156378879-04D-GPRS-EDGE-Network-Planning-V1-0(1).pdf

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

HUAWEI Confidential

Security Level:

GPRS/EDGE Network

Planning

V1.0

HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 2

Upon completion of this course, you will be able to:

Understand GPRS/EDGE overall network

planning principles

Master GPRS/EDGE capacity planning

methodology

Master GPRS/EDGE coverage, parameter

planning principle


Chapter 1 Overall Network Planning Principle

Chapter 2 Traffic Model

Chapter 3 Capacity Planning (Um, Abis, Pb, Gb)

Chapter 4 Coverage Planning

Chapter 5 Frequency Planning

Chapter 6 Signaling Channel Planning

Chapter 7 Parameter Planning

Chapter 8 GPRS in Dual Band Network and

Network Performance Indication


GPRS Overall Network Planning Principle

Promote balance development of voice service and data

service

Fully utilize the existing GSM network resources

Satisfy GPRS/EDGE network requirements while assure GSM

network quality

The general principles of GPRS/EDGE network

planning principles are as follows:


Result in additional interference

Load of signaling changes

Radio resource usage becomes more complex

Traffic model changes and network planning strategy

should be adjusted

If a GPRS/EDGE network is introduced, it will bring the

following effects against the existing GSM network:

GPRS Overall Network Planning Principle


Traffic Model

Currently, the GPRS/EDGE network in China enables the

following services:

Mobile phone and laptop online

WAP over GPRS/EDGE

Terminal installation-based services

Personal data assistant (PDA) terminal access

Short message over GPRS/EDGE

Private line access

Private network access


Data Transmission Protocol Platform

Application Application

IP/X25 IP/X25 IP/X25

SNDCP GTP

LLC LLC UDP/TCP UDP/TCP

RLC RLC (BSSGP) (BSSGP) IP IP

MAC MAC Frame

relay

Frame

relay L2 L2

L2 (MAC)

Physical

Layer

Physical

Layer

Physical

Layer

Physical

Layer

Physical

Layer

Physical

Layer

Physical

Layer

MS BSS SGSN GGSN

relay

relay

SNDCP GTP

Um Gb Gn Gi

V_IP VGb


Transmission principle of data packet on Um interface

IP data package

Subscriber data RLC/MAC head LLC head SNDCP head LLC FCS

SNDCP PDU

LLC PDU

RLC/MAC block

Normal burst Normal burst Normal burst Normal burst Physical layer


Traffic Model

Data Input:


Traffic Model

A1 = (IP + H1) * N

A2 = IP * N

M =A1 / B

T = (M MR2MR1) 20ms

V_IP = A2 / T

VGb = V_IP * (IP + H2) / IP

Calculation

Here: A1 is the total bytes of the N*LLC PDUs.

A2 is the total bytes of the N*IP packets.

M is the minimum number of RLC data blocks needed for the transfer of N*LLC PDUs.

B is the LLC PDU bytes that a RLC data block can bear.

T is the time needed for the transfer of N*LLC PDUs.

V_IP is the bearer rate of each PDCH estimated across the IP layer.

VGb is the bearer rate of each PDCH estimated across the Gb interface physical layer.

X indicates that X must be rounded up to the nearest integer.

X indicates that X must be rounded down to the nearest integer.


Traffic Model

A1 = (IP + H1) * N = (320+17)*10 3370 Bytes

A2 = IP * N = 320*10 = 3200 Bytes

M = A1/B= 3370 / 30 113 blocks

T = (M +M*R2+M*R1)*20ms

= 113+113*20%+113*10%)*20ms

= 2920ms = 2.92s

V_IP = A2/T = (320 * 10 * 8) / 2.92 / 1024 8.56 Kbps

VGb = V_IP * (IP + H2) / IP

= 8.56*(320+53)/320=9.98Kbps

Based on the previous assumptions, facts, and calculation models,

the transmission rate estimated using CS2 can be calculated as

follows:


Traffic Model

Bearer Rate CS-1

(Kbps)

CS-2

(Kbps)

CS-3

(Kbps)

CS-4

(Kbps)

Um interface rate

at physical layer 9.05 13.4 15.6 21.4

Rate at IP layer

in Um interface 5.73 8.56 10.3 14.4

Abis interface

rate at physical

layer

16 16 32 32

Gb interface rate

at physical layer 6.68 9.98 12.01 16.79


Traffic Model GPRS/EDGE and GSM shares the CCCH signaling channel. If the

network uses PCCCH access, the channel planning, parameter

planning, and dual-band network load strategies need to be adjusted

greatly during network planning.

The accurate estimation for GPRS/EDGE traffic model is unpractical.

The GPRS/EDGE traffic model cannot be described simply according

to the Erlang of each subscriber, which is the basis of traffic model for

voice service.

GPRS/EDGE traffic model deserves long-term attention. As the

GPRS/EDGE service develops, the analysis and modification for

GPRS/EDGE traffic model must be made accordingly, which makes the

adjustment of the methods and strategies for GPRS/EDGE network

planning possible. In addition, the introduction of new services may risk

an abrupt change of the GPRS/EDGE traffic model.


Traffic Model

Subscriber model

total volume of data service, ratio of different services,

distribution of service in terms of time, distribution of

service in terms of space

Radio transmission model

CS distribution, signaling overhead

Service model

packet length and packet gap distribution of single

service

The following contents are closely related to

GPRS/EDGE traffic model:


Capacity Planning

To configure proper PDCH channels, Pb, Gb and Abis

interface resource to serve a certain quantity of

GPRS/EDGE subscriber.


Count Average Rate at IP Layer of PDCH

GPRS Capacity Budget Flow

Begin

Count GPRS Channel Bandwidth

Count GPRS Service Busy Hour

Traffic Volume per Subscriber (Erl)

Count Cell Maximum Subscriber Quantity

End

Count Static/Dynamic PDCH


Capacity Planning

1) Data Input:

Code Scheme

Rate at IP Layer

Ratio Abis Idle Circuit

CS1 5.73 20% 0

CS2 8.56 80% 0

CS3 10.33 0% 1

CS4 14.37 0% 1

Average Rate at IP Layer

8.00


Capacity Planning

2) Data Input:

GPRS Channel Bandwidth = Rate at IP Layer (kbps)/PDCH Channel Multiplex Count

Voice Service GOS 2%

Voice Service Busy Hour Traffic Volume per Subscriber (Erl) 0.025

GPRS User Penetration 10%

GPRS Busy Hour Required Bandwidth per Subscriber (bps) 144

Rate at IP Layer (kbps) 8.00

GPRS Service Peak-to-average Force Ratio 25%

GPRS Service GOS 2%

GPRS Busy Hour Required Bandwidth per Subscriber Considering Peak-to-average Force Ratio (bps)

180

PDCH Channel Occupied by Each Connection of GPRS Service 0.125

Each "GPRS Channel" Bandwidth (kbps) 1.00

GPRS Service Busy Hour Traffic Volume per Subscriber (Erl) 0.18

PDCH Channel Multiplex Count 8


Capacity Planning

Data Output:

PDCH Calculation:

GPRS Channel Quantity = ERLANG-B(GPRS Service Traffic VolumeGOS)

PDCH = "GPRS Channel" Quantity* Each "GPRS Channel" Bandwidth (kbps)/

Rate at IP Layer (kbps)

Cell TRX

Quantity

Available

TCH/PDCH Count

Cell Maximum Subscribe

r Quantity

Cell Voice Service Traffic VolumeErl

TCH Quantity

GPRS

Service

Traffic

Volume

Erl

"GPRS Channel" Quantity

PDCH Quantity

Static PDCH

Static PDCH

Dynamic PDCH

1 7 116 2.91 7 2.05 5.70 0.71 0 0 1

2 14 295 7.38 13 5.19 10.20 1.28 1 1 1

3 22 557 13.93 21 9.80 16.00 2.00 1 1 1

4 29 801 20.04 28 14.09 21.10 2.64 1 1 2


Capacity Planning

Pb Interface is related to PDCH quantity and configuration

Gb Interface is related to total throughput

Abis Interface is required to be configured enough idle time-slots

to support high rate of code scheme

PbGbAbis Interface Calculation


Example

Total static PDCH: (1024*8)*5% = 410, total dynamic PDCH: 410

Active PDCH: 410+410*50%=615

In Pb interface

Minimum number of RPPU = 615/120 6 pcs

Number of RPPU actually configured = 6+2 = 8 pcs (N+2 backup, N>4)

One E1 can support 60 packet channels (CS4)

Number of Pb interface E1s = 615/60+2*2 15 pcs

In Gb interface

Gb interface rate at physical layer (VGb) = 1.166*V_IP = 9.328 Kbps

Minimum number of RPPU = 615*9.328Kbps/(8Mbps*70%) 2 pcs

Number of RPPU actually configured = 2+1 = 3 pcs (N+1 backup)

One E1 can support about 1.4Mbps data rate (2Mbps70%1. 4Mbps)

Number of Gb interface E1s = 615*9.328Kbps/1.4Mbps + 4 5+4 = 9 pcs

Suppose PCU connect to one BSC which contains 1024 carriers.

Static PDCH are 5% of all the channels and dynamic PDCH are 5%

of all the channels, dynamic PDCH activation ratio is 50%, V_IP is

8kbps and VGb is 1.166*V_IP.


Coverage Planning

EIRP (Equivalent Isotropic Radiated Power) is the same.

The loss from transmission end to reception end is the same except body

loss.

GPRS/EDGE service is restricted by C/I (carrier-to-interference ratio)

instead of receiver sensitivity.

When CS1 is used, the C/I is required to be higher than 9 dB (for voice

service, the C/I is 9 dB). If PDCHs are configured on BCCH carrier, the C/I

can meet the requirement.

Compared with GSM coverage, the GPRS/EDGE

coverage has the following features:

CS-3 coverage area

CS-4 coverage area

CS-2 coverage area

CS-1 coverage area


Coverage Planning

For the relationship between the conversation

quality and C/I, see the following table.

rxqual 0 1 2 3 4 5 6 7

C/I[dB] 23 19 17 15 13 11 8 4

BLER must be controlled within 10%.

The coverage area under CS1 equals voice coverage area.

The coverage area under CS2 must reach 80% of the voice

coverage area.


Coverage Planning

GSM 900

Channel Type

Transmission Conditions

Static TU50

(no FH)

TU50

(ideal FH)

RA250

(no FH)

HT100

(no FH)

PDTCH/CS-1 dBm -104 -104 -104 -104 -103

PDTCH/CS-2 dBm -104 -100 -101 -101 -99

PDTCH/CS-3 dBm -104 -98 -99 -98 -96

PDTCH/CS-4 dBm -101 -90 -90 * *

USF/CS-1 dBm -104 -101 -103 -103 -101

USF/CS-2 to 4 dBm -104 -103 -104 -104 -104

PRACH/11 bits dBm -104 -104 -104 -103 -103

PRACH/8 bits dBm -104 -104 -104 -103 -103

For the signal level requirements of various channel types

under GMSK modulation scheme (common BTS) GSM900


Coverage Planning

For the signal level requirements of various channel types

under GMSK modulation scheme (common BTS) DCS1800

DCS 1 800

Channel Type


Static TU50

(no FH)

TU50

(ideal FH)

RA130

(no FH)

HT100

(no FH)

PDTCH/CS-1 dBm -104 -104 -104 -104 -103

PDTCH/CS-2 dBm -104 -100 -100 -101 -99

PDTCH/CS-3 dBm -104 -98 -98 -98 -94

PDTCH/CS-4 dBm -101 -88 -88 * *

USF/CS-1 dBm -104 -103 -103 -103 -101

USF/CS-2 to 4 dBm -104 -104 -104 -104 -103

PRACH/11 bits dBm -104 -104 -104 -103 -103

PRACH/8 bits dBm -104 -104 -104 -103 -103


Coverage Planning

For the signal level requirements of various channel

types under GMSK modulation scheme (MS)

GSM900

Channel Type


Static Tu50

(no FH)

Tu50

(ideal FH)

RA250

(no FH)

HT100

(no FH)

PDTCH/CS-1 dBm -104 -104 -104 -104 -103

PDTCH/CS-2 dBm -104 -100 -101 -101 -99

PDTCH/CS-3 dBm -104 -98 -99 -98 -96

PDTCH/CS-4 dBm -101 -90 -90 * *

USF/CS-1 dBm -104 -101 -103 -103 -101

USF/CS-2 to 4 dBm -104 -103 -104 -104 -104

PRACH/11 bits1) dBm -104 -104 -104 -103 -103

PRACH/8 bits1) dBm -104 -104 -104 -103 -103


Coverage Planning

For the C/I requirements of various channel types under

GMSK modulation scheme, GSM900

GSM 900

Channel Type


TU3

(no FH)

TU3

(ideal FH)

TU50

(no FH)

TU50

(ideal FH)

RA250

(no FH)

PDTCH/CS-1 dBm 13 9 10 9 9

PDTCH/CS-2 dBm 15 13 14 13 13

PDTCH/CS-3 dBm 16 15 16 15 16

PDTCH/CS-4 dBm 21 23 24 24 *

USF/CS-1 dBm 19 10 12 10 10

USF/CS-2 to 4 dBm 18 9 10 9 8

PRACH/11 bits1) dBm 8 8 8 8 10



Coverage Planning

For the C/I requirements of various channel types under

GMSK modulation scheme, DCS1800

DSC1800 MHz

Channel Type


TU1,5

(no FH)

TU1,5

(ideal FH)

TU50

(no FH)

TU50

(ideal FH)

RA130

(no FH)

PDTCH/CS-1 dBm 13 9 9 9 9

PDTCH/CS-2 dBm 15 13 13 13 13

PDTCH/CS-3 dBm 16 15 16 16 16

PDTCH/CS-4 dBm 21 23 27 27 *

USF/CS-1 dBm 19 10 10 10 10

USF/CS-2 to 4 dBm 18 9 9 9 7




Frequency Planning

Frequency planning aims to decide frequency reuse pattern

according to C/I requirement, capacity requirement, and the

available bandwidth.


Signaling Channel Planning

Signaling channel planning aims to judge if the capacity

expansion is necessary for the network according to the

configuration and load of the network and the increase of the

signaling load after GPRS/EDGE is introduced.


Parameter Planning

DRX_TIMER_MAX

T3192

PAN_DECPAN_INCPAN_MAX

System Information Parameter Configuration


Parameter Planning

Defaulted Coding Scheme

Coding Scheme Conversion Threshold

GPRS/EDGE Cell Reselection Parameter

Other Parameters


GPRS in Dual Band Network

If the traffic guide strategy of the dual-band network enables the

1800 MHz network to take the priority to absorb the traffic, the

GPRS/EDGE service will concentrates at the 1800 MHz network,

which will cause network congestion. However, the dual-band

network cannot guide the traffic load to the 900MHz network

similarly by means of the handover used for GSM voice service.

The indoor coverage of 1800MHz network is relatively poor,

which affects the QoS of packet service, but the dual-band

network cannot take the initiative to enable the 900MHz network

to help the 1800MHz network with its indoor coverage.

GPRS/EDGE service has the following effects against

the dual-band network:


GPRS in Dual Band Network

Configure more dynamic allocation PDCH for the 1800MHz network.

When GPRS/EDGE congestion occurs at the 1800MHz network, trigger

the voice service seizing the dynamic allocation PDCH to hand over to

the 900MHz network.

Apply the dynamic allocation PDCH released by the previous handover

to the GPRS/EDGE service.

The following methods can solve GPRS/EDGE

congestion problems:

If the GPRS/EDGE MS attaches to the 1800MHz network and the service

problems are caused by poor coverage, you need to solve the problem

by improving the coverage planning for the 1800MHz network or

changing the priority of the 1800MHz network.


GPRS Network Performance Indication

The following two indexes are quite important for capacity

planning. The system performance will deteriorate sharply if they

are not properly planned.

Mean length of LLC PDUs (by uplink and downlink)

Uplink and downlink TBF overhead on CCCH

The following two indexes can work as reference for network

expansion.

PDCH utilization rate

Uplink TBF establishment rejects

GPRS/EDGE Indexes Deserved Special Attention


GPRS/EDGE Bid Case


GPRS throughput should be CS1 to 4 and EDGE should support MCS1 to

MCS9. Also be able to cater for 2 TS in the uplink direction and 4 in the

download direction.

Expect averages of 100 Kbits for GPRS and 250 Kbits for EDGE (UL: 30% and

DL:70%) for each subscriber under high load.

Saudi Arabia 3rd License

Bid Items:

bps6.193600

70%1000kbits)(100(bps) GPRS of subscriberper Bandwidth BH

bps6.483600

70%1000kbits)(250(bps) EDGE of subscriberper Bandwidth BH


GPRS network planning data input:

CS GOS 2%

CS Traffic (ERL) 0.0145

Penetration of GPRS subscribers 10%

BH Bandwidth per subscriber of

GPRS (bps) 19.6

Average bear speed on layer IP

(kbps) 8.56

Peak Average Ratio of GPRS 25%

GPRS GOS 1%

BH Bandwidth (consider Peak

Average Ratio) per subscriber of

GPRS (bps)

24.5

Code Style Speed (kbps) Subs. Per.

CS1 5.73 0%

CS2 8.56 100%

CS3 10.33 0%

CS4 14.37 0%



GPRS network planning result:

TRX

Number per

Cell

Available

number of

TCH/PDCH

Max

subscribers

per cell

CS traffic

per cell(Erl

Number of

PDCH

Min Number

of static

PDCH

Number of

static PDCH

Number of

dynamic

PDCH

1 7 201 2.92 0.38 0 0 1

2 14 509 7.39 0.57 1 1 1

3 22 961 13.94 0.80 1 1 1

4 29 1383 20.05 0.98 1 1 1



EDGE network planning data input:

CS GOS 2%

CS Traffic (ERL) 0.0145

Penetration of EDGE subscribers 5%

BH Bandwidth per subscriber of

EDGE (bps) 48.6

Average bear speed on layer IP (kbps) 21.18

Peak Average Ratio of EDGE 25%

EDGE GOS 1%

BH Bandwidth (consider Peak

Average Ratio) per subscriber of

EDGE (bps)

60.75

Code Style Speed (kbps) Subs. Per.

MCS1 6.28 0%

MCS2 7.96 0%

MCS3 10.50 0%

MCS4 12.63 0%

MCS5 15.82 0%

MCS6 21.19 100%

MCS7 31.25 0%

MCS8 39.06 0%

MCS9 43.10 0%



EDGE network planning result:

TRX Number

per Cell

Available

number of

TCH/PDCH

Max

subscribers

per cell

CS traffic

per

cell(Erl

Number

of

PDCH

Min

Number of

static

PDCH

Number

of static

PDCH

Number of

dynamic

PDCH

1 7 201 2.92 0.10 0 0 1

2 14 509 7.39 0.17 1 1 1

3 22 961 13.94 0.26 1 1 1

4 29 1383 20.05 0.34 1 1 1



Total PDCH configuration:

Number of TRX per

Sector

EDGE and GPRS Dedicated

TS

Dynamical allocated (Switchable) to

EDGE TS

1 0 3

2 1 3

3 1 3

4 1 3


Thank You

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156378879-04D-GPRS-EDGE-Network-Planning-V1-0(1).pdf

Documents

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network planning strategy

coverage planning chapter

parameter planning chapter

channel planning chapter

frequency planning chapter

gprsedge network planning

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