under a certain bandwidth in terms of network planning. As an internal technology

clarification, it serves as a reference for Marketing Department and R&D Department to

finally apply for frequency.

1 Digital Trunking Frequency band

Based on relevant documents of the Ministry of Information Industry, the working

frequency band of digital trunking in China is:

Uplink: 806-821MHz

Downlink: 851-866MHz

The GT800 digital trunking system is based on GSM TDMA system and the inter-carrier

distance is 200KHz.

2 Frequency Planning Patterns and Risk Analysis

At present, the Ministry of Information Industry is still responsible for classifying digital

trunking frequency band of 15MHz. The following will present required frequencies and

corresponding planning patterns for various station types.

2.1 List of Available Schemes

Table 1 One-to-one relationship between BTS station type and frequency planning pattern

Scheme Dominant

station

type

Minimum

frequency

required

BCCH

frequency

reuse pattern

TCH

frequency

reuse pattern

Remarks

1 S1/1/1 2.4MHz 43 (2.4MHz) NoneNot recommended

due to great risks

2 S1/1/1 3MHz 43 (2.4MHz) None

Can be used at initial

stages after the

network is

established

3 S2/1/1 3.2MHz 43 (2.4MHz) 33

Can be used at initial

stages after the

network is

established


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4 S2/2/1 4MHz 43 (2.4MHz) 33

Can be used when

the network is

established for a

period of time and for

a long time

5 S2/2/2 4MHz 43 (2.4MHz)

11

frequency

hopping

Take great risks and

can be used when

the network is

established for a


a long time

6 S2/2/2 5MHz 43 (2.4MHz) 43

Can be used when

the network is

established for a


a long time

7 S3/2/2 5MHz 43 (2.4MHz) 33

Can be used when

the network is

established for a


a long time

8 S3/3/3 5MHz 43 (2.4MHz)

11

frequency

hopping

Take great risks and

can be used whenthe network is

established for a


a long time

2.2 Analysis of Scheme 1

Apply for 2.4MHz frequency band and adopt 43 frequency reuse pattern on BCCH for

the dominant S1/1/1 in urban areas. This scheme is not recommended because it cannot

realize traffic absorption on hot spots in urban areas.


Apply for 3MHz frequency band and adopt 43 frequency reuse pattern on BCCH for the

dominant S1/1/1 in urban areas. In this scheme, 2-carrier configuration can be realized on

local hot spots by adding carriers. But continuous coverage is unavailable by S2/1/1 in

urban areas.


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Apply for 3.4MHz frequency band and adopt 43 frequency reuse pattern on BCCH and

TCH for the dominant S2/1/1 in urban areas. In this scheme, continuous coverage is

unavailable in S2/2/1 in urban areas.


Apply for 3.4MHz frequency band and adopt 43 frequency reuse pattern on BCCH and

33 frequency reuse pattern on TCH for the dominant S2/2/1 in urban areas. In this

scheme, 2-carrier configuration can be realized on local hot spots by adding carriers. But

continuous coverage is unavailable by S2/2/1 in urban areas.


Apply for 4MHz frequency band, support S2/2/2 configuration in the whole network, and

adopt 43 and 11 frequency hopping on BCCH and TCH respectively.

This scheme takes great risks due to the following causes:

(1) The frequency reuse reaches its utmost based on the theory of frequency reuse. In

addition, speech quality will be seriously worsened because cellular distribution is

unavailable for BTS sits in the actual network.

(2) Adopting the half rate and 11 aggressive frequency reuse pattern simultaneously will

greatly affect speech quality. In addition, Huawei has no experience for what on earth

speech quality users can stand.

(3) China Unicom adopts 6M frequency band, and 43 frequency reuse pattern on BCCH

and 11 or 13 pattern on TCH. Therefore, speech quality in dense urban areas is worse

in the case of full rate.

However, this scheme also has the following advantages:

(1) BTS capacity increases by 10%, compared with the dominant station type S2/1/1 in

scheme 4.

(2) S2/2/2 configuration will not occur to the whole network at initial stages after the


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network is established. Experience from GSM network planning at initial stages shows:

there are few BTSs at initial stages, BTSs in urban areas are densely distributed and

those in rural areas are sparsely distributed.


Apply for 5MHz frequency band and adopt 43 frequency reuse pattern on BCCH and

TCH for the dominant S2/2/2 in urban areas. In this scheme, continuous coverage can be

locally realized by S3/2/2. Without great risks, this scheme can be used to increase

network capacity through long-term network planning/optimization and proper capacity

expansion. There are few differences between schemes 6 and 7.


Apply for 5MHz frequency band and adopt 43 frequency reuse pattern on BCCH and

33 pattern on TCH for the dominant S3/2/2 in urban areas. In this scheme, continuous

coverage cannot be realized by S3/3/2 on a large scale. It takes low risks and the network

quality can be controlled. There are few differences between schemes 6 and 7.


Apply for 5MHz frequency band, support S3/3/3 configuration in the whole network, and

adopt 43 on BCCH and 11 on TCH with frequency hopping.

This scheme takes great risks due to the following causes:

(1) The frequency reuse reaches its utmost based on the theory of frequency reuse. In

addition, speech quality will be seriously worsened because cellular distribution is

unavailable for BTS sits in the actual network.

(2) Adopting the half rate and 11 aggressive frequency reuse pattern simultaneously will

greatly affect speech quality. In addition, Huawei has no experience for what on earth

speech quality users can stand.

(3) China Unicom adopts 6M frequency band, and adopts 43 frequency reuse pattern

on BCCH and 11 or 13 pattern on TCH. Therefore, speech quality in dense urban areas

is relatively worse in the case of full rate.


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However, this scheme also has the following advantages:

(1) Excluding the decrease in actual capacity caused by interference, the capacity per

BTS can increase by 20%, compared with the dominant S3/2/2 in scheme 7.

(2) S3/3/3 configuration will not occur to the whole network at initial stages after the

network is established. Experience from GSM network planning at initial stages shows:

there are few BTSs at initial stages; BTSs in urban areas are densely distributed and

those in rural areas are sparsely distributed.

2.10 Summary

What schemes 6, 7 and 8 applied for are all 5MHz frequency band. But their differences

lie in frequency planning and corresponding dominant station type. In terms of risks,

scheme 6 is the safest. Scheme 8 takes greater risks than scheme 7. Frequencies of

5MHz can ensure S2/2/2 configuration in the whole network and even support S3/3/3

configuration under certain conditions. In addition, it is flexble to balance network quality

and capacity. If GOTA applies for 3-carrier configuration, it is completely possible to apply

for frequencies of 5MHz. In this sense, it is recommended to introduce 5MHz frequency

band distribution into GT800 system if conditions permit.

What schemes 4 and 5 applied for are both 4MHz frequency band. But their differences lie

in frequency planning and corresponding dominant station type. 4MHz frequency band

can basically realize S2/2/2 in the whole network. However, adopting 1*1 frequency

hopping to realize S2/2/2 on a large scale in urban areas will decrease speech quality.

What schemes 1, 2 and 3 applied for are about 3MHz frequency band. In scheme 1,

2.4Hz frequency band is theoretical and has no operability. 3MHz frequency band can

satisfy coverage at initial stages of network construction but still has a certain difficulty in

resolving capacity of local hot spots. Therefore, 3MHz frequency band is the minimum

frequency band to ensure GT800 network construction if it is very difficult to apply for

frequency bands at initial stages.


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3 GT800 Frequency Planning Diagrams

3.1 43 BCCH/TCH Frequency Planning

The GSM TDMA system adopts the basic 43 frequency reuse pattern. 4 stands for

four sites and 3 indicates there are three cells in each site. Twelve cells are called

frequency family. There are different cells in the same family and their frequency is

different. Figure 1 presents a cell family of 43 frequency reuse pattern.

Figure 1 BCCH/TCH 43 frequency reuse diagram

A1 B1 C1 D1 A2 B2 C2 D2 A3 B3 C3 D3 Reserved

BCCH 1 2 3 4 5 6 7 8 9 10 11 12

TCH1 14 15 16 17 18 19 20 21 22 23 24 2513

5MHz: maximum station type S2/2/2

3.2 Multi-Layer Frequency Reuse Planning (MRP)

Figure 2 Multi-layer Frequency Reuse Diagram


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BCCH adopts 43 frequency reuse pattern and TCH adopts 33, 11 and 13 patterns.

As shown in Figure 2, one color stands for one group of frequencies that are reused. The

size of the circle stands for coverage range. L1, L2, , Lm stands for frequency hierarchy

in a cell. The above figure also shows: the higher the layer is, the more aggressive the

reuse is. Under a certain frequency, multi-layer aggressive reuse can greatly increase

channels per unit area and further increase network capacity, compared with identical

reuse in each layer.

3.2.1 33 TCH Frequency Planning

A1 B1 C1 A2 B2 C2 A3 B3 C3 Reserved

BCCH Adopt 43

TCH1 14 15 16 17 18 19 20 21 22

TCH2 23 24 25

13

5MHz: maximum station typeS3/2/2

4MHz: maximum station typeS2/2/1

3.2.2 11 TCH Frequency Planning

4MHz: maximum station type: S2/2/2

A1 B1 C1 D1 A2 B2 C2 D2 A3 B3 C3 D3

BCCH 1 2 3 4 5 6 7 8 9 10 11 12

TCH1 14 15 16 17 18 19 20

(There are 7 frequency hopping points and frequency point 13 is between BCCH

layer and TCH layer.)

5MHz: maximum station type: S3/3/3

A1 B1 C1 D1 A2 B2 C2 D2 A3 B3 C3 D3

BCCH 1 2 3 4 5 6 7 8 9 10 11 12

TCH1

TCH2

14 15 16 17 18 19 20 21 22 23 24 25

(There are 12 frequency hopping points and frequency point 13 is between

BCCH layer and TCH layer.)

3.3 6MHz Frequency Planning in China Unicom

6MHz: dominant station type: S3/3/3 (maximum station type S4/3/3)


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A1 B1 C1 D1 A2 B2 C2 D2 A3 B3 C3 D3 Reserved

BCCH 1 2 3 4 5 6 7 8 9 10 11 12 13 14

TCH1

TCH2

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

(There are 14 frequency hopping points and frequency point 15 is betweenBCCH layer and TCH layer.)

3.4 19MHz Frequency Planning in China Mobile

China Mobile is rich in frequency resources and can select different frequency plan.

However, multi-layer frequency planning is adopted on BCCH and TCH. The main

planning pattern is as follows:

BCCH: adopt 43, 63, or 73 frequency reuse pattern and reserve several frequency

points

TCH: adopt MRP or 13 frequency hopping, or random distribution

Maximum station type: S8/8/8

4 Other Relevant Questions

1. All frequency points applied are available and applied frequency bands should be

continuous. Discontinuous frequency points will go against frequency planning. In addition,

since each frequency point should be spaced with 200K frequency, the total bandwidth of

discontinuous frequency points must be greater than that of continuous frequency band,

thereby resulting in frequency waste.

2. In schemes 5 and 8, the BTS and terminal must support RF frequency hopping.

3. GT800 adopts directional BTS to control interference and increase coverage with

aggressive frequency reuse in urban areas. It can adopt omni-directional BTS in suburban

areas and remote areas, depending on actual situations.

4. In such services as trunking group call, to ensure all group call users can hear a group

call, some means to control interference cannot be used in the GSM system, including

power control and DTX.

5. In the GT800 system, speech service and data service have the same bearer.

Therefore, it is possible to simultaneously improve speech and data services by assigning


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a certain frequency and performing excellent frequency planning to make system C/I meet

a certain requirements. C/I in the GT800 system should be 9dB, the value to support

CS-1/CS-2 data service.

6. Multi-layer network refers to frequency layering. This network requires establishing

super-high BTS and middle/low BTS to simultaneously satisfy coverage and absorb hot

spot traffic in urban areas. There are several ways to realize multi-layer network.

(a) Reserve 2~3 frequency points for high layer BTSs in urban areas if there are enough

frequency resources. Plan other BTSs based on common frequency reuse pattern.

(b) Adopt the multi-layer frequency reuse pattern (MRP) and combine the concentric circle

with corresponding channel assignment algorithm. Make use of the difference of BCCH

and TCH combiner loss so that users near the BTS occupy TCH carrier and ones far away

the BTS occupy BCCH carrier. Doing so can simultaneously satisfy coverage and capacity

demands.

Actually, actual network construction experience from China Mobile and China Unicom

shows: (a) is usually not adopted to establish a multi-layer network on the same frequency

band (such as 900M frequency band). The reason is that reserving frequency points will

result in very low frequency point reuse efficiency and waste followed.

Documents

G-GT800 Frequency Planning Analysis Guideline-20041223-A-1.0 Copy