backoff enter execs

opnet无线网络编程

/** Processing Random Backoff								**/
/** In this state following intrpts can occur: 				**/
/** 1. Data arrival from application layer   				**/
/** 2. Frame (DATA,ACK,RTS,CTS) rcvd from PHY layer			**/
/** 3. Busy intrpt stating that frame is being rcvd			**/
/** 4. Coll intrpt stating that more than one frame is rcvd	**/  
/** Queue the packet for Data Arrival from application 		**/
/** layer and do not change the state.						**/ 
/** If the frame is destined for this station then prepare  **/
/** appropriate frame to respond and set deference to SIFS	**/
/** Update NAV value (if needed) and reschedule deference	**/
/** Change state to "DEFER"									**/
/** If it's a broadcast frame then check whether NAV needs 	**/
/** to be updated. Schedule self interrupt and change		**/
/** state to Deference										**/
/** If rcvr start receiving frame (busy stat intrpt) then 	**/
/** set a flag indicating rcvr is busy. 					**/ 
/** if rcvr start receiving more than one frame then flag 	**/ 
/** the rcvd frame as invalid and set deference				**/
/** timer to EIFS   										**/ 
/* Change State to DEFER									**/

//WSN
// assigns the unique state number and writes the sleep staus to the sleep statistic handeler for graphing purposes
state = WSN_BACKOFF;

#ifndef OPD_NO_DEBUG
if ((op_sim_time() > wsn_test_time) && (my_address == wsn_test_address || my_address == wsn_test_address_2) )
	printf("Node <%d> in Backoff at time %e \n", my_address, op_sim_time());
#endif

if (wlan_trace_active)
	{
	/* Determine the current state name.					*/
	strcpy (current_state_name, "backoff");
	}

/* Unlock the mutex that serializes accessing the roaming	*/
/* related information of this MAC. 						*/
op_prg_mt_mutex_unlock (roam_state_ptr->roam_info_mutex);