OMP121000 GPRS EDGE Build-In PCU Radio Network Planning ISSUE1.00

8/11/2019 OMP121000 GPRS EDGE Build-In PCU Radio Network Planning ISSUE1.00

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Copyright 2011 Huawei Technologies Co., Ltd. All rights reserved.

GPRS-EDGE Radio

Network Planning


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Copyright 2011 Huawei Technologies Co., Ltd. All rights reserved. Page2

Objectives

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

Familiarize with the general principles of GPRS/EDGE

network planning.

Grasp the methods of GPRS/EDGE capacity planning

Grasp the information about the coverage, parameters, and

signaling planning of the GPRS/EDGE network.


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Contents

1. Planning Principle

2. Capacity Planning (Um, Abis, Gb)

3. Coverage Planning

4. Frequency Planning

5. Signaling Channel Planning

6. Dual-band Network Solution


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Planning Principle

Take both the speech services and the data services into

consideration.

Fully utilize the existing GSM network resources.

Ensure the quality of the GSM network to meet the

requirements of the GPRS/EDGE services.


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Influence of GPRS/EDGE

Additional interference

Change of signaling load

More complicated radio resource allocation

Adjustment of the traffic model and the overall planning


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Contents








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Basic Information of Capacity Planning

Compared with the CS services, GPRS/EDGE features higherefficiency and utilization of radio resources. It is applicable to

the services with the following features

Burst data transmissions at intervals much longer than the

transmission delay Frequent data transmissions with a small amount of data, such as

several transmissions per minute and less than thousands of bytes

per transmission.

Infrequent data transmissions with a large amount of data, such as

several transmissions per hour and more than tens of thousands of

bytes per transmission.


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Traffic Model

Pay attention to the following contents of the

GPRS/EDGE traffic model:

User model: total traffic volume of data services,

proportions of different services, distribution of services by

time, and distribution of services by space

Traffic model: length of packet and interval between

packets of a single service.

Radio transmission model: coding scheme distribution andsignaling overhead


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Count Average Rate at IP Layer of PDCH

GPRS Capacity Budget FlowBegin

Count GPRS Channel Bandwidth

Count GPRS Service Busy Hour

Traffic Volume per Subscriber (Erl)

Count Cell Maximum Subscriber Quantity

End

Count Static/Dynamic PDCH


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Contents


2.1 Capacity Planning of Um Interface

2.1.1 Average bearing rate at the IP layer

2.1.2 The Bandwidth and traffic of GPRS channel

2.1.3 PDCH number for each cell

2.2 Capacity Planning of Abis and Gb Interface


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Data Transmission Plane

MAC: Media Access Control

RLC: Radio Link Control

LLC: Logical Link Control

BSSGP: BSS GPRS Protocol

SNDCP: Sub-Network Dependency Convergence Protocol

GTP: GPRS Tunneling Protocol

Application

IP/X.25 IP/X.25 IP/X.25

SNDCP GTP

UDP/TCP UDP/TCP

RLC BSSGP BSSGP IP IP

MAC MACNetworkService

NetworkService L2 L2

L2 (MAC)

PhysicalLayer

PhysicalLayer

PhysicalLayer

PhysicalLayer

PhysicalLayer

PhysicalLayer

PhysicalLayer

MS BSS SGSN GGSN

relaySNDCP GTP

Um Gb Gn Gi

LLC LLC

relayRLC


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RLC/MAC Block Generation

Subscriber IP packet

SNDCP PDU

LLC PDU

RLC/MAC block

Subscriber data RLC/MAC headLLC headSNDCP head LLC FCS


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Average Bearing Rate at IP Layer--

Input

Calculate the PDCH carrier rate for each codec Ri

Suppose RLC is ACK moderesending rate is R1

Suppose in the all blocks, R2 percent is RLC/MAC control block

Suppose LLC frame format isIP dataH1

Suppose at least for N blocks ,the IP data is in series

Suppose IP packet length is L

Suppose B is LLC PDU BYTE carried on RLC data packet


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Average Bearing Rate at IP Layer--

Output A1 is the total BYTE of N LLC PDU=L+H1*N

A2 is the total BYTE of N IP packet=L*N

M is the minimal RLC blocks for sending N LLC PDU=A1 / B

T is the time for sending N LLC PDU=(M+M*R2+M*R1)*0.02

Ri is IP rate of each PDCH (Kbps)=A2*8/T/1024

Put in the proportion of each codec Pi

Get the IP rate of each PDCH

RiPiRA vg


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Average Bearing Rate at IP Layer-

Example

Parameters input


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Average Bearing Rate at IP Layer

A1(3209431)103370 Bytes

M3370 / 30113 Blocks

T ( 11311320%11310%)20ms

2920ms2.92s

V_IP320108 / 2.92 / 10248.56 Kbps

VGb1.166V_IP9.98Kbps

Calculation of CS2

round upround down


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CS1 CS2 CS3 CS4

9.05 13.4 15.6 21.4

20 30 36 50

3370 3370 3370 3370

3200 3200 3200 3200

169 113 94 68

4.36 2.92 2.42 1.74

5.73 8.56 10.33 14.37

Coding mode

Um Physical Level Rate(Kbps)

B: RLC Bytes For LLC PDU(Bytes)A1: N LLC PDU Bytes =L+H1*N

A2: N IP Packets Bytes=L*N

M: RLC Block Nummber for N LLC PDU=[A1 /

T: Time For N LLC PDU=(M+M*R2+M*

V_IP:IP Rate For PDCH(Kbps)=A2*8/T/1000


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Average Bearing Rate over IP

Layer

MCS1 MCS2 MCS3 MCS4

8.8 11.2 13.6/14.8 17.6

22 28 37 44

3370 3370 3370 3370

3200 3200 3200 3200

154 121 92 77

3.98 3.14 2.38 1.98

6.28 7.96 10.50 12.63


M: RLC Block Nummber for N LLC PDU=[A1

T: Time For N LLC PDU=(M+M*R2+M


Coding mode


B: RLC Bytes For LLC PDU(Bytes)

A1: N LLC PDU Bytes =L+H1*N


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MCS5 MCS6 MCS7 MCS8 MCS9

22.4 27.2/29.6 44.8 54.4 59.2

56 74 112 136 148

3370 3370 3370 3370 3370

3200 3200 3200 3200 3200

61 46 31 25 23

1.58 1.18 0.8 0.64 0.58

15.82 21.19 31.25 39.06 43.10


M: RLC Block Nummber for N LLC PDU=[A1

T: Time For N LLC PDU=(M+M*R2+M


Coding mode


B: RLC Bytes For LLC PDU(Bytes)

A1: N LLC PDU Bytes =L+H1*N


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The average

bearing rate over IP

layer

Code

SchemeIP Rate Proportion

Abis idle

timeslot

MCS1 6.28 0% 0

MCS2 7.96 0% 0

MCS3 10.50 0% 1

MCS4 12.63 0% 1

MCS5 15.82 0% 1

MCS6 21.19 0% 1

MCS7 31.25 0% 2

MCS8 39.06 0% 3

MCS9 43.10 0% 3

CS1 5.73 20% 0

CS2 8.56 80% 0

CS3 10.33 0% 1

CS4 14.37 0% 1

Average Rate at IP

layer8.00


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Contents








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Data Input:

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

Capacity Planning

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) 1.00GPRS Service Busy Hour Traffic Volume per Subscriber (Erl) 0.18

PDCH Channel Multiplex Count 8


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Capacity Planning

(kbps)layerIPatratebearingAverage

kbps)bandwidth(channelGPRSEach

ServiceGPRSofConnectionEachbyOccupiedChannelPDCH

1024(kbps)BandwidthChannelGPRSlEach

(bps)RatioForceAP_togConsiderinSubscriberperBandwidthRequiredHourBusyGPRS

SubscriberperVolumeTrafficHourBusyServiceGPRS


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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)

Capacity Planning

Cell

TRX

Quan

tity

Avail

able

TCH/P

DCH

Count

Cell

Maximum

Subscri

ber

Quantit

y

Cell

Voice

Service

Traffic

VolumeErl

TCH

Quan

tity

GPRS

Service

Traffic

Volume

Erl

"GPRS

Channel"

Quantity

PDCH

Quan

tity

Stat

ic

PDCH

Stat

ic

PDCH

Dyna

mic

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


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Capacity Planning of Gb

The build-in packet service processing board GDPUP canprocess 1024 pieces of PDCH channel with MCS9

simultaneously. So the required board number can be

calculated according to the maximum active PDCH number.

VGb1.166V_IP Normally, the Gb interface is connected with E1, so the

bandwidth for each connecti0n is 2Mbps. Suppose the

utilization rate is 70%, then,

The quantity of E1 on Gb=VGb/2M*70% = 1.166V_IP/1.4Mbps The GEPUG number can be calculated from the total E1

number of Gb

GEPUG board number = The quantity of E1 on Gb/32


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Capacity Planning of Abis

No matter fix Abis or flex Abis, just one thing we need to

consider is that whether the idle timeslot number is

abundant.

channel coding typeRequired 16k Abistimeslot number

for each channel

Required idle

timeslot

number for

each channel

CS1,2; MCS1,2 1 0

CS3,4; MCS3,4,5,6 2 1

MCS7 3 2

MCS8,9 4 3


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Coverage Planning

Compared with the GSM network coverage, the GPRS/EDGEnetwork coverage has the following characteristics:

Same EIRP

Except the body loss, other loss between the transmit end and the

receive end is the same as that in the GSM system. The GPRS/EDGE services are mainly affected by the C/I instead of

the receiver sensitivity.CS-3 coverage area

CS-4 coverage area

CS-2 coverage area

CS-1 coverage area


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Coverage Target

When the BLER is lower than 10%, the network coverage

in CS1 coding scheme is the same as the network

coverage of speech services.

When the BLER is lower than 10%, the network coveragein CS2 coding scheme is 80% of the network coverage of

speech services.

The quality and C/I relationship

rxqual 0 1 2 3 4 5 6 7

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


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Coverage Planning For the signal level requirements of various channel types

under GMSK modulation scheme (common BTS) GSM900

GSM 900

Channel TypeTransmission Conditions

StaticTU50

(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/11bits

dBm -104 -104 -104 -103 -103

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


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under GMSK modulation scheme (common BTS) DCS1800

DCS 1 800


StaticTU50

(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


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under GMSK modulation scheme (MS)

GSM900

Channel Type

Transmission Conditions

StaticTu50

(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


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Coverage Planning For the C/I requirements of various channel types under GMSK

modulation scheme, GSM900

GSM900


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

PRACH/11bits1)

dBm 8 8 8 8 10

PRACH/8 bits1) dBm 8 8 8 8 9


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Coverage Planning For the C/I requirements of various channel types under GMSK

modulation scheme, DCS1800

DSC1800 MHz

Channel Type

Transmission 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 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

PRACH/11bits1)

dBm 9 9 9 9 10

PRACH/8 bits

1)

dBm

8 8 8 8 9


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Frequency Planning

Determine the frequency reuse pattern based on the C/Irequirement, capacity planning requirement, and

available bandwidth.

The requirement of capacity planning in the early stage is

not high. According to the coverage planning, the C/I of

TCH on the BCCH meets the requirement of GPRS services.

If the PDCH is configured on the TRX carrying the BCCH,

factors such as 1X3, 1X1, MRP, concentric cell, frequencyhopping, and power control need not be considered

during frequency planning.


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Frequency Planning

On the existing network, the BCCH carrier does not use

the power control, DTX, frequency hopping techniques.

The 4X3 frequency reuse pattern is used. Therefore, the

advantages of PDCH configuration on the BCCH

frequency are as follows:

The C/I can meet the requirement of GPRS network

coverage.

There is no additional interference brought by data services

to the GSM services.

If the TRX carrying the BCCH is configured with baseband

frequency hopping, considering the multi-timeslot capability


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Frequency Planning

If the PDCH is configured on the non-BCCH frequency, as

the TCH uses the power control, DTX, tight frequency

reuse, and concentric cell techniques,

The C/I probably cannot meet the requirement of GPRSnetwork coverage.

Data services may bring about addition interference to the

GSM services. This will decrease the service area of the

speech services.

If frequency hopping is used, the PDCHs on the same TRX

must have the same MAIO and HSN. However, for the GPRS

network, frequency hopping does not have the benefits as

ex ected.


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Frequency Planning

When the PDCHs are insufficient even if all the TCHs on

the BCCH are configured as PDCHs, can configure PDCHs

on other TRXs. In this case, use frequency hopping to

reduce the MS' requirement on C/I

When the EDGE network is configured with baseband

frequency hopping, all the TRXs participating in the

frequency hopping must support EDGE services.


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Signaling Channel Planning

Determine whether capacity expansion is required on the

basis of the configuration and load of the network as

well as the increase of signaling load after GPRS/EDGE

services are introduced.

Utilize the radio channel resources more appropriately

and efficiently.


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When calculating the increment of paging channels, you

need to consider that the CS paging messages of some

PDPACTIVE GPRS MSs will be retransmitted because

these MSs cannot listen to the PCH during the data

transfer process.

According to the current network conditions, the

capacity expansion of the RACH and PCH is unnecessary.

However, more AGCHs should be configured to support

the GPRS services.


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To avoid AGCH congestion, you can use the following

methods:

Use non-combined CCCH configuration mode. Increase the

number of reserved AGCH blocks (pay attention to the PCH

load). Configure multiple non-combined CCCHs.

Use PCCCH as early as possible.

Gs interface support


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The allocation of the routing area (RA) also affects theplanning of signaling channels. Currently, the RA can be the

same as the LA.

However, with the increase of GPRS users, the RA size and the

number of packet paging messages should be reduced to

decrease the PCH load.

Check whether the PCH is overloaded and whether the traffic

volume of packet paging is oversized according to the trafficmeasurement results, and then determine whether to re-

allocate the RA .


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Dual-band Network Planning

To solve the problem of GPRS/EDGE traffic congestion onthe GSM1800 network, use the following methods :

Configure more dynamic PDCHs on the GSM1800 network.

When the GPRS/EDGE traffic congestion on the GSM1800network occurs, trigger the handover of the speech services

occupying the dynamic PDCHs to the GSM900 network.

The dynamic PDCHs released after the handover can be

used for the GPRS/EDGE services.


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System performance counters: counters used to measurethe processing capability and data throughput capability

of the system

Maintenance counters: counters used to measure theexception conditions of the system

Reference counters: counters related to the traffic model


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The following two indexes are quite important forplanning.

Mean length of LLC PDUs (by uplink and downlink)

Uplink and downlink TBF overhead on CCCH PDCH utilization rate

Uplink TBF establishment rejects


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Summary

We learn the GPRS/EDGE radio network planning in thiscourse, including coverage planning, capacity planning,

frequency planning and signaling channel planning.

The key part of this course is the capacity planning.Because the traffic model is different from GSM system.


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OMP121000 GPRS EDGE Build-In PCU Radio Network Planning ISSUE1.00

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