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WSB / MobiHealth
Hugo Geuverink
MobiHealth WP3 meeting 12/13 November 2002, Madrid
filename / 2© 2001 / www.cmg.com
Agenda
• Scenario nr. 1
• Scenario nr. 2
• Advantages of Wireless Service Broker
• Benefits of WSB / WAP 2.0
• TCP / UDP / W-TCP: advantages / dis-advantages
• Conclusion
filename / 3© 2001 / www.cmg.com
GGSN - WSB configured Connectivity
AppServerSensor
Fron
t-En
d
BT
MBU
WirelessServiceBroker™
GPRS/UMTS
Internet
FirewallFirewall
SGSN
GGSN VPN
filename / 4© 2001 / www.cmg.com
GGSN
WSB
RADIUSD
Fix IP
nr
GGSN
Fix IP
nr
WSB
TCP/IP (IP nr client)
Radius info MSISDN + Username + Password
Subscriber DB.
Authorization
Authentication
GGSN - WSB configured Connectivity
filename / 5© 2001 / www.cmg.com
Advantages GSN - WSB configured Connectivity
• Use of VPN infrastructure
• Easier to achieve
• Cheaper to achieve
• Easier to maintain
• Radius Forwarding accounting
• Easier and more secure Authentication
• Separation of different operators subnets by Virtual GW’s
filename / 6© 2001 / www.cmg.com
Disadvantages GGSN - WSB configured Connectivity
• Operators have to accept (Operator dependent solution)
• Wan’t work in visited networks
filename / 7© 2001 / www.cmg.com
Agenda
• Scenario nr. 1
• Scenario nr. 2
• Advantages of Wireless Service Broker
• Benefits of WSB / WAP 2.0
• TCP / UDP / W-TCP: advantages / dis-advantages
• Conclusion
filename / 8© 2001 / www.cmg.com
NO GGSN - WSB configured Connectivity
AppServerSensor
Fron
t-En
d
BT
MBU
WirelessServiceBroker™
at Hospital
side
GPRS/UMTSIntern
et
Firewall
filename / 9© 2001 / www.cmg.com
Surrogate
MBU
Secure HTTP
Jini Lookup Service
End UserApplication
Surrogate Host
MobiHealth domain
E-Health domain
Data Repository
WirelessServiceBroker
Surrogate Host / WSB
SecureHTTP
Firewall
filename / 10© 2001 / www.cmg.com
HOSP
WSB
RADIUSD
Radius info MSISDN + Username + Password from
Hospital
Subscriber DB.
Authorization
Authentication
Radius info from Hospital
filename / 11© 2001 / www.cmg.com
Advantages NO GGSN - WSB configured Connectivity
• End to End security
• Radius info will be get from Hospital and MBU
• No radius forwarding
• Global solution => Non operator independent
• Only roaming agreement needed
filename / 12© 2001 / www.cmg.com
Disadvantages NO GGSN - WSB configured Connectivity
• No Radius forwarding => only Proxy authentication
• Athentication more complex
• No added-value from operators
filename / 13© 2001 / www.cmg.com
Advantages WSB / Surrogate Host, Hospital side
• Central Authentication / Authorization (Patient, Doctor…)
• Maintain Subscriber DB
• Hospital by Virtual gateway and seperate DB
• Radius info from Hospital
- MSISDN
- Username
- Password
• Firewall function for Internet Traffic
filename / 14© 2001 / www.cmg.com
Disadvantages WSB / Surrogate Host, Hospital side
• No Radius info from Operator
filename / 15© 2001 / www.cmg.com
Advantages MBU / WSB
• W-TCP protocol
• Secure HTTP
• Application level security
• Only body encrypted
• Information in Header usable
filename / 16© 2001 / www.cmg.com
Disadvantages MBU / WSB
• WSB has to ask MBU for Username/Password for authentication and authorization
• Username / Password maintenance
filename / 17© 2001 / www.cmg.com
Agenda
• Scenario nr. 1
• Scenario nr. 2
• Advantages of Wireless Service Broker
• Benefits of WSB / WAP 2.0
• TCP / UDP / W-TCP: advantages / dis-advantages
• Conclusion
filename / 18© 2001 / www.cmg.com
Advantages of the Wireless Service Broker (1)• Optimized connection between BAN, WSB and Hospital
• Wireless TCP
• Cost saving for subscriber (patient)
• Central Authentication and Authorization
• Broker management facility
• Statistics
• Services
• Profiles
• Differentiation over Billing (Hospital / Insurance company / Patient)
filename / 19© 2001 / www.cmg.com
Advantages of the Wireless Service Broker (2)• Push capability
• Surrogate Host => MBU
• Activate when MBU in sleep mode
• Deliver control information when device available
• Device always reachable
• Push over IP, when no connection, Session Initiation Request
• Support of all Bearers
• Surrogate Host => Doctor (notification message)
filename / 20© 2001 / www.cmg.com
Advantages of the Wireless Service Broker (3)• Out of coverage (WAP standard)
• PPG stored data (control information) until MBU is alive
• PPG = Push Proxy Gateway
• Firewall function for Internet traffic
• Maintain Subscriber DB by Virtual Gateway
• Replication of solution possible on same platform via Virtual Gateway’s
• Scalability
• WAP 2.0 Standard
filename / 21© 2001 / www.cmg.com
Agenda
• Scenario nr. 1
• Scenario nr. 2
• Advantages of Wireless Service Broker
• Benefits of WSB / WAP 2.0
• TCP / UDP / W-TCP: advantages / dis-advantages
• Conclusion
filename / 22© 2001 / www.cmg.com
Benefits of WSB / WAP 2.0
• Update of WAP to be 3G-ready
• W-TCP instead of UDP / TCP
• No protocol conversion in WAP 2.0 (better security)
• End to End security (secure HTTP) in both ways !
• Richer mark-up languages tailored for mobiles, with improved support for:
• Color
• Image formats, including color images
• Style sheets
• Important when status request from Content server > Patient
filename / 23© 2001 / www.cmg.com
Agenda
• Scenario nr. 1
• Scenario nr. 2 (proposal)
• Advantages of Wireless Service Broker
• Benefits of WSB / WAP 2.0
• TCP / UDP / W-TCP advantages / dis-advantages
• Conclusion
filename / 24© 2001 / www.cmg.com
TCP advantages / disadvantages
• Advantages:
• Reliable, all data will be send
• Data packages in right order
• Disadvantages:
• Bad performance due to resending mechanisme
• Whole window will be send again
• Slow initial congestion
• Influence of network behaviour
filename / 25© 2001 / www.cmg.com
UDP advantages / disadvantages
• Advantages:
• Better performance
• Disadvantages:
• Not Reliable, not all data will be received
• One or more packages (even >50%) of data could be lost
• Create retry mechanisme
• Packages received in different order
• Create mechanisme to set packages in right order
• WAP 1.x standard
• Influence of network behaviour
filename / 26© 2001 / www.cmg.com
W-TCP advantages / disadvantages
• Advantages:
• Reliable
• Retry mechanisme, only lost packages will be send again
• Initial congestion better by configuration of parameter cwnd
• Better performance then TCP
• Wireless Serice Broker support W-TCP
• MBU (Linux) support W-TCP
• WAP 2.0 standard
• Disadvantages:
• Influence of network behaviour
filename / 27© 2001 / www.cmg.com
Agenda
• Scenario nr. 1
• Scenario nr. 2 (proposal)
• Advantages of Wireless Service Broker
• Benefits of WSB / WAP 2.0
• TCP / UDP / W-TCP advantages / dis-advantages
• Conclusion
filename / 28© 2001 / www.cmg.com
Conclusion
• Proposal CMG
• Scenario 2 (WSB at Hospital side, no GGSN – WSB configuration, W-TCP and secure HTTP)
• Central Authorisation / Authentication
• Push Capability
• Maintain subscriber DB by Virtual Gateway
• Replication on same platform via Virtual Gateway
• Global solution
- No radius info from operator
- No configuration at GGSN
• Firewall function Internet traffic
filename / 29© 2001 / www.cmg.com
QUESTIONS ?