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Confidential – Version 1.6
PRISMA Telecom Testing at a glance
Page 1
Privately held company
Headquarters in Milan, Italy
Global company with subsidiaries
in France, China, Sweden,
Finland, US and local Partners
worldwide
R&D and Manufacturing in Milan
130+ collaborators – 90%
graduate (≈+10% annual growth
rate since 2004)
35 M€ group global turnover in
2015
PRISMA Telecom Testing is a
global company, offering
outstanding solutions and
expertise in the Mobile & Radio
Technologies Testing,
supporting all the major
Service Providers and Network
Vendors worldwide
Paolo Marini
Mail: [email protected]
Mobile +39 335 6525835
Skype id: marinipa2002
Confidential – Version 1.6
Company Overview
Page 2
Solutions
Testing solutions adopted globally in
many test labs of the largest Mobile
Infrastructure Vendors and Service
Providers – more than 30% of 4G LTE
networks are developed and tested using
PRISMA technologies
Simulation, test automation and monitoring
solutions available for wireless radio and
wired interfaces
Dense-network testing, load tests, QoS
analysis, latency verification, MOS score
evaluation on large number of simultaneous
calls
Simple but Effective User Interface enable
users to reduce testing time and complexity
Alliances with major technological players
to develop new systems based on
upcoming standards (5G, MTC, IoT, NB-
IoT)
Expertise
Complex HW design, including RF, DSP,
FPGA
4th iteration of a, multi technology SDR
platform designed for high performances
FW e BSP software
Operating system for highly responsive/real
time applications
Layer 1/baseband development skill for
GSM/WCDMA and LTE to implement a
complex multi terminal UE for testing
purposes
Development of MAC, RLC, PDCP
protocols with highest performance targets
RRC & NAS protocols development for
multi terminal simulation
Customization of Wireshark for new
telecom protocols
Confidential – Version 1.6
Prisma’s Portfolio Overview
WIRELESS
Test Systems
Multi-UE Simulators
SDR Platform
Page 3
WIRED
Test Systems
LSU Line Server Unit
Simulation and Monitoring
UMTS
Iub,Iu,Iur
ATM, IP
GSM
Abis,A,Gb
TDM, IP
LTES1,X2
IP
Vertical
Solutions
Emergency
NET
Confidential – Version 1.6
`
Load-Stress Test of Massive Handovers
for LTE System in High Speed Trains
Ali Parichehreh, Umberto Spagnolini, Paolo Marini, Alberto Fontana, Paolo Timelli
A joint work between Prisma Telecom Testing and Politecnico di Milano, Milano, Italy.
ObjectivesIn-lab experiment to investigate the performance of
eNBs with linear topology coincident with train-track
network plan and massive on-board UEs.
Characterizing the impairment effects of massive
load on the end users QoS on a commercial LTE
Base Station using real IP applications and voice
Handover induced latency
Throughput reduction
Optimization on the Base Station implementation
Method
Results
Results
Conclusions
Effect of massive users on the HO intruption time
Effect of massive users on the on-board throughput
Results highlight that Exponential functions can be
fitted to the HO-induced latency with scaling parameter
depending on the number of on-board UEs.
We observed that HO-induced latency increases up to
1s for 120 UEs at 300km/h, causing TCP
disconnection and drastic throughput degradation with
a cell-periodic behavior.
Experimental results (without considering Doppler
effect) provide a reference QoS measurement
approach based on the UEs density and the specific
Base Station manufacturer.
0 200 400 600 800 1000 12000
0.2
0.4
0.6
0.8
1
t= RRCcomplete
-RRCconfig
[ms]
EC
DF 4x4
8x4
15x4
18x4
22x4
30x4
10x4
8x4 15x4 18x4 22x4 30x44x4 10x4
8x4 UEs (L1 relay)
0
a)
HO transition
100
Ave
rage
Thr
ough
put
[Mbp
s]
a) 8x4 UEs (L1 relay)
100
Ave
rage
Thr
ough
put
[Mbp
s]
30x4 UEs (L1 relay)
0
b)
HO transition
HO transition
-5 0 +5Time (s)
-10 +10
D=1km
D=1km Moving direction v=300kmph
eNB1 eNB2 eNB3 eNBK
PHY
UE N
PHY
MAC
MAC
MAC
MAC
MAC
MAC
UE 1
UE 2
UE N
UE 1
UE 2
PHY level
settings
BB InterfeNodeB
cable
eNodeB
Cell k
Cell k+1
LTE HO procedure
On-board UEs
UE1 –CH2
UE1-CH1
UE2 –CH2
UE2-CH1
UE2 –CH2
UEN-CH1
UE1 (TCP
connection)
UE2 (TCP
connection)
UEN TCP
connection)
Tra
ffic
an
aly
sis
(QoS
, th
roughput)
eNB
port 1
port 2
cable
eNB
UE1 (TCP
connection)
UE2 (TCP
connection)
UEN (TCP
connection)
PD
CP
RLC
MA
C
PD
CP
RLC
MA
C
PD
CP
RLC
MA
C
(L1-L3) PHY
Simulated group of UEs via
UeSIMLTE eNB & EPC FTP serverWireshark
Ethernet Uu,Un SGi
Mu
ltiu
ser
traff
ic
gen
era
tor
(vid
eo,
HT
TP
, F
TP
)