Efficient MAC Protocol for Hybrid Wireless Network with Heterogeneous Sensor Nodes

Algorithm 3

Packet reception algorithm.

(1) Procedure Pkt_Rx

(2)      if (packet recvd AND pkt.dest_add = self_add)

(3)         if (node = omni)

(4)              if (packet = RTS)

(5)                 CTS.sector = 0

(6)                 send CTS to antenna controller

(7)             else if (packet = CTS)

(8)                 wait for DATA

(9)             else if (packet = DATA)

(10)                 ACK.sector = 0

(11)                 send ACK to antenna controller

(12)            else

(13)                 transmission complete

(14)                 go to End

(15)         else

(16)             if (packet = RTS)

(17)                 CTS.sector = RTS.sector

(18)                 send CTS to antenna controller

(19)                 wait for SIFS time

(20)                 CTS.sector = 0

(21)                 send CTS to antenna controller

(22)             else if (packet = CTS)

(23)                 RTS.sector = 0

(24)                 send RTS to antenna controller

(25)                 wait for SIFS

(26)                 DATA.sector = CTS.sector

(27)                 send DATA to antenna controller

(28)             else if (packet = DATA)

(29)                 ACK.sector = DATA.sector

(30)                 send ACK to antenna controller

(31)             else

(32)                 transmission complete

(33)                 go to End

(34)      else if (packet recvd AND pkt.dest_add NOT self_add)

(35)         if (node = omni)

(36)             if (packet = RTSN/CTSN)

(37)                 set NAV2

(38)             else

(39)                 set NAV1

(40)         else

(41)             set DNAV for the beam

(42)             nit.beam_status = BLOCKED

(43)      else

(44)         sense the channel through its all beams

(45) End