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Bluetooth 2.1 Based Emergency Data Delivery System in HealthNet. Seung-Hoon Lee, Sewook Jung, Alexander Chang, Dea-Ki Cho, and Mario Gerla Network Research Lab Department of Computer Science University of California, Los Angeles. Outline. Overview of wireless networks in HealthNet - PowerPoint PPT Presentation
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Seung-Hoon Lee, Sewook Jung, Alexander Chang, Dea-Ki Cho, and Mario Gerla
Network Research LabDepartment of Computer Science
University of California, Los Angeles
Overview of wireless networks in HealthNet Bluetooth networks in HealthNet A new protocol using BT 2.1 Simulation Conclusion
Interests in health care considerably increased BodyLAN based wireless sensor platforms Monitoring patient status
Sensor
Network
Wireless networks for cable replacement
Sensor
Wireless networks for cable replacement◦ Issues: Small, cheap, power efficient◦ Wi-fi, ZigBee, Bluetooth
Sensor
Bluetooth◦ Small enough being attached on sensors◦ Cheap, power efficient◦ Widely being used – Most of cell phone, laptop
Issues◦ Long connection delay
Connection establishment: 5 ~ 10 seconds◦ Causes severe problem on time critical applications (i.e., emergency health applications)◦ BT cannot be utilized for EMERGENCY uses.
Bluetooth 2.1◦ Recently published (July 2007)◦ Introducing new enhancement features
Customizing two new features of BT 2.1◦ EIR (Extended Inquiry Response)◦ SSP (Secure Simple Pairing)
Bluetooth 2.1◦ Recently published (July 2007)◦ Introducing new enhancement features
Customizing two new features of BT 2.1◦ EIR (Extended Inquiry Response)
Original purpose: Inquiry Response message Propagating emergency data
◦ SSP (Secure Simple Pairing) Original purpose: security mechanism for data Protecting EIR data
Comparison of data dissemination stages◦ Bluetooth 2.0
Peer discovery: Find other peers within the communication range Paging: Connection setup Connection established: Data delivery
◦ Bluetooth 2.1 Peer discovery
Bluetooth 2.0
Master
Inquiry
InquiryResponse
Slave
Inquiry Response
Page
PageResponse
Page Response
InquiryScan
Page Scan
Master Response
SlaveResponse
Slave Response
Peer Discovery Paging Procedure
Data Delivery
Tx slot Rx slot Tx slot Rx slot Tx slot Rx slot
Tx slotRx slot Tx slot Rx slot Tx slot Rx slot
Inquiry Page Master Response
Connected
Bluetooth 2.0◦ Peer Discovery
Master
Inquiry
InquiryResponse
Slave
Inquiry Response
Page
PageResponse
Page Response
InquiryScan
Page Scan
Master Response
SlaveResponse
Slave Response
Peer Discovery Paging Procedure
Data Delivery
Tx slot Rx slot Tx slot Rx slot Tx slot Rx slot
Tx slotRx slot Tx slot Rx slot Tx slot Rx slot
Inquiry Page Master Response
Connected
Inquiry
Bluetooth 2.0◦ Peer Discovery
Master
Inquiry
InquiryResponse
Slave
Inquiry Response
Page
PageResponse
Page Response
InquiryScan
Page Scan
Master Response
SlaveResponse
Slave Response
Peer Discovery Paging Procedure
Data Delivery
Tx slot Rx slot Tx slot Rx slot Tx slot Rx slot
Tx slotRx slot Tx slot Rx slot Tx slot Rx slot
Inquiry Page Master Response
Connected
Inquiry
Bluetooth 2.0◦ Peer Discovery
Master
Inquiry
InquiryResponse
Slave
Inquiry Response
Page
PageResponse
Page Response
InquiryScan
Page Scan
Master Response
SlaveResponse
Slave Response
Peer Discovery Paging Procedure
Data Delivery
Tx slot Rx slot Tx slot Rx slot Tx slot Rx slot
Tx slotRx slot Tx slot Rx slot Tx slot Rx slot
Inquiry Page Master Response
Connected
InquiryResponse
Bluetooth 2.0◦ Paging
Master
Inquiry
InquiryResponse
Slave
Inquiry Response
Page
PageResponse
Page Response
InquiryScan
Page Scan
Master Response
SlaveResponse
Slave Response
Peer Discovery Paging Procedure
Data Delivery
Tx slot Rx slot Tx slot Rx slot Tx slot Rx slot
Tx slotRx slot Tx slot Rx slot Tx slot Rx slot
Inquiry Page Master Response
Connected
Exchange device informationChannel synchronization
Bluetooth 2.0◦ Connected
Master
Inquiry
InquiryResponse
Slave
Inquiry Response
Page
PageResponse
Page Response
InquiryScan
Page Scan
Master Response
SlaveResponse
Slave Response
Peer Discovery Paging Procedure
Data Delivery
Tx slot Rx slot Tx slot Rx slot Tx slot Rx slot
Tx slotRx slot Tx slot Rx slot Tx slot Rx slot
Inquiry Page Master Response
Connected
Connection establishedData delivery
Bluetooth 2.1◦ Peer Discovery
Inquiry
InquiryResponse
Master
Inquiry
Inquiry
Slave
Inquiry Response
InquiryScan EIR
Tx slot Rx slot
Data Delivery
1250us
Rx slot Tx slot
Peer discovery Data Delivery
Bluetooth 2.1◦ Peer Discovery
Inquiry
InquiryResponse
Master
Inquiry
Inquiry
Slave
Inquiry Response
InquiryScan EIR
Tx slot Rx slot
Data Delivery
1250us
Rx slot Tx slot
Peer discovery Data Delivery
Bluetooth 2.0◦ EIR Data Delivery
Data delivery
InquiryResponse
Master
Inquiry
Inquiry
Slave
Inquiry Response
InquiryScan EIR
Tx slot Rx slot
Data Delivery
1250us
Rx slot Tx slot
Peer discovery Data Delivery
EIR based data delivery◦ Connectionless◦ Not protected by BT Security mechanisms
Secure Simple Pairing (SSP)◦ Customizing SSP procedures◦ Protecting EIR data
◦ PKI based security method◦ Keys generated by SSP stages◦ Encrypt/Decrypt EIR data with the keys
Simulation◦ NS2 + UCBT + BT 2.1 implementation
UCBT: Bluetooth simulation module UCBT not supporting BT 2.1 ( BT 2.1 recently published)
HealthNet Scenario◦ Patient monitoring system without any network infrastructure.◦ Emergency data delivered by Peer-to-Peer overlay◦ Three different nodes:
Patient: Emergency data source (static) Nurse: Delivering data by P2P (mobile) Data Collector: Collecting data (static)
Patient
Body Sensors
Nurses (Mobile)
Collection Center
peer-to-peer
HealthNet Scenario◦ Patient monitoring system without any network infrastructure.◦ Emergency data delivered by Peer-to-Peer overlay◦ Three different nodes:
Patient: Emergency data source (static) Nurse: Delivering data by P2P (mobile) Data Collector: Collecting data (static)
Patient
Body Sensors
Nurses (Mobile)
Collection Center
peer-to-peer
HealthNet Scenario◦ Patient monitoring system without any network infrastructure.◦ Emergency data delivered by Peer-to-Peer overlay◦ Three different nodes:
Patient: Emergency data source (static) Nurse: Delivering data by P2P (mobile) Data Collector: Collecting data (static)
Patient
Body Sensors
Nurses (Mobile)
Collection Center
peer-to-peer
HealthNet Scenario◦ Patient monitoring system without any network infrastructure.◦ Emergency data delivered by Peer-to-Peer overlay◦ Three different nodes:
Patient: Emergency data source (static) Nurse: Delivering data by P2P (mobile) Data Collector: Collecting data (static)
Patient
Body Sensors
Nurses (Mobile)
Collection Center
peer-to-peer
Our protocol using BT 2.1 works a lot better than the conventional scheme
Number of nodes: VariousNode Speed: 1 m/sArea: 50x50 m2
Our protocol using BT 2.1 works a lot better than the conventional scheme
Number of nodes: 30Node Speed: 1 m/sArea: Various
Resolving a connection delay problem of Bluetooth devices in HealthNet with keeping the same security level◦ Customizing EIR and SSP
Simulation results confirm the improvement of BT 2.1 based data delivery◦ Delay and Power Consumption
Bluetooth devices are applicable for emergency applications in HealthNet
Questions?
