Table 5 Data types used in the model of HSM

N1

Integer type, for the N_ID of the CI.

M _SIZE

Float type, for the size of a message.

M _D

Integer type, for the N_ID of the D of a message.

M _ID

Integer type, for the M_ID of a message.

M _{TTL_F}

Boolean type TTL flag that is TRUE throughout the life-time of a message, is FALSE on life-time expiry.

M _{ACK_F}

Boolean type ACK flag that sets to TRUE on the successful ACK of a message, is FALSE otherwise.

Node_L

Integer array type, for the N_IDs of the CNs.

Avlbl_B

Float type, for available space, in a node’s message buffer.

M _{ID_D}

Integer array type, for the M_IDs, in a node’s RL.

M _{ID_A}

Integer array type, for the M_IDs, in a node’s AL.

M _{ID_R}

Integer array type, for M_IDs of messages, in a node’s ML.

N2

Integer type, for the N_ID of the CN.

U _{CD_N1_D}

Float type, for CD-based utility of CI w.r.t a message’s D.

U _{CD_N2_D}

Float type, for CD-based utility of CN w.r.t a message’s D.

U _{ICT_N1_D}

Float type, for ICT-based utility of CI w.r.t a message’s D.

U _{ICT_N2_D}

Float type, for ICT-based utility of CN w.r.t a message’s D.