“…In HRT based systems, if packets arrive after the predefined delay deadline, then this is considered as a system failure [15,16]. But due to lossy links and error-prone medium, it is almost SRT SAR [21], EAQOS [23], RAP [25], SPEED [28], RPAR [29], OEDSR [34], SDRCS [37], AGEM [38], EQSR [39] FRT [16] Multiconstrained MMSPEED [31], DARA [41], RLTD [42], LRGR [46], QMOR [44], MCRA [48] SI based AntNet [14], ASAR [53], ACOLBR [54], M-IAR [51], ACOWHSN [56], AntSensNet [57], HLEAR [60], AntHQNet [61], QoSPSO [63], ICACR [64], FROMS [65], SPEA [66], BeeSensor [69], Bee-Sensor-C [72], EQR-RL [74], FTIEE [77] Based on network structure Flat REAR [82], LEAR [83] Hierarchical PEMuR [85], EEQAR [88] Location based TPGF [59], GEAMS [94], GPSR [27], DGR [93], EA-TPGF [95], PWDGR [96] impossible to guarantee HRT in WMSNs. In SRT based systems, some packet missing the delay deadli...…”