GPRS&EDGE Network Planning-V1.0

7/27/2019 GPRS&EDGE Network Planning-V1.0

http://slidepdf.com/reader/full/gprsedge-network-planning-v10 1/50

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

HUAWEI Confidential

Security Level:

GPRS/EDGE NetworkPlanning

V1.0



HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 2

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

Understand GPRS/EDGE overall networkplanning principles

Master GPRS/EDGE capacity planningmethodology

Master GPRS/EDGE coverage, parameter planning principle




Chapter 1 Overall Network Planning PrincipleChapter 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






Result in additional interference

Load of signaling changes

Radio resource usage becomes more complexTraffic model changes and network planning strategyshould be adjusted

If a GPRS/EDGE network is introduced, it will bring thefollowing effects against the existing GSM network:

GPRS Overall Network Planning Principle




Chapter 1 Overall Network Planning PrincipleChapter 2 Traffic Model











Traffic Model

Currently, the GPRS/EDGE network in China enables thefollowing 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

relaySNDCP GTP

Um Gb Gn Gi

V_IP VGb




Transmission principle of data packet on Um interface

IP data package

Subscriber data RLC/MAC headLLC headSNDCP 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 = (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 asfollows:








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 singleservice

The following contents are closely related toGPRS/EDGE traffic model:




Chapter 1 Overall Network Planning Principle

Chapter 2 Traffic Model


Chapter 4 Coverage PlanningChapter 5 Frequency Planning








Capacity Planning

To configure proper PDCH channels, Pb, Gb and Abisinterface resource to serve a certain quantity of

GPRS/EDGE subscriber.






Capacity Planning

1) Data Input:

CodeScheme

Rate at IPLayer

Ratio Abis Idle

Circuit

CS1 5.73 20% 0

CS2 8.56 80% 0CS3 10.33 0% 1

CS4 14.37 0% 1

Average Rate at IPLayer

8.00




Capacity Planning2) 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 SubscriberConsidering 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 Volume GOS)

PDCH = "GPRS Channel" Quantity* Each "GPRS Channel" Bandwidth (kbps)/Rate at IP Layer (kbps)

CellTRX

Quantity

Available

TCH/PDCH Count

CellMaximum

Subscriber

Quantity

CellVoice

ServiceTrafficVolume

Erl

TCHQuantity

GPRSServiceTrafficVolume

Erl

"GPRSChannel"Quantity

PDCHQuantity

StaticPDCH

StaticPDCH

DynamicPDCH

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-slotsto support high rate of code scheme

Pb Gb Abis Interface Calculation




Example

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

Active PDCH: 410+410* 50% =615

In Pb interfaceMinimum 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 (2Mbps × 70% 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 is8kbps and VGb is 1.166*V_IP.







Chapter 4 Coverage PlanningChapter 5 Frequency Planning








Coverage Planning

EIRP (Equivalent Isotropic Radiated Power) is the same.

The loss from transmission end to reception end is the same except bodyloss.

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 voiceservice, the C/I is 9 dB). If PDCHs are configured on BCCH carrier, the C/Ican meet the requirement.

Compared with GSM coverage, the GPRS/EDGEcoverage 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 conversationquality and C/I, see the following table.

rxqua l 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 voicecoverage 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 typesunder GMSK modulation scheme (common BTS) GSM900




Coverage Planning

For the signal level requirements of various channel typesunder GMSK modulation scheme (common BTS) DCS1800

DCS 1 800

Channel Type Transmission Conditions

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 -101USF/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 PlanningFor the C/I requirements of various channel types under

GMSK modulation scheme, GSM900GSM 900

Channel TypeTransmission Conditions

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 bits 1) dBm 8 8 8 8 10

PRACH/8 bits 1) dBm 8 8 8 8 9




Coverage PlanningFor the C/I requirements of various channel types under

GMSK modulation scheme, DCS1800DSC1800 MHz

Channel TypeTransmission Conditions

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 9PDTCH/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

PRACH/11 bits 1) dBm 9 9 9 9 10

PRACH/8 bits 1) dBm 8 8 8 8 9
















Frequency Planning

Frequency planning aims to decide frequency reuse patternaccording to C/I requirement, capacity requirement, and theavailable bandwidth.
















Signaling Channel Planning

Signaling channel planning aims to judge if the capacityexpansion is necessary for the network according to theconfiguration and load of the network and the increase of thesignaling load after GPRS/EDGE is introduced.










Chapter 7 Parameter PlanningChapter 8 GPRS in Dual Band Network and





Parameter Planning

DRX_TIMER_MAX

T3192

PAN_DEC PAN_INC PAN_MAX

System Information Parameter Configuration












Chapter 7 Parameter PlanningChapter 8 GPRS in Dual Band Network and





GPRS in Dual Band Network

If the traffic guide strategy of the dual-band network enables the1800 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-bandnetwork cannot guide the traffic load to the 900MHz networksimilarly 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-bandnetwork cannot take the initiative to enable the 900MHz networkto help the 1800MHz network with its indoor coverage.

GPRS/EDGE service has the following effects againstthe 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 tothe 900MHz network.

Apply the dynamic allocation PDCH released by the previous handover to the GPRS/EDGE service.

The following methods can solve GPRS/EDGEcongestion problems:

If the GPRS/EDGE MS attaches to the 1800MHz network and the serviceproblems are caused by poor coverage, you need to solve the problemby 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 capacityplanning. The system performance will deteriorate sharply if theyare 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 networkexpansion.

PDCH utilization rate

Uplink TBF establishment rejects

GPRS/EDGE Indexes Deserved Special Attention




GPRS/EDGE Bid Case






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%

Saudi Arabia 3rd License




GPRS network planning result:

TRXNumber per

Cell

Availablenumber of

TCH/PDCH

Maxsubscribers

per cell

CS trafficper cell(Erl

Number of PDCH

Min Number of staticPDCH

Number of static PDCH

Number of dynamicPDCH

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

subscribersper cell

CS traffic

per

cell(Erl

Number

of

PDCH

MinNumber 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 perSector

EDGE and GPRS DedicatedTS

Dynamical allocated (Switchable) toEDGE TS

1 0 3

2 1 3

3 1 3

4 1 3




Thank You

www.huawei.com

Documents

GPRS&EDGE Network Planning-V1.0