An Adaptive Framework for Real-Time ECG Transmission in Mobile Environments

Algorithm 1

Layer-based EDF scheduling algorithm.

(1) 𝑑_𝑝: deadline of packet 𝑝

(2) 𝑂_𝑝: timeout value of packet 𝑝

(3) 𝑡_𝑐: current time

(4) 𝐵: set of packets in the transmission buffers of the sensor

(5) for every 𝜑 time-slots do

(6)  for   ∀𝑝∈𝐵   do

(7)   if   𝑡_𝑐>𝑑_𝑝   then

(8)    Remove the packet from the transmission buffer

(9)   end if

(10) end for

(11) Select packet 𝑝^′∈𝐵 with the lowest layer and the earliest deadline

(12) Send 𝑝^′ to the BS

(13) 𝑂_𝑝′←(𝑡_𝑐+𝛿+RTT).

(14) if the sensor gets an ACK of 𝑝^′ from the BS within 𝑂_𝑝′   then

(15)   Remove 𝑝^′

(16) else

(17)   Move 𝑝^′ into retransmission buffer

(18) end if

(19) end for