DSFrame.c

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#include "main.h"
#include "802_22.h"
/** The DS-MAP message defines the access to the downstream information. 
The length of the DS-MAP shall be an integer number of bytes. This function is used to
generate the FCH frame,DS-MAP packet,US-MAP packet,DCD,UCD etc.*/
int fn_NetSim_CR_FormDSFrame(NETSIM_ID nDeviceId, NETSIM_ID nInterfaceId,double dTime)
{
    NetSim_PACKET* pstruPacket;
    unsigned int nSize;
    BS_PHY* pstruBSPhy;
    BS_MAC* pstruBSMAC;
    int nBurstId;
    int flag;
    unsigned int nSlotRequire;
    SYMBOL_PARAMETER* pstruSymbol;
    pstruBSPhy = DEVICE_PHYVAR(nDeviceId,nInterfaceId);
    pstruBSMAC = DEVICE_MACVAR(nDeviceId,nInterfaceId);
    pstruSymbol = pstruBSPhy->pstruSymbolParameter;
    
    flag =1;
    if(pstruBSPhy->nFrameNumber==0)
        flag=3;
 
    //Fill the first symbol by FCH frame
    //Generate the FCH frame
    pstruPacket = fn_NetSim_CR_GenerateBroadcastCtrlPacket(nDeviceId,nInterfaceId,MMM_FCH);
    pstruPacket->dEventTime = dTime;
    pstruPacket->pstruMacData->dArrivalTime = dTime;
    //Add FCH to BS MAC
    nBurstId = fn_NetSim_CR_FillDSFrame(FCH_SIZE,pstruBSMAC->pstruDSBurst,pstruSymbol,flag,&nSlotRequire);
    fn_NetSim_CR_AddPacketToDSBurst(pstruBSMAC->pstruDSBurst[nBurstId],pstruPacket);
    //Generate DS-MAP packet
    pstruPacket = fn_NetSim_CR_FormDSMAP(nDeviceId,nInterfaceId);
    pstruPacket->dEventTime = dTime;
    pstruPacket->pstruMacData->dArrivalTime = dTime;
    nSize = (unsigned int)fnGetPacketSize(pstruPacket);
    nBurstId = fn_NetSim_CR_FillDSFrame(nSize,pstruBSMAC->pstruDSBurst,pstruSymbol,flag,&nSlotRequire);
    fn_NetSim_CR_AddPacketToDSBurst(pstruBSMAC->pstruDSBurst[nBurstId],pstruPacket);
    //Generate US-MAP packet
    pstruPacket = fn_NetSim_CR_FormUSMAP(nDeviceId,nInterfaceId);
    pstruPacket->dEventTime = dTime;
    pstruPacket->pstruMacData->dArrivalTime = dTime;
    nSize = (unsigned int)fnGetPacketSize(pstruPacket);
    nBurstId = fn_NetSim_CR_FillDSFrame(nSize,pstruBSMAC->pstruDSBurst,pstruSymbol,flag,&nSlotRequire);
    fn_NetSim_CR_AddPacketToDSBurst(pstruBSMAC->pstruDSBurst[nBurstId],pstruPacket);
    //Generate UCD packet
    pstruPacket = fn_NetSim_CR_FormUCD(nDeviceId,nInterfaceId);
    pstruPacket->dEventTime = dTime;
    pstruPacket->pstruMacData->dArrivalTime = dTime;
    nSize = (unsigned int)fnGetPacketSize(pstruPacket);
    nBurstId = fn_NetSim_CR_FillDSFrame(nSize,pstruBSMAC->pstruDSBurst,pstruSymbol,flag,&nSlotRequire);
    fn_NetSim_CR_AddPacketToDSBurst(pstruBSMAC->pstruDSBurst[nBurstId],pstruPacket);
    //Generate DCD Packet
    pstruPacket = fn_NetSim_CR_FormDCD(nDeviceId,nInterfaceId);
    pstruPacket->dEventTime = dTime;
    pstruPacket->pstruMacData->dArrivalTime = dTime;
    nSize = (unsigned int)fnGetPacketSize(pstruPacket);
    nBurstId = fn_NetSim_CR_FillDSFrame(nSize,pstruBSMAC->pstruDSBurst,pstruSymbol,flag,&nSlotRequire);
    fn_NetSim_CR_AddPacketToDSBurst(pstruBSMAC->pstruDSBurst[nBurstId],pstruPacket);
    //Add other broadcast mac pdu
    pstruBSMAC->chsFrameCount--;
    if(pstruBSMAC->chsFrameCount <=0)
    {
        pstruBSMAC->nCHSREQFlag = ZERO;
        pstruBSMAC->chsFrameCount = 0;
    }
    while(pstruBSMAC->pstruBroadcastPDU)
    {
        pstruPacket = pstruBSMAC->pstruBroadcastPDU;
        pstruBSMAC->pstruBroadcastPDU = pstruBSMAC->pstruBroadcastPDU->pstruNextPacket;
        pstruPacket->pstruNextPacket = NULL;
        nSize = (unsigned int)fnGetPacketSize(pstruPacket);
        nBurstId = fn_NetSim_CR_FillDSFrame(nSize,pstruBSMAC->pstruDSBurst,pstruSymbol,flag,&nSlotRequire);
        if(nBurstId)
            fn_NetSim_CR_AddPacketToDSBurst(pstruBSMAC->pstruDSBurst[nBurstId],pstruPacket);
        else
            printf("No slot");
    }
    return 1;
}
/** This function is used to  transmit the appropriate DSBurst. */
int fn_NetSim_CR_TransmitDSBurst()
{
    BS_MAC* pstruBSMac = DEVICE_MACVAR(pstruEventDetails->nDeviceId,pstruEventDetails->nInterfaceId);
    BS_PHY* pstruBSPhy = DEVICE_PHYVAR(pstruEventDetails->nDeviceId,pstruEventDetails->nInterfaceId);
    unsigned int nBurstId = pstruBSMac->nDSBurst;
    NetSim_PACKET* pstruMACPdu;
    SYMBOL_PARAMETER* pstruSymbol = pstruBSPhy->pstruSymbolParameter;
    if(pstruBSPhy->pstruOpratingChannel == NULL || pstruBSMac->dDSFrameTime <= pstruEventDetails->dEventTime)
    {
        return -1; //UCS notification or DSFrame over
    }
    //check for a packet
    if(nBurstId <pstruSymbol->nDownLinkSymbol && pstruBSMac->pstruDSBurst[nBurstId]->pstruMACPDU)
    {
TRANSMITDSBURST:
        pstruMACPdu = fn_NetSim_CR_UNFillSlot(pstruEventDetails->nDeviceId,pstruEventDetails->nInterfaceId,nBurstId);
        if(pstruMACPdu->nControlDataType/100 == MAC_PROTOCOL_IEEE802_22)
        {
            switch(pstruMACPdu->nControlDataType%100)
            {
            case MMM_DS_MAP:
                pstruBSMac->pstruDSMAP = NULL;
                break;
            case MMM_US_MAP:
                pstruBSMac->pstruUSMAP = NULL;
                break;
            case MMM_UCD:
                pstruBSMac->pstruUCD = NULL;
                break;
            case MMM_DCD:
                pstruBSMac->pstruDCD = NULL;
                break;
            }
        }
        
        //Prepare physical out event
        pstruEventDetails->dPacketSize =  fnGetPacketSize(pstruMACPdu);
        if(pstruMACPdu->pstruAppData)
            pstruEventDetails->nApplicationId = pstruMACPdu->pstruAppData->nApplicationId;
        else
            pstruEventDetails->nApplicationId = 0;
        pstruEventDetails->nEventType = PHYSICAL_OUT_EVENT;
        pstruEventDetails->nPacketId = pstruMACPdu->nPacketId;
        pstruEventDetails->nProtocolId = MAC_PROTOCOL_IEEE802_22;
        pstruEventDetails->nSubEventType = 0;
        pstruEventDetails->pPacket = pstruMACPdu;
        fnpAddEvent(pstruEventDetails);
    }
    else
    {
        pstruBSMac->nDSBurst++;
        nBurstId++;
        if(nBurstId <pstruSymbol->nDownLinkSymbol && pstruBSMac->pstruDSBurst[nBurstId]->pstruMACPDU)
            goto TRANSMITDSBURST;
    }
    return 1;
}