The Transmission Performance Evaluation of Remote Healthcare Data over Secure Satellite Network

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:2007 8 3 , :2008 7 29

: , 134 (120-749)

Tel:02-2228-1919, Fax:02-363-9923, E-mail:sunkyoo@yuhs.ac

* 2007 . ( : 02-PJ3-PG6-EV08-0001).

위성 보안 네트워크 기반의 의료 데이터 전송성능 평가

1,3 , 2,3, 2,3, 1,3, 4 연세대학교 생체공학 협동과정1 _{연세대학교 의과대학 의학공학교실} , 2, 이동형 응급의료정보시스템 개발센터3 _{연세대학교 의과대학 응급의학교실} , 4

The Transmission Performance Evaluation of Remote Healthcare Data

over Secure Satellite Network

Dong kyu Lim1,3, Sun K. Yoo2,3, Dong keun Kim2,3, Jung chae Kim1,3, Min hong Choa4

Graduate School of Biomedical Engineering, Yonsei Univ1, Dept. of Medical Engineering, Yonsei Univ. College of Medicine2,

Center for Emergency Medical Informatics3,

Dept. of Emergency Medicine, College of Medicine, Yonsei Univ.4

Abstract

Objectives: We have not only examined telemedicine scenario but also applied IPSec(AH, ESP) algorithms under VPN(Virtual Private Network) for performance evaluation of telemedicine system's security and transmission. Methods:

In this study, we applied IPSec(AH, ESP) algorithms under VPN(Virtual Private Network) protocol when transmit healthcare data through Satellite Network. At that time, we evaluated performance of telemedicine system through RTT(Round Trip Time), Jitter, Bandwidth that indicate to QoS(Quality Of Service). Results: It is possible to transfer remote healthcare data over Satellite Network under provided image of 15 frame and bio-signal of 10 kbps and RTT(Round Trip Time) of 774.53ms, Jitter of 25.2ms. But applying IPsec(AH, ESP) under VPN(Virtual Private Network), it is frequently happened distortion of image data affected SHA-1 and 3DES algorithm. Conclusion: In this study, it is possible to use telemedicine system for Secure Satellite Network, but demand to be based QoS(Quality Of Service) limited. We expected that it is possible to use the designed system in the disaster area. (Journal of(Journal of(Journal of(Journal of

Korean Society of Medical Informatics 14-4, 439-449, 2008) Korean Society of Medical Informatics 14-4, 439-449, 2008) Korean Society of Medical Informatics 14-4, 439-449, 2008) Korean Society of Medical Informatics 14-4, 439-449, 2008)

Key words: Telemedicine, Satellite, IPSec, Healthcare Data, QoS 원저

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서론

.

..

.

Ⅰ

. , 1-5) . , . IP , IP . , , 6) .

Secure Virtual Private Network (VPN) IPsec . .

재료 및 방법

.

..

.

Ⅱ

1. 2 2 36,000Km

(Geo-stationary Earth Orbit) 24 . 36,000Km 43% , 3 (Fig. 1). Ku-band 400Kbps~3Mbps (Table 1). 768Kbps . ,

RTT(Round Trip Time) 700ms 7-9). Table 1. Specifications of Satellite Network

Orbit the 116th degree of east longitude(35.786Km)

Weight 1.464Kg

Lunch Day 1996. 1. 14

Manufacture Co. Lockheed Martin Astro Space(LMAS) Lunch Service Co. McDonnell Douglas

Band Ku band(12~14Ghz)

Bandwidth 400Kbps~3Mbps_{(Suwon Control Tower:768Kbps)}

RTT 700ms

Figure 1. Geostationary earth orbits

2. IPSec

(1) (Virtual Private Network) VPN(Virtual Private Network)

,

, ,

. VPN

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.

2 (L2TP, Layer 2 Tunneling) 3 (Layer 3 Tunneling) .

. 3

IPSec IETF(Internet Engineering Task

Force) IP

, , , IPv4

10-12) .

(2) IPSec (Internet Protocol Security)

IPSec SA(Security

Association), AH(Authentication Header), ESP(Encapsulation Security Payload) .

AH (Access Control),

(Connectionless Integrity), IP

(Data Origin Authenti-cation) , (Anti-Replay) . (Sequence Number) , . , AH IP (Immutable Field) .

‘0’ ICV(Integrity Check Value) . ESP AH (Confidentiality) 13-15) . Figure 2 IPSec .

(Transport Mode) TCP/UDP

, (Tunnel

Mode)

. IPSec AH, ESP

IP . 16) 3. Figure 3 (SNG, Satellite News Gathering) , , .

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(1) , , . TCP/IP , UDP . (Table 2). 1) . 720×480 1 30 .

MPEG4(Moving Picture Experts

Group 4) Xvid UDP

. 2) , , , . MFER . MFER JAHIS(Japanese Association of Healthcare Information Systems Industry)

. MFER . , , , 17-18) . 3) X-ray CT DICOM . DICOM Version 3.0 , , . DICOM 3.0 Figure 2 , . , ,

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. 19-21) . 4) . H.263 174×144 QCIF(Quater

Common Intermediate Format) 30

. GSM 6.10

. Table 2. Specifications of Healthcare Data

Transmission Type Correlation Time

High Quality Video UDP Real-Time

Bio Signal TCP/IP Real-Time

Radiograph TCP/IP Non Real-Time

Video Conference UDP Real-Time

Audio Conference UDP Real-Time

(2) . 4. (1) . . Figure 4 VPN IPSec 22-23) . (2) IPSec IPSec AH ESP (Table 3). AH IP MD5 SHA-1 ESP ESP MD5 SHA-1 , AH ESP . ESP 3DES AH IP ESP . 3DES IP ESP . AH, ESP , 3DES 23-24) .

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결과

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..

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Ⅲ

1. VPN IPSec

Figure 5 IPSec Utilization

. AH MD5 SHA-1 ESP MD5 SHA-1 IPSec 2% . SHA-1 . 128 MD5(Message Digest) 160 SHA-1(Secured Hash Algorithm)

, 32 SHA-1 . AH 1 , ESP 3DES 1 Utilization . AH ESP 1 , AH

24Byte , ESP 3DES

24 Byte 48Byte

IPSec . Utilization

4.8~4.9% . Case 7 8 ESP

3DES .

36Byte , 12Byte , 24Byte

(Encryption) . Case 9~12 ESP , AH . 3 . , AH 24Byte , ESP 36Byte 60Byte . 9~12 6% , , MD5 SHA-1 0.1~0.2% .

Figure 7 IPSec RTT Jitter

. IPSec RTT Jitter . MD5, SHA-1, 3DES RTT IPSec 0.38ms Jitter 0.045ms . Case AH ESP

MD5 SHA-1 MD5 SHA-1 3DES

1 2 3 4 5 6 7 8 9 10 11 12 Non-IPSec

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Figure 5.Utilization on the Case

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2. VPN IPSec AH(SHA-1)+ESP(3DES) . Figure 7 IPSec . IPSec 3,2%~6% AH ESP 24Byte 48Byte . RTT Jitter Figure 8 . IPSec RTT Jitter 774.53ms, 25.2ms . , IPSec AH 64bit 3DES

Figure 7.Throughput of Telemedicine through the Satellite Network

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RTT Jitter . IPSec AH, ESP , Figure 9 AH , ESP 3DES 64 . . Figure 10 . , , .

고찰

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..

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Ⅳ

, , . . .

Figure 9.Factors of Latency

(a) IPSec (b) Non-IPSec

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25) . . . Jitter , , . . QoS

(Resolution) (Color depth) .

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