wlan_rxgroup.ps.c

Ad hoc网络AODV路由协议源代码

/* wlan_rxgroup.ps.c */                                                       
/* Modified receiver group model for IEEE802.11 			*/
/* This routine is part of radio link Transceiver Pipeline 	*/


/****************************************/
/*		  Copyright (c) 1993			*/
/*			by MIL 3, Inc.				*/
/*		(A Delaware Corporation)		*/
/*	3400 International Drive,  N.W.		*/
/*		Washington, D.C., U.S.A.		*/
/*			All Rights Reserved.		*/
/****************************************/

#include <opnet.h>

#if defined (__cplusplus)
extern "C"
#endif
int
wlan_rxgroup (tx_obid, rx_obid)	
	Objid		tx_obid, rx_obid;
	{
	Objid       txnode_obid, rxnode_obid;
	/** Determine the potential for communication between	**/
	/** given transmitter and receiver channel objects.		**/
	FIN (wlan_rxgroup (tx_obid, rx_obid));

    txnode_obid =  op_topo_parent (op_topo_parent (op_topo_parent (tx_obid))); 
	rxnode_obid =  op_topo_parent (op_topo_parent (op_topo_parent (rx_obid)));

    /* Station should not hear its own transmission.	*/
	if (txnode_obid == rxnode_obid)
		{
		FRET (OPC_FALSE);
    	}
 
   /* Only stations in the same subnet will receive the packet.	*/ 
   if (op_topo_parent (txnode_obid) != op_topo_parent (rxnode_obid))
		{
		FRET (OPC_FALSE);
		}

	/* In IEEE802.11 model only receivers in the same subnet are considered */
	/* as potential destinations.											*/
	FRET (OPC_TRUE);
	}