“…The device uses a photoplethysmograph(PPG) to obtain heart and respiratory rates from patients. A method has been pro- [11], [12], [17] [7], [20], [33] [21], [22], [26] Delay and Reliability [7] Emergency data Modified MAC protocol with only Delay support [8] Emergency and Normal data Propagation delay and Available bandwidth-based next hop selection [10] Emergency and Normal data Modified MAC protocol for emergency data transmission with only delay support [9] Emergency and Normal data Delay and reliability consideration for the Emergency data, Energy and congestion consideration for the normal data [12] Emergency and Normal data Node energy, link efficiency and hop count [14] No data priority Link reliability, link delay, and temperature of the node [15] Emergency, Reliable, Delay and Normal data types Queuing, transmission, propagation, and processing delay of the next-hop [16] Delay sensitive and Normal data types Cluster-based transmission for normal data and direct transmission for emergency data [33] Emergency and normal data Increased transmission power and random back-off time modification for emergency data transmission [17] Emergency and Normal data MAC frame structure is modified to support delay and reliability for the Emergency data [18] Emergency, Delay, and Normal Delay and Reliability support [20] Critical, Delay, reliable and Normal data End-to-End delay, Duplicate paths, and node energy parameter-based path support for the delay, reliable and normal packet transmission rep. [21] Delay, reliable and Normal Multi-sink single path for reliability, Packet velocity for delay-sensitive and node energy for the normal packet [22] Emergency, Reliable, Delay and Normal data types Based on packet types MAC frame structure and Back-off values modified [24] Emergency, Reliable, Delay and Normal data types Emergency data is transmitted using energy-efficient shortest path along with bandwidth support [26] Emergency and Normal data…”