lbt

[If N=0]

[If no more Tx is needed]

Sense_eCCA_Slot_State

Idle State

[If Channel has been idle for the initial CCA period]

Tx_State

[If N!=0]

Init_eCCA_State

Firest_CCA_State

[If channel has been idle for the for the eCCA slot duration]/N-=1

[If Tx is needed]

[If channel has not been idle for the for the initial CCA period]