SURVEY FOR WIRELESS SENSORS

IN HEALTHCARE

Presented by Bharat Soundararajan

OUTLINE

• INTRODUCTION• PROPOSED PROBLEMS• NETWORKS FOR HEALTHCARE• MEDIC AND ITS ALGORITHM• DIFFERENT TYPES OF TOPOLOGIES• FUTURE

INTRODUCTION

• Patients need continuous monitoring of their health conditions

• Various vital and health care data are collected using sensors and sent to the hospital

Proposed Needs

• Low complexity

• Low cost

• Data reliability

• Low power consumption

Different networks for healthcareWLAN (802.11)

Bluetooth-based WPAN (802.15.1)

ZIGBEE(802.15.4)

Range 100m ~10-100m ~10m

Cost/complexity >6 1 0.2

Power consumption

Medium Low Ultralow

Size Larger smaller smallest

MEDIC

• Acquire data from patients in real world• It sends data to the centralized server

and the centralized server forwards data to all the nodes

• It can be configured from the remote server

• Wearable sensors to patients for comfort ability

MEDIC

INTERNET

MEDICAL

PERSONAL

ZIGBEE or BLUE TOOTH

What is ZigBee??ZigBee technology is a low data rate, low power

consumption, low cost, wireless networking protocol targeted towards health care

Zigbee Alliance introduced Zigbee standard protocol in 2003

ZigBee is a technological standard, based on the IEEE 802.15.4 standard, which was created specifically for control and sensor networks.

The Zigbee Protocol Stack

What is ZigBee??

• As can be seen in the figure, IEEE 802.15.4 develops the Medium Access Control (MAC) Layer and Physical (PHY) Layer, which address such things as the frequency and data rate specifications.

• ZigBee develops the Network Layer and Application Layer, which includes the Applications Support Sub layer, the ZigBee Device Object, and the Security Services.

BAYESIAN NETWORK ALGORITHM

• A set of variables independent of each other• The probability of these variables influence

the output• Symptoms are used to determine whether a

person has a disease• This is trained by the previous data used for

the treatment

BAYESIAN NETWORK ALGORITHM

DISEASE

PULSE RATE OXYGEN LEVEL BODY TEMPERATURE BLOOD PRESSURE

PROBLEM WITH MULTIHOP

PAN coordinator

Full Function Device

Cluster Tree

Reduced Function Device

Timezone CoordinatedSleep Scheduling Algorithm (TICOSS)

• coordinated sleeping through the division of the network into time zones• The time zones also provides coordinated

sleeping, through the V-table scheduling• The scheduling table allocates timeslots to

nodes in order to assign periods of node activity and inactivity

Topology Models

15

PAN coordinator

Full Function Device

Reduced Function Device

Star

Mesh

Cluster Tree

TOPOLOGY MODELS

• It manages all the sensors inside the network• It collects information from all the nodes and

forwards it to the centralized server

TOPOLOGY MODELS

Fully functional device Any topology fits for fully functional device It can also act as a network coordinator, network

router

Reduced functional device It only fits perfectly for reduced functional device It cannot act as a network administrator

Future???ZigBee is seen as a key technology for home

automation and sensor networks, but its characteristics can be extremely valuable in some healthcare applications as well.

On July 24-27, 2006 in the Free scale Technology Forum, Orlando, FL, the wireless developer Cambridge Consultants demonstrated how ZigBee's unique networking attributes can be exploited to implement networks for healthcare.

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