1. Problem
   1. Redundant visits
   2. Prolonged call returns
   3. Patient requests are not widely accessible
2. Opportunity
   1. Current systems operate separately, not as one
   2. Current systems do not solve the problem
3. Significance
   1. Impact on healthcare
   2. Communication between patient and nurses
   3. Contextual info for HCI
   4. Increase patient satisfaction
4. Existing solution
   1. Flashing lamp call system
   2. Pager system
      1. Does not eliminate unnecessary visits
      2. does not increase care efficiency
   3. Mobile phones
5. Proposed solution: Nurse wireless location system
   1. Nurse Call System Software (NCSS)
      1. Handle Calls from nurse call hardware
      2. Sends ALERT to WPSS
   2. Location System Software (LSS)
      1. Detect nurses' location change
   3. Wireless Phone System (WPSS)
      1. Rings primary nurse wireless phone upon receiving ALERT from NCSS
      2. Establish audio path with patient and nurse
      3. VoIP
         1. Easily scalable
         2. Reduced cost from phone calls
6. Evaluation
   1. No delay time in deciding secondary nurse
   2. Successfully detects nurse location and availability
   3. VoIP delays in milliseconds
   4. Call latency
      1. Sum of a sequence of delays
   5. Patient receive response time at most 13s worst case from nurse
7. Limitations
   1. Conforming to XML messages between all systems