Download - Huawei GPRS Planning
GPRS EDGE External PCU Radio
Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
47pt
30pt
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47pt
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28pt
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细黑体
GPRS/EDGE Network
Planning
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
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.
Page2
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Network Planning
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32pt
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Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
Page3
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32pt
) :18pt
Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
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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
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
Page7
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Basic Information of Capacity
Planning Compared with the CS services, GPRS/EDGE features higher
efficiency 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
Currently, GPRS/EDGE and GSM share the CCCH. If the PCCCH
access mode is used, there are great changes in the signaling
channel planning, parameter planning.
It is difficult to accurately predict the GPRS/EDGE traffic model,
because the GPRS/EDGE traffic model cannot be described
simply by traffic volume (Erlang) per user.
The GPRS/EDGE traffic model should be modified with the
development of new services. In addition, the risk of traffic
model mutation due to the introduction of new services should
be avoided.
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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 and
signaling overhead
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Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
Page11
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GPRS Capacity Budget Flow
Count Average Rate at IP Layer of PDCH
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
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Capacity Planning Flow
There are 6 steps for the GPRS capacity planning:
Calculate the average bearing rate over the IP layer according
to the data rate of each coding scheme and the ratio of each
coding scheme to the overall coding schemes.
Calculate the bandwidth of each GPRS channel.
Calculate the traffic volume per GPRS MS in busy hours
Page13
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Capacity Planning Flow
Calculate the maximum number of MSs per cell as follows:
Determine whether the CS services and PS services are limited
under a certain number of MSs.
Use the double Iterative algorithm to calculate the maximum
number of MSs in a cell.
Calculate the number of PDCHs occupied by GPRS services.
Calculate the number of static and dynamic PDCHs required
by actual GPRS services.
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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 MAC Network Service
Network Service L2 L2
L2 (MAC)
Physical Layer
Physical Layer
Physical Layer
Physical Layer
Physical Layer
Physical Layer
Physical Layer
MS BSS SGSN GGSN
relay SNDC
P GTP
Um Gb Gn Gi
LLC LLC
relay RLC
Page15
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RLC/MAC Block Generation
Subscriber IP packet
SNDCP PDU
LLC PDU
RLC/MAC block
Subscriber data RLC/MAC head LLC head SNDCP head LLC FCS
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IP Rate
Calculate the PDCH carrier rate for each codec Ri:
Suppose RLC is ACK mode,resending rate is R1
Suppose in the all blocks, R2 percent is RLC/MAC control block
Suppose LLC frame format is :IP data+H1
Suppose at least for N blocks ,the IP data is in series
Suppose IP packet length is L
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IP Rate
B is LLC PDU BYTE carried on RLC data packet
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
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IP Rate
Put in the proportion of each codec Pi;
Get the IP rate of each PDCH:
RiPiRA
=vg
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IP Rate
Parameters input:
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IP Rate
A1 = (320+9+4+3+1)×10 =3370字节
M =「 3370 / 30 」=113 块
T = ( 113 + 『113×20%』+『113×10%』)×20ms=
2920ms=2.92s
V_IP= 320×10 ×8 / 2.92 / 1024=8.56 Kbps
VGb=1.166V_IP=9.98Kbps
Calculation of CS2:
「 」 round up, 『』 round down
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IP Rate
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 / B]
T: Time For N LLC PDU=(M+「M*R2」+「M*R1」)*.02
V_IP:IP Rate For PDCH(Kbps)=A2*8/T/1000
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IP Rate
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
A2: N IP Packets Bytes=L*N
M: RLC Block Nummber for N LLC PDU=[A1 / B]
T: Time For N LLC PDU=(M+「M*R2」+「M*R1」)*.02
V_IP:IP Rate For PDCH(Kbps)=A2*8/T/1000
Coding mode
Um Physical Level Rate(Kbps)
B: RLC Bytes For LLC PDU(Bytes)
A1: N LLC PDU Bytes =(L+H1)*N
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IP Rate
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
A2: N IP Packets Bytes=L*N
M: RLC Block Nummber for N LLC PDU=[A1 / B]
T: Time For N LLC PDU=(M+「M*R2」+「M*R1」)*.02
V_IP:IP Rate For PDCH(Kbps)=A2*8/T/1000
Coding mode
Um Physical Level Rate(Kbps)
B: RLC Bytes For LLC PDU(Bytes)
A1: N LLC PDU Bytes =(L+H1)*N
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IP Rate Code
Scheme IP 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 layer
8.00
Page26
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Capacity Planning 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
Page27
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Capacity Planning
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)
Data Output:
Cell TRX Quantity
Available TCH/PDCH
Count
Cell Maximum Subscriber
Quantity
Cell Voice
Service Traffic Volume(Erl)
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
Page28
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Capacity Planning
Pb,Gb,Abis Interface Calculation
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
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Example
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.
Page30
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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
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Example
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 Page32
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Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
Page33
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Coverage Planning
The valid coverage area is subject to two parameters: signal-
to-noise ratio (C/N) and signal strength. C/N determines the
signal transmission quality (bit error rate BER or block error
rate BLER). The coverage area analysis is based on the
similarity between the two parameters in the GPRS system and
the two parameters in the GSM system.
For different coding schemes on the same channel, the BERs
are different. For the same BER on the same channel, the
coverage areas under different coding schemes are different.
The BER performance mentioned later refers to the BLER.
Page34
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Coverage Planning
Compared with the GSM network coverage, the GPRS/EDGE
network 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 coverage
in CS2 coding scheme is 80% of the network coverage of
speech services.
Page36
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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 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
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Coverage Planning
For the signal level requirements of various channel types
under 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 -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
Page38
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Coverage Planning
For the signal level requirements of various channel types
under GMSK modulation scheme (MS)
GSM900
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 bits1) dBm -104 -104 -104 -103 -103
PRACH/8 bits1) dBm -104 -104 -104 -103 -103
Page39
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Coverage Planning
For the C/I requirements of various channel types under
GMSK modulation scheme, GSM900
GSM 900
Channel Type
Transmission 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 bits1) 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/11 bits1) dBm 9 9 9 9 10
PRACH/8 bits1) dBm 8 8 8 8 9
Page41
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Coverage Planning
The quality and C/I relationship
When the BLER in CS1 coding scheme is lower than 10%, the requirement
is the same as the C/I requirement of voice quality level 4.
When the BLER in CS2 coding scheme is lower than 10%, the requirement
is the same as the C/I requirement of voice quality level 3.
Therefore, you can analyze the GPRS network coverage based on the
existing GSM network coverage and voice quality. In CS1 coding scheme,
the coverage area of the GPRS network is almost the same as that of the
GSM network. In CS2 coding scheme, as the C/I is improved, the coverage
area of the GPRS network is about 80% of that of the GSM network.
rxqual 0 1 2 3 4 5 6 7
C/I[dB] 23 19 17 15 13 11 8 4
Page42
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Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
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Frequency Planning
Determine the frequency reuse pattern based on the C/I
requirement, 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, frequency
hopping, and power control need not be considered
during frequency planning.
Page44
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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
of the GPRS MS, all the PDCHs must have the same MAIO Page45
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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 GPRS
network 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
expected. Page46
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
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.
Page47
GPRS EDGE External PCU Radio
Network Planning
Confidential Information of Huawei.
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
Page48
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
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.
Page49
GPRS EDGE External PCU Radio
Network Planning
Confidential Information of Huawei.
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Signaling Channel Planning
Calculate the capacity of signaling channels based on the
network configuration.
According to the GPRS/EDGE traffic model, calculate the
increment of signaling channel load per WAP user after
GPRS/EDGE services are introduced in the GPRS/EDGE signaling
process and data transfer process.
According to the GPRS/EDGE traffic model, calculate the
increment of signaling channel load per Internet user after
GPRS/EDGE services are introduced in the GPRS/EDGE signaling
process and data transfer process.
Page50
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Signaling Channel Planning
Obtain the number of WAP users and the number of
Internet users through capacity planning.
Calculate the total increment of the signaling channel
load after the GPRS/EDGE services are introduced.
Determine whether the CCCH capacity expansion is
required on the basis of the network load.
Page51
GPRS EDGE External PCU Radio
Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Signaling Channel Planning
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.
Page52
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Signaling Channel Planning
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
Page53
GPRS EDGE External PCU Radio
Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Signaling Channel Planning
The allocation of the routing area (RA) also affects the
planning 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 traffic
measurement results, and then determine whether to re-
allocate the RA .
Page54
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
Page55
GPRS EDGE External PCU Radio
Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Parameters Planning
DRX_TIMER_MAX
T3192
PAN_DEC、PAN_INC、PAN_MAX
Page56
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Other Parameters
Defaulted Coding Scheme
Coding Scheme Conversion Threshold
GPRS/EDGE Cell Reselection Parameter
Page57
GPRS EDGE External PCU Radio
Network Planning
Confidential Information of Huawei.
No Spreading Without Permission 29
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Contents
1. Planning Principle
2. Traffic Model
3. Capacity Planning (Um, Abis, Pb, Gb)
4. Coverage Planning
5. Frequency Planning
6. Signaling Channel Planning
7. Parameters Planning
8. Dual-band Network Planning
Page58
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Dual-band Network Planning
The impact of GPRS/EDGE services on the dual-band
network is as follows :
In the dual-band network, if the traffic on the GSM1800
network are preferred, the GPRS/EDGE services are
concentrated on the GSM1800 network, leading to network
congestion. However, the network cannot use the service
handover method as used in the GSM network to switch the
traffic to the GSM900 network.
The coverage of the GSM1800 network is poor, which
affects the quality of the PS services. However, the network
cannot actively switch the traffic to the GSM900 network.
Page59
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Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Dual-band Network Planning
To solve the problem of GPRS/EDGE traffic congestion on
the GSM1800 network, use the following methods :
Configure more dynamic PDCHs on the GSM1800 network.
When the GPRS/EDGE traffic congestion on the GSM1800
network 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.
Page60
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Dual-band Network Planning
System performance counters: counters used to measure
the processing capability and data throughput capability
of the system
Maintenance counters: counters used to measure the
exception conditions of the system
Reference counters: counters related to the traffic model
Page61
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Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Dual-band Network Planning
The following two indexes are quite important for
planning.
Mean length of LLC PDUs (by uplink and downlink)
Uplink and downlink TBF overhead on CCCH
PDCH utilization rate
Uplink TBF establishment rejects
Page62
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
GPRS/EDGE Planning
Case
Page63
GPRS EDGE External PCU Radio
Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Planning 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.
bps6.193600
70%1000kbits)(100(bps) GPRS of subscriberper Bandwidth BH
bps6.483600
70%1000kbits)(250(bps) EDGE of subscriberper Bandwidth BH
Page64
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Planning 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%
Page65
GPRS EDGE External PCU Radio
Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Planning Case
GPRS network planning result:
TRX
Number
per Cell
Available
number
of
TCH/PDC
H
Max
subscri
bers
per
cell
CS
traffic
per
cell(Erl)
Number
of
PDCH
Min
Number
of
static
PDCH
Number
of
static
PDCH
Number
of
dynami
c 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
Page66
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Planning Case
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%
Page67
GPRS EDGE External PCU Radio
Network Planning
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Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Planning Case
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
Page68
Copyright © 2011 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Planning Case
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
Page69