Multiconstraint-Aware Routing Mechanism for Wireless Body Sensor Networks

Algorithm 1

QoS-conscious next-hop selector algorithm.

	Inputs: RT and DP
(1)	START
(2)	for DP received at QoS-CNHS do
(3)	for each NN ε RT do
(4)	if WLQi,j ≥ WLQthre then
(5)	List NN into NHNWLQ
(6)	end if
(7)	end for
(8)	if NHNWLQ = NULL then
(9)	drop DP
(10)	else if DP ε CD !! DC ε DCD then
(11)	call delay-conscious procedure with inputs DP and NHNWLQ
(12)	else if DP ε RCD then
(13)	call reliability-conscious procedure with inputs DP and NHNWLQ
(14)	else
(15)	SNH ε NHNWLQ with minimum PTi,j,LC
(16)	forward DP towards NCQ
(17)	end if
(18)	end for
	Delay-Conscious Procedure
Inputs: NHNWLQ and DP
(19)	for each NN ε NHNWLQ do
(20)	if PDi,j, LC ≤ PDthre then
(21)	List NN into NHNPD
(22)	end if
(23)	if NHNPD = NULL then
(24)	drop DP
(25)	else if NHNPD = 1 then
(26)	SNH ε NHNPD
(27)	if CP ε DCD then
(28)	forward DP towards DCQ
(29)	else
(30)	forward DP towards CDQ
(31)	end if
(32)	else if DP ε DCD hen
(33)	SNH ε NHNPD with minimum PTi,j,LC
(34)	forward DP toward DCQ
(35)	else
(36)	call reliability-conscious procedure with inputs DP and
(37)	end if
(38)	end for
Reliability-Conscious Procedure
Inputs: NHNWLQ or NHNPD or and DP
(39)	for each NN ε NHNWLQ !! NN ε NHNPD do
(40)	if PRi,j, LC ≥ PRthre then
(41)	List NN into NHNPR
(42)	end if
(43)	if NHNPR = NULL then
(44)	SNH ε NHNWLQ !! SNH ε NHNPD with maximum PRi,j,LC
(45)	if DP ε RCD then
(46)	forward DP towards RCQ
(47)	else
(48)	forward DP towards CDQ
(49)	end if
(50)	else if NHNPR = 1 then
(51)	SNH ε NHNPR
(52)	if DP ε RCD then
(53)	forward DP towards RCQ
(54)	else
(55)	forward DP towards CDQ
(56)	end if
(57)	else
(58)	SNH ε NHNPR with minimum PTi,j,LC
(59)	if DP ε RCD then
(60)	forward DP towards RCQ
(61)	else
(62)	forward DP towards CDQ
(63)	end if
(64)	end if
(65)	end for
(66)	END