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1. IPRAN BASICS

2.  Introduction
 RSG (Radio Service Gateway)
 ASG (Aggregation Site Gateway)
 CSG (Cell Site Gateway)
 Network Architecture
 Physical Topology
 Traffic Flow
 KIRKOS SITE Logical Network Topolgy
 KIRKOS SITE Physical Board Layout

3. ET’s implemented integrated IPRAN & IPCORE solution to provide
high quality 2G ,3G and LTE (Long Term Evolution) mobile services.
ET IPRAN network is composed of ATN950B, CX600 (CX600-X8 &
CX600-X16) and NE40E equipments. Among them, ATN950B devices
are used as CSGs( Cell Site Gateway) on the base station side,
CX600-X8 are used as ASGs (Aggregation Site gateway )on the
aggregation side while CX600-X16 work as RSG (radio service
gateway) device at the base station controller site to connect
RNC/BSC. NE40E place at the same site with CS/PS play as the
same role as ZTE Voice ER, And Interconnect to the ER/CR device
which is existed in ZTE IP Core network, NE40E also connects to the
PS/CS device.
Totally, for wireless service and Core Network Solution in AA, 5 RSG
site, 21 ASG sites and 130 CSG sites have been deployed.
.
Introduction

4.  In ET network pairs are deployed for connecting
base station controllers (BSCs) and radio network
controllers (RNCs) directly and mobility
management entities (MMEs) through the NE40E.
 Five RSG sites in Addis Ababa are located at:
NifasSilk, Microwave, Bole, Arada, & Kirkos. CX600-
X16 routers are used as RSG
 Based on distributed hardware forwarding and non-
blocking switching technologies, CX600 has
features of:
 carrier-class reliability, line speed forwarding
capability, a well-designed Quality of Service (QoS)
mechanism, transmission of Ethernet over Multi-Protocol
Label Switching (EoMPLS) services, and L2 and Layer 3
(IP) services.
RSG (Radio Service Gateway)

5.  These are deployed to aggregate traffic from the access
layer.
 CX600-X8 routers are used as ASG and a pair of ASG is
installed to enhance the reliability.
ASGs (Aggregation Site Gateway)

6.  These are deployed in the access layer. One ATN950B Routers per each
CSG sites have been installed .Each CSG is connected to the nearby
ASG directly or through another CSG using the existing fiber resource.
ATN950B routers serve as a bypass 2G/3G and LTE services to the
Aggregator sites.
 At access side, Radio BTS/NodeB/eNodeB without optical resource are
connected to Microwave first then to ATN950B while Radio BTS/NodeB
/eNodeB with optical resource are connect to ATN950B directly.
 In addition to that, a pair of High-end NE40E routers at each five core
sites to integrate Huawei CS/PS service and interconnect IP CORE
network to the Existing ER/CR routers, Pair of E8000 Eudemon firewall &
S9306 switches at three core sites (Nifas Silk , Microwave & Kirkos) for
PS service and pair of S9303 switches at every core sites for CS
service have been installed.
 As an access and aggregation switch, the S9300&S9300E provide line-
speed Fast Ethernet (FE), Gigabit Ethernet (GE), 10GE, and 40GE
interfaces.
CSG (Cell Site Gateway)

7.  Core: This describes the IPCore structure ,RSG interconnection and NE40E
Integration to the Existing IPCore network.
 RSG interconnection to RNC, BSC and NE40E
 NE40E interconnection to RSG, core service, and Existing ER or CR
 VRF and IP design
 ASG: This describes the Aggregation part of the IPRAN
 CSG: Describes the Access part of the IPRAN
 IPRAN Logical Network Design
 The IP RAN is divided in to three layers as described below:
 The access layer consists of CSGs (Cell Site Gateway). The
network topology can be a ring or chain depending on fiber
connections between sites.
 The aggregation layer consists of ASGs (Aggregation Site Gateway)
aggregating traffic from the access layer. Pair of ASG for each
access area is deployed to improve the reliability of aggregation
nodes.
 RSG (Radio Service Gateway) pairs are deployed for connecting
base station controllers (BSCs), radio network controllers (RNCs)
directly and mobility management entities (MMEs) through IPCore.
 RSG interconnection to RNC, BSC and NE40E
 NE40E interconnection
Network Architecture

8. Network Architecture
ASG
CX600-X8
RSG
CX600-X16
CSG
ATN950B
NE40E
U2000
M2000
MW
RTN950A
Base
Station
MW
RTN905A
BSC/RNC BSC/RNC
MASG
MSOFT UMG
GGSN SGSN
IP Core Network
IP Core
IPRAN
Agg Layer
IPRAN
Access Layer
Base
Station
Base
Station
Base
Station
RSG
CX600-X16
ARSG
CX600-X16
RSG
CX600-X16
ASG
CX600-X8
NE40E NE40E NE40E
S9300
MASG
ASG
CX600-X8
ASG
CX600-X8
CX Ring
. . . . . .
. . . . . .

9.  In Addis Ababa the entire network topology (IPRAN) is deployed
as below with 7 rings interconnected through existing fiber
resource.
 CSG ,ASG & RSG are used to build the IPRAN .There are 7
rings and Each Ring include the following sites:
 Ring 1 include: Microwave, Old airport, Kirkos, Nafis Silk, Bole,
Filowoha
 Ring 2 include: Mekanisa, Karanyo, Old airport
 Ring 3 include: Nafis Silk, Bole Michael, Akaki, Kality, Lebu,
Hanna Mariam
 Ring 4 include: Ketema, Kolfe, Barau, Asko, Shegole
 Ring 5 include: Microwave, Ketema, Arada, Sidis Kilo, Yeka,
Bole, Filowoha
 Ring 6 include: Arada, Gebeya, Ferensail
 Ring 7 include: Yeka, Kotebe, Ayat Meronia, Gerji
Physical Topology

10. PHYSICAL Topology Ring Network
Ring5
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE 10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE 10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
10GE
2*10GE
10GE
2*10GE
2*10GE
10GE
10GE
2*10GE
10GE
10GE
1*40GE
2*10GE
10GE 10GE
10GE
1*40GE
9.3KM
2*10GE
10GE
2*10GE
2*10GE
10GE
2*10GE
2*10GE
10GE
2*10GE
2*10GE
4.9KM
2*10GE
3KM
1*40GE
4.64KM
10GE
10GE
10GE
2*10GE
5.52KM
10GE
10GE
10GE
2*10GE
4.55KM
2*10GE
10GE
10GE
2*10GE
1*40GE
5KM
2*10GE
4.6KM
10GE
2*10GE 2*10GE
2.28KM
2*10GE
4.84KM
2*10GE
2*10GE
10KM
2*10GE
10GE
10GE
2*10GE
3.44KM
2*10GE
10GE
2*10GE
10GE
10GE
2*10GE
5.6KM
10GE
10GE
2*10GE
10GE
2*40GE
10GE
2*40GE
5.03KM
10GE
10GE
10GE
10GE
1*40GE
7.3KM
2*40GE
10GE
2*40GE
6.4KM
10GE
2*10GE
14.1KM
2*10GE
10GE
2*40GE
5.64KM
2*40GE
2*10GE
5KM
2*40GE
8.03KM
2*10GE
10GE
10GE
2*40GE
3.12KM
10GE
2*40GE
1*40GE
3.47KM
2*40GE
5.2KM
10GE
2*10GE
10GE
10GE
2*10GE
5.5KM
10GE
10GE
(2*10GE)
2*10GE
3KM
Keranyo-ASG-A
Mekanisa-ASG-B
OldAirport-ASG-A
OldAirport-ASG-B
NafasSilk-RSG-B
Akaki-ASG-A
Kirkos-RSG-A Kirkos-RSG-B
BoleMichael-ASG-B
Kality-ASG-A
HannaMariam-ASG-B
Burayu-ASG-A
Burayu-ASG-B
Kolfe-ASG-A
Kolfe-ASG-B
Gebeya-ASG-B
Yeka-ASG-A
Shegole-ASG-A Ayat-ASG-A
Yeka-ASG-B
Shegole-ASG-B
Arada-RSG-B Sidiskilo-ASG-B
Kotebe-ASG-B
08N
137D
57N 05N
04N
136D
74
10
175
74N
42N
34N
78N
52N
134 36N
01N
24N
281E
288E
70
310N
311N 292E
293E
285E
306N 280E
294E
297E 313N
296
314N
309N
308N
283E
290E
307N
29N
77N
141
64N 79N
43N
47N
30N 33N
85N
56N
22N
54N
82N
122
49N
145D
80N
53D
62N
28N
41D
15N
14N
37N
63N
61N
38N
45N
194 16N
09N
35N
22D
40N
35D
81N
185D
291E
25N
44N
10GE
59N
55N
10GE
65N
10GE
76N
Keranyo-ASG-B
Asko-ASG-A
10GE
10N
10GE
10GE
10GE
69N 72N
188D
10GE
10GE
Ketema-ASG-A
10GE
67N
002D
10GE
25N
10GE
Gebeya-ASG-A
60N
Ferinas-ASG-A
Ferinas-ASG-B
Arada-RSG-A
10GE
53N
10GE
10GE
Sidiskilo-ASG-A
06N
83N
39N
10GE
45
10GE
73N
Microwave-RSG-B
10GE
71N
48N
125D
Kality-ASG-B
2*10GE
3.44KM
HannaMariam-ASG-A
Lebu-ASG-A
NifasSilk-XRSG-A
10GE
70N
10GE
17N
18D
10GE Bole-RSG--B
180D
10GE
299E
Gerji-ASG-A
75N
10GE
301E
300E
10GE
315N
10GE
10GE
298E 316N
Kotebe-ASG-A
2*10GE
9.3KM
2*10GE
9.3KM
Ayat-ASG-B
Gerji-ASG-B
10GE
295E
Akaki-ASG-B
BoleMichael-ASG-A
10GE
84N
192D
10GE
279E
168 03N
10GE
004D
Microwave-RSG-A
12
10GE
Filowoha-ASG-A
Filowoha-ASG-B
286E
Asko-ASG-B
Ketema-ASG-B
287E
052E
2*10GE
10.2KM=6.2+4.0
Mekanisa-ASG-A
312N
201
130D 51N
Bole-RSG-A
10GE
Lebu-ASG-B
317N
46N
126
50N
Ring1
Ring2 Ring3
Ring4 Ring6
Ring7
Eth-trunk
2 Eth-trunk
2
Eth-
trunk6
Eth-
trunk6
Eth-trunk
2
Eth-trunk
2
Eth-trunk
2
Eth-trunk
4
Eth-trunk
2
Eth-trunk
2
Eth-trunk
2
Eth-
trunk6
Eth-trunk
2
Eth-trunk
2
Eth-trunk
2
Eth-trunk
2
Eth-trunk
4
Eth-trunk
4
Eth-trunk
2
Eth-trunk
2 Eth-trunk
4
Eth-trunk
4
Eth-trunk
4
Eth-trunk
4
Eth-trunk
2
Eth-trunk
4
Eth-trunk
4
Eth-trunk
2
Eth-trunk
2
Eth-trunk
2
2*10GE

11.  The bandwidth of ring Microwave-Filowoha-Bole-NifasSilk-
Kirkos-OldAirport is 2*40GE
 The bandwidth of ring Microwave –Ketema-Arada-SidisKilo-
Yeka-Bole-Filowoha is 1*40GE
 The rest of the CX ring is 2*10GE
 The ATN ring is 1*10GE
 The access layer uses 10GE links for service access, but at
the aggregation 2*10GE or 1*40GE or 2*40GElinks are
used.
 Multiple physical interfaces are bundled into an Eth-Trunk
using the link aggregation technique to increase the
Bandwidth and reliability just like smart group.

12.  The traffic over IP RAN consists of both voice and data. The
voice traffic can be classified as Inter Site RNC/BSC -Voice
traffic, Intra-Site RNC/BSC Voice traffic and Inter site CS -to-
CS traffic.
 Inter Site RNC/BSC -Voice traffic is traffic between a
BSC/RNC and a CS device on another location. If the traffic is
between BSC/RNC and CS in the same site the traffic is
called Intra-Site RNC/BSC traffic. If traffic is between CS sites
it termed as Inter site CS -to-CS site traffic.
 In IP RAN Inter Site RNC/BSC -Voice traffic, Intra Site
RNC/BSC -Voice traffic and PS traffic (data) are forwarded
through IP RAN network without crossing IP CORE network.
 Inter site CS -to-CS traffic is forwarded through IP CORE
network.
Traffic Flow

13. Inter-site and Intra-site RNC/BSC Traffic Model
Inter-Site
Traffic
ZTE IP NGN
A/Abis/Gb
Iu_b/Iu_CS/Iu_U/Iu-C
A/Iu_CS/Signaling
Signaling
CX600-X16
NE40E-X8
S9303
Gom
ER/CR
ER/CR
ZTE IP NGN
A/Abis/Gb
Iu_b/Iu_CS/Iu_U/Iu-C
A/Iu_CS/Signaling
Signaling
CX600-X16
NE40E-X8
Gom
ER/CR
ER/CR
BR-1 BR-2
SITEA SITEB
Intra-Site
Traffic
IP CORE
IP BH

14. Inter site CS to CS Traffic Model
ZTE IP NGN
A/Abis/Gb
Iu_b/Iu_CS/Iu_U/Iu-C
A/Iu_CS/Signaling
Signaling
CX600-X16
NE40E-X8
S9303
Gom
CR/ER
CR/ER
ZTE IP NGN
A/Abis/Gb
Iu_b/Iu_CS/Iu_U/Iu-C
A/Iu_CS/Signaling
Signaling
CX600-X16
NE40E-X8
Gom
CR/ER
CR/ER
BR-1 BR-2
SITEA SITEB
Inter-Site
Traffic
ZTE CS
ZTE CS
IP BH
IP CORE

15. PS Traffic Model from SGSN/GGSN to RNC
A/Abis/Gb
Iu_b/Iu_CS/Iu_U/Iu-C
Gn/Gp/Ga/Iu_C/
Gr/Signaling/Gb/Li
Gn/Gp/
Signaling/Li/Gy
Gi Gi
CX600-X16
NE40E-X8
S9303
E8000E
CR/ER
A/Abis/Gb
Iu_b/Iu_CS/Iu_U/Iu-C
Gn/Gp/Ga/Iu_C/
Gr/Signaling/Gb/Li
Gn/Gp/
Signaling/Li/Gy
Gi Gi
CX600-X16
NE40E-X8
S9303 E1000E
BR1 BR2
IP BH
IP CORE
Inter-Site PS
traffic
Intra-Site Traffic
CR/ER CR/ER CR/ER
SiteA SiteB

16. KIRKOS SITE
Logical Network Topolgy
Kirkos site is the core site in the ET IPRAN network, two NE40Ex8 and two
CX600-x16 are installed in this site.
Kirkos
RSG A
CX600-X16
Kirkos
NE40E
BSC/RNC
MSOFT UMG
GGSN SGSN
IP Core Network
IP Core
IPRAN
Agg Layer
IPRAN
Access Layer
Kirkos
RSG B
CX600-X16
Nifas silk
RSG-A
CX600-X16
Nifas silk
RSG B
CX600-X16
OLD
AIRPORT
ASG A
CX600-X8
Kirkos
NE40E
Nifas silk
NE40E
Nifsa silk
NE40E
Kirkos Nifas silk
CX Ring
OLD
AIRPORT
ASG B
CX600-X8
56N-DCSG
49N-DCSG

17. KK Site Before Migration
Kirkos_ER_DATA_A Kirkos_ER_DATA_B
Kirkos_ER_HW_A Kirkos_ER_HW_B
Kirkose_FW_PS_A Kirkos_FW_PS_B
Microwave_SW_PS_A Microwave_SW_PS_B
Kirkos_SW_CS_A Kirkos_SW_CS_B
M6000
NE40E-
X8
CX600-X16
S9300
E8000E
Nifas silk RSG-A
Old airport ASG-B
BSC
RNC
BSC RNC
Kirkos_RSG_A Kirkos_RSG_B
6*GE
10GE
40GE
Eth-Trunk
5
Key
Eth-trunk 15
Eth-trunk 30
Eth-trunk 25
Eth-trunk 20
Eth-trunk 10
49N
56N
6*GE
ATN950B
Eth-trunk 2
Eth-trunk 2
Eth-trunk 15
Eth-trunk 15
Eth-trunk 3
11*10GE
Eth-trunk 1
GE

18. KK Site After Migration
After migration NE40E which already connect with 6gei bundle interfaces of
Kirkos edge routers will be changed to 1*10 gei interface of Arada core
routers.Kirkos site is located in ring 1. Here there used same interfaces on
both ends of the devices for interconnection.
AD_CR_A AD_CR_B
Kirkos_ER_HW_A Kirkos_ER_HW_B
Kirkose_FW_PS_A Kirkos_FW_PS_B
Microwave_SW_PS_A Microwave_SW_PS_B
Kirkos_SW_CS_A Kirkos_SW_CS_B
M6000
NE40E-
X8
CX600-X16
S9300
E8000E
Nifas silk RSG-A
Old airport ASG-B
BSC
RNC
BSC RNC
Kirkos_RSG_A Kirkos_RSG_B
10GE
40GE
Key
Eth-trunk 15
Eth-trunk 30
Eth-trunk 25
Eth-trunk 20
Eth-trunk 10
49N
56N
6*GE
ATN950B
Eth-trunk 2
Eth-trunk 2
Eth-trunk 15
Eth-trunk 15
Eth-trunk 3
11*10GE
Eth-trunk 1
GE

19. Physical Layout and Rack Desgn
Board Layout(NE40E)
There are two types of LPU’s which are installed in the NE40E-x8 which have 8 LPU
slots Only one 40GE LPUs is installed in the Slot1 three 10x10Ge LPUs are
installed in slot2,slot6 and slot7. All the LPU type can be intall in from slot1 to slot 8.
1 2 3 4 9 11 10 5 6 7 8
SRU SRU
SFU
0
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
0
1
2
3
4
1
2 3
4 5
6 7
8 9
10 11
12 13
14 15
16 17
18 19
20 21
22 23
24 25
26 27
28 29
30 31
32 33
34 35
36 37
38 39

20.  The SRU/MPU manages, monitors, and maintains the boards, fans,
and power modules.On the NE40E-X8, one independent SFU and
two SFU modules on the SRUs constitute three switching planes
that work in 2+1 load balancing mode.
 SFU has a control channel that provides the following functions:
 Detects voltage, current, and temperature.
 Provides protections against over-voltage, over-current,
and over-heating.
 There are three type LPU’s are installed in the CX600-X16 which
have 16 LPU slots.All service line cards are interchangeable.
 Only one 24xGE LPUs is installed in the Slot2
 three 10x10Ge LPUs are installed in slot6,slot8 and slot14.
 Two 2x40Ge LPUs are intalled in slot3 and slot7
 All the LPU type can be intall in from slot1 to slot 16.

21.  Switch Fabric Unit(SFU)
 The CX6DSFUI401B on the CX600-X16 switches data for the entire
system at line speed of 640 Gbit/s (320 Gbit/s for the upstream
traffic and 320 Gbit/s for the downstream traffic). This ensures a
non-blocked switching network.The CX600-X16 has four SFUs
working in 3+1 load balancing mode. The entire system provides a
switching capacity at wire speed of 2.56 Tbit/s.
 Main Processing Unit(MPU)
 The MPU consists of the main control unit, system clock unit, and
system maintenance unit.The MPU consists of a motherboard and
three pinch boards. The MPU controls and manages the system. As
the system clock source and the management and maintenance
unit, the MPU provides the functions of the control plane, switching
plane, and maintenance plane.

22. THANKS!