1. CH6 Deploying in the Field
Wireless Sensor Networks for Healthcare Applications
RTLab. Master candidate
Jae hoon, Woo

2. Contents
Introduction
Deployment Phase
Field Experience

3. Introduction
The deployment of the wireless sensor network into the home of the subject is the final step in the process.
The deployment phase involves the engineer having a high degree of contact with the subject
The relationship between the engineer and the elder is a recurring theme in this chapter

4. Introduction
The deployment of the WSN can be broken down into the following stages:
Planning
Testing
Preinstall
Installation
Maintenance
Teardown
*The material in this chapter is informed by several real-world projects in which the authors were actively involved.

5. Planning. Testing. Preinstall. Installation. Maintenance. Teardown
Planning Testing Preinstall Installation Maintenance Teardown Field Experience

6. Planning
The focus of the planning stage is to prepare for the installation of a single example of the network into a single home.
The overall system architecture and components
The specifics of the environment into which the installation will take place

7. Planning The plan should include: complete list
Environmental sensor / actuator devices;
Wearable devices;
Portable devices;
Aggregators;
Servers(if any);
Network interface (in any);
Specification
Description
Floor plan
Timescale
Contact details for the subject

8. Testing
It is crucial that all technology is fully tested before going on-site to carry out the install.
The plan should include:
On the bench;
In the lab;
In a friendly environment, such as the home of a team member;
In a suitable built environment – Ethical Review and Labeling (similar in architecture and construction to the install location);
With participant representative groups in their homes (this is referred to as premarket testing).

9. Testing On the bench; Focuses initially on the individual devices
The devices may be prototypes made up of combinations of modules and test boards.
The test plan consists of multiple test
Typical test topics
Radio functionality
Power management
Battery capacity
Memory
Actuator elements(lights, screens, LEDs)
Sensor functionality(movement, temperature, etc)

10. Testing
2. Lab Testing
A mock-up of a typical deployment environment should be used to carry out laboratory testing
The object : to ensure that devices, and the system as a whole,
Function as expected in an area approximately the same size and shape as a typical deployment location.
The devices act this stage will typically be example PCBs

11. Testing 2. Lab Testing Key issues to test in the lab include:
Communications between devices and aggregators, including radio range and interference effects;
Data flow, storage, and management;
The ability of the aggregator to handle multiple parallel streams of heterogeneous data;
Monitoring and maintenance software
Impact of furniture, human occupancy, and other features of the environment on the functionality of the system.

12. Testing 3. Friendly Environment Test
A real-world(out of lab) deployment environment
Purpose : to assess the system in a “real-world-like” environment over a protracted period.
Long-term stability of hardware and software;
Long-term communications and data capture functionality;
Architectural and built environment factors, particularly in terms of their effect on radio communications and sensor function;
Impact of furniture, microwave ovens, and other sources of radio waves(e.g., WiFi networks);
Impact of heat, cold, humidity, and other environmental factors;

13. Testing 4. Ethical Review and Labeling
At this stage, the technology is ready to be deployed outside the controlled environment, and to become “customer-facing” for the first time.
Object : to apply medical ethics guide-line(FDA, EU, etc.) to the testing to ensure that the users who are involved in the testing will
not exposed to harm

14. Testing 5. Premarket Testing
The final stage of testing involves installing and running the entire system in the homes of a number of subjects.
Object : to identify usage issues and technical issues that have not arisen in the laboratory or friendly environments.
During premarket testing, the full deployment process, form planning to teardown, is carried out, just as it will be when the system is finally deployed in the field

15. Testing 6. Documentation
All stages in the testing should be fully documented by the test team, and made available to the deployment teams on the project.
These reports can act as FAQ list and as guidance to the deployment teams
Note that when devices are replaced or modified during the course of the project, they should be fully tested before being installed.

16. Preinstall
Before actually traveling to the home of the subject and installing the WSN
The aim of this phase is to make the following phase as smooth as possible.
Contact the subject and agree the data and time for installation.
Build the entire hose WSN, include aggregator and sever, in the lab. And run it overnight before the installation
Prepare an install pack, with the full set of technology, plus spares.

17. Installation Important factor : It is “customer facing”
Introduce the team and remind the subject of recent contact.
Discuss the ideal locations for sensors with the subject, and seek agreement on location.
Locate and identify studs and other construction elements that impact on sensor location
Agree on a location for the aggregator.
Agree on the power supply
Bear in mind the need for access for maintenance purpose
Mark the locations of all elements with removable markers and agree on them with the subject.
Install the device, aggregator, and so forth
Verify that the WSN is operating as intended, using the online maintenance/monitoring software
Check that data is being generated and collected as intended
..…

18. Maintenance
It should also be monitored on an ongoing basis, in order to verify that it is functioning as planned. The us of maintenance software Issue-tracking software such as BugZilla or Mntis Should ensure that data is being collected, stored, and backed up according to plan.

19. Teardown
To minimize the mess, noise, and impact of the removal process, and to leave the subject.
Agree and adhere to the appointment
Minimize time and impact of teardown process
Ensure that décor is unaffected
Provide subject with ongoing contact detail
Explain whether/what other followup may occur
Give opportunity for feedback

20. Field Experience Planning Choice of Radio Installation
Building Materials
Participant Test
Human Frailty
Fluorescent Lamps and Infrared