MobiHealth Communication Infrastructure

Measurement strategy of E2E communication link

MobiHealth WP3 meetingNovember 13, 2002

MobiHealth Team, University of Twenteemail: mhealth@mobihealth.orgInternet: 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:

SensorMBU

(Mobile Base Unit) Internet Gate

Enterpriserouter Host

BAN (internal)e.g. Bluetooth Mobile Operator Network Internet

EnterpriseNetwork(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

1. Applying 2.5G technology - GPRS

SensorMBU

(Mobile Base Unit) Internet Gate

Enterpriserouter Host

BAN (internal)e.g. Bluetooth

Mobile OperatorNetwork

Internet

EnterpriseNetwork(Intranet)

Problem variants for different wireless technologies (cont.)

3. Applying 3G technology - UMTS

2. Applying WLAN plus 2.5G technologies – VTT scenario

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:

MBUappl.hostInet

queue queue

"black-box"

cumulativewireless + wired link

"best effort"

measurementpoint A'

measurementpoint A

measurementpoint B

measurementpoint B'

2..5 /3G

"delay world" "data loss world"

Entrp.Net

Proposed measurement strategy (cont.)

♦ 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…

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

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 ?