MobiHealth
Communication Infrastructure
Measurement strategy of E2E communication link
MobiHealth WP3 meeting
November 13, 2002
MobiHealth Team, University of Twente
email: [email protected]
Internet: www.mobihealth.org
Presentation layout
♦
Problem statement – identifying segments of the
communication link in E2E connection
♦
Possible scenarios of communication infrastructures
♦
Proposed measurement strategy
♦
Measurements’ assumptions & requirements
♦
Schedule of activities
Problem statement
Segments of communication link in E2E connection:
Sensor
MBU
(Mobile Base Unit)
BAN (internal)
e.g. Bluetooth
Enterprise
router
Internet Gate
Mobile Operator Network
Internet
Host
Enterprise
Network
(Intranet)
♦ Due to the fact that end-host cannot communicate directly with
the Sensor we consider:
E2E communication link:
MBU ↔ end-host
Problem scenarios for different wireless technologies
MBU
(Mobile Base Unit)
Sensor
Enterprise
router
Internet Gate
Mobile Operator
Network
BAN (internal)
e.g. Bluetooth
Enterprise
Network
(Intranet)
Internet
1. Applying 2.5G technology - GPRS
MBU
Base Station
Enterprise
router
GGSN
Host
BAN
2.5 technology - GPRS
wireless link
Internet
Enterprise
Network
(Intranet)
Host
Problem variants for different wireless technologies (cont.)
2. Applying WLAN plus 2.5G technologies – VTT scenario
MBU
VAN
access router/"gateway"
BS
Enterprise
router
GGSN
Host
BAN
2.5 technology
e.g. GPRS
WLAN
Internet
Enterprise
Network
(Intranet)
3. Applying 3G technology - UMTS
MBU
Base Station
Enterprise
router
GGSN
Host
BAN
3G technology - UMTS
wireless link
Internet
Enterprise
Network
(Intranet)
Proposed measurement strategy
♦ Firstly: delay, data loss, throughput characteristics of the E2E link
Due to the fact, that for now we don’t have an insight into the Mobile
Operator Network our measurement approach is as follows:
"black-box"
measurement
point A'
measurement
point A
"delay world"
"data loss world"
queue
queue
MBU
2..5 /
3G
wireless
Inet
Entrp.
Net
appl.
host
cumulative
+
wired link
"best effort"
measurement
point B
measurement
point B'
Proposed measurement strategy (cont.)
Proposed approach:
• Measurements between points A-A’; Derivation of delay, throughput,
data loss characteristics (distribution functions)
• Measurements between points B-B’, where part of the link A-A’ is a
“black-box”; derivation of B-B’ characteristics of the link as above
• Simulation of the whole E2E communication link (programming);
playing with the parameters derived from measurements:
MBU and Application host (e.g. changing the scheduling discipline)
and observing the influence for the E2E characteristics
• Conclusion is the theoretical model for the E2E communication link
♦ Secondly: service coverage, mobility support
These characteristics are specific for the Operator’s Network
and could be derived by means of measurements done with help of the
service providers – Mobile Operators…
Measurements’ assumptions & requirements
♦ Step-by-step derivation of system’s characteristics,
where each step is going deeper into the details of particular
segment
♦ High number of measurements (samples) to guarantee
the statistical correctness
♦ Access to the operator infrastructure to place measurement
probes
♦ Due to the fact, that at UT we have good communication
infrastructure – 2Gb/s pipe to the Internet – we need some kind of
average performance model of the Internet and Enterprise network
Schedule of activities
♦ Start date : December 1, 2002
♦ Literature study
♦ Problem definition phase (2 mth)
♦ Measurements phase (2 mth)
♦ Simulation phase (3 mth)
♦ Conclusion : theoretical model (2 mth)
November 1, 2003
…any questions ?