Added packet uplink and downlink assignment, packet uplink ack, RLC/MAC Data and Control blocks dispatchers, gsmtap support for LLC PDUs.
This commit is contained in:
parent
8aa4c52d2e
commit
3450640624
327
GPRSSocket.cpp
327
GPRSSocket.cpp
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@ -20,8 +20,8 @@
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#include <Sockets.h>
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#include <Sockets.h>
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#include <Threads.h>
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#include <Threads.h>
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#include <BitVector.h>
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#include <BitVector.h>
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#include <gsmtap.h>
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#include "GPRSSocket.h"
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#include "GPRSSocket.h"
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#include "gsm_rlcmac.h"
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#include "bssgp.h"
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#include "bssgp.h"
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#define MAX_UDP_LENGTH 1500
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#define MAX_UDP_LENGTH 1500
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@ -31,6 +31,42 @@
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// TODO: We should take ports and IP from config.
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// TODO: We should take ports and IP from config.
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UDPSocket GPRSRLCMACSocket(5070, "127.0.0.1", 5934);
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UDPSocket GPRSRLCMACSocket(5070, "127.0.0.1", 5934);
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UDPSocket GSMTAPSocket(5077, "127.0.0.1", 4729);
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void sendToGSMTAP(uint8_t * data, unsigned len)
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{
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char buffer[MAX_UDP_LENGTH];
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int ofs = 0;
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// Build header
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struct gsmtap_hdr *header = (struct gsmtap_hdr *)buffer;
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header->version = 2;
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header->hdr_len = sizeof(struct gsmtap_hdr) >> 2;
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header->type = 0x08;
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header->timeslot = 5;
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header->arfcn = 0;
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header->signal_dbm = 0;
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header->snr_db = 0;
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header->frame_number = 0;
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header->sub_type = 0;
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header->antenna_nr = 0;
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header->sub_slot = 0;
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header->res = 0;
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ofs += sizeof(*header);
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// Add frame data
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unsigned j = 0;
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for (unsigned i = ofs; i < len+ofs; i++)
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{
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buffer[i] = (char)data[j];
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j++;
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}
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ofs += len;
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// Write the GSMTAP packet
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GSMTAPSocket.write(buffer, ofs);
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}
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void sendToOpenBTS(BitVector * vector)
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void sendToOpenBTS(BitVector * vector)
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{
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{
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@ -98,6 +134,76 @@ void writePDassignment(BitVector * dest, uint8_t TFI, uint32_t TLLI)
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dest->writeField(wp,0x0,1); // Measurement Mapping struct not present
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dest->writeField(wp,0x0,1); // Measurement Mapping struct not present
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}
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}
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void writePUassignment(BitVector * dest, uint8_t TFI, uint32_t TLLI)
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{
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// TODO We should use our implementation of encode RLC/MAC Control messages.
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unsigned wp = 0;
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dest->writeField(wp,0x1,2); // Payload Type
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dest->writeField(wp,0x0,2); // Uplink block with TDMA framenumber
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dest->writeField(wp,0x1,1); // Suppl/Polling Bit
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dest->writeField(wp,0x1,3); // Uplink state flag
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dest->writeField(wp,0xa,6); // MESSAGE TYPE
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dest->writeField(wp,0x0,2); // Page Mode
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dest->writeField(wp,0x0,1); // switch PERSIST_LEVEL: off
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dest->writeField(wp,0x2,2); // switch TLLI : on
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dest->writeField(wp,TLLI,32); // TLLI
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dest->writeField(wp,0x0,1); // Message escape
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dest->writeField(wp,0x0,2); // CHANNEL_CODING_COMMAND
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dest->writeField(wp,0x0,1); // TLLI_BLOCK_CHANNEL_CODING
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dest->writeField(wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on
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dest->writeField(wp,0x0,6); // TIMING_ADVANCE_VALUE
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dest->writeField(wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off
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dest->writeField(wp,0x0,1); // Frequency Parameters = off
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dest->writeField(wp,0x1,2); // Dynamic Allocation = off
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dest->writeField(wp,0x0,1); // Dynamic Allocation
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dest->writeField(wp,0x0,1); // P0 = off
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dest->writeField(wp,0x1,1); // USF_GRANULARITY
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dest->writeField(wp,0x1,1); // switch TFI : on
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dest->writeField(wp,TFI,5);// TFI
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dest->writeField(wp,0x0,1); //
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dest->writeField(wp,0x0,1); // TBF Starting Time = off
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dest->writeField(wp,0x0,1); // Timeslot Allocation
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dest->writeField(wp,0x0,5); // USF_TN 0 - 4
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dest->writeField(wp,0x1,1); // USF_TN 5
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dest->writeField(wp,0x1,3); // USF_TN 5
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dest->writeField(wp,0x0,2); // USF_TN 6 - 7
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// dest->writeField(wp,0x0,1); // Measurement Mapping struct not present
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}
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void writeIARestOctetsDownlinkAssignment(BitVector * dest, uint8_t TFI, uint32_t TLLI)
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{
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// GMS 04.08 10.5.2.37b 10.5.2.16
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unsigned wp = 0;
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dest->writeField(wp, 3, 2); // "HH"
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dest->writeField(wp, 1, 2); // "01" Packet Downlink Assignment
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dest->writeField(wp,TLLI,32); // TLLI
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dest->writeField(wp,0x1,1); // switch TFI : on
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dest->writeField(wp,TFI,5); // TFI
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dest->writeField(wp,0x0,1); // RLC acknowledged mode
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dest->writeField(wp,0x0,1); // ALPHA = present
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//dest->writeField(wp,0x0,4); // ALPHA power control parameter
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dest->writeField(wp,0x0,5); // GAMMA power control parameter
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dest->writeField(wp,0x1,1); // Polling Bit
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dest->writeField(wp,0x1,1); // TA_VALID ???
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dest->writeField(wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on
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dest->writeField(wp,0xC,4); // TIMING_ADVANCE_INDEX
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dest->writeField(wp,0x1,1); // TBF Starting TIME present
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dest->writeField(wp,0xffff,16); // TBF Starting TIME (we should set it in OpenBTS)
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dest->writeField(wp,0x0,1); // P0 not present
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}
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void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN)
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void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN)
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{
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{
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// TODO We should use our implementation of encode RLC/MAC Control messages.
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// TODO We should use our implementation of encode RLC/MAC Control messages.
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@ -137,83 +243,162 @@ void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsig
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dest->writeField(wp,0x00,4); //spare
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dest->writeField(wp,0x00,4); //spare
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}
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}
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void RLCMACDispatchMessage(BitVector *vector)
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void RLCMACExtractData(uint8_t* tfi, uint32_t* tlli, RlcMacUplinkDataBlock_t * dataBlock, uint8_t* rlc_data, unsigned* dataIndex)
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{
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unsigned blockDataLen = 0;
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unsigned dataOctetNum = 0;
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*tfi = dataBlock->TFI;
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if (dataBlock->E_1 == 0) // Extension octet follows immediately
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{
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// TODO We should implement case with several LLC PDU in one data block.
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blockDataLen = dataBlock->LENGTH_INDICATOR[0];
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}
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else
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{
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blockDataLen = 20; // RLC data length without 3 header octets.
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if(dataBlock->TI == 1) // TLLI field is present
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{
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*tlli = dataBlock->TLLI;
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blockDataLen -= 4; // TLLI length
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if (dataBlock->PI == 1) // PFI is present if TI field indicates presence of TLLI
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{
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blockDataLen -= 1; // PFI length
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}
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}
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}
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for (unsigned i = *dataIndex; i < *dataIndex + blockDataLen; i++)
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{
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rlc_data[i] = dataBlock->RLC_DATA[dataOctetNum];
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dataOctetNum++;
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}
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*dataIndex += blockDataLen;
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}
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void sendUplinkAck(uint8_t tfi, uint32_t tlli, RlcMacUplinkDataBlock_t * dataBlock)
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{
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BitVector packetUplinkAck(23*8);
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packetUplinkAck.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
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writePUack(&packetUplinkAck, tfi, tlli, dataBlock->CV, dataBlock->BSN);
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COUT("RLCMAC_CONTROL_BLOCK>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
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RlcMacDownlink_t * pUA = (RlcMacDownlink_t *)malloc(sizeof(RlcMacUplink_t));
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decode_gsm_rlcmac_downlink(&packetUplinkAck, pUA);
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free(pUA);
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COUT("RLCMAC_CONTROL_BLOCK_END------------------------------");
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sendToOpenBTS(&packetUplinkAck);
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}
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void RLCMACDispatchDataBlock(unsigned* waitData, BitVector *vector, uint8_t* tfi, uint32_t* tlli, uint8_t* rlc_data, unsigned* dataIndex)
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{
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static DataBlockDispatcherState state = WaitSequenceStart;
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static unsigned prevBSN = -1;
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if ((*waitData == 1)&&(state == WaitNextSequence))
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{
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state = WaitSequenceStart;
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}
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COUT("RLCMAC_DATA_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<");
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RlcMacUplinkDataBlock_t * dataBlock = (RlcMacUplinkDataBlock_t *)malloc(sizeof(RlcMacUplinkDataBlock_t));
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decode_gsm_rlcmac_uplink_data(vector, dataBlock);
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COUT("RLCMAC_DATA_BLOCK_END------------------------------");
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switch (state) {
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case WaitSequenceStart:
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if (dataBlock->BSN == 0)
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{
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*dataIndex = 0;
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RLCMACExtractData(tfi, tlli, dataBlock, rlc_data, dataIndex);
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sendUplinkAck(*tfi, *tlli, dataBlock);
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state = WaitNextBlock;
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prevBSN = 0;
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}
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break;
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case WaitNextBlock:
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if (prevBSN == (dataBlock->BSN - 1))
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{
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RLCMACExtractData(tfi, tlli, dataBlock, rlc_data, dataIndex);
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sendUplinkAck(*tfi, *tlli, dataBlock);
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if (dataBlock->CV == 0)
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{
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// Recieved last Data Block in this sequence.
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sendToGSMTAP(rlc_data, *dataIndex);
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state = WaitNextSequence;
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prevBSN = -1;
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*waitData = 0;
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}
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else
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{
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prevBSN = dataBlock->BSN;
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state = WaitNextBlock;
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}
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}
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else
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{
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// Recieved Data Block with unexpected BSN.
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// We should try to find nesessary Data Block.
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state = WaitNextBlock;
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}
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break;
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case WaitNextSequence:
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// Now we just ignore all Data Blocks and wait next Uplink TBF
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break;
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}
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free(dataBlock);
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}
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void RLCMACDispatchControlBlock(unsigned* waitData, BitVector *vector, uint8_t* tfi, uint32_t* tlli, uint8_t* rlc_data, unsigned* dataIndex)
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{
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static unsigned shutUp = 0;
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COUT("RLCMAC_CONTROL_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<");
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RlcMacUplink_t * controlBlock = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t));
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decode_gsm_rlcmac_uplink(vector, controlBlock);
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COUT("RLCMAC_CONTROL_BLOCK_END------------------------------");
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switch (controlBlock->u.MESSAGE_TYPE) {
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case MT_PACKET_CONTROL_ACK:
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if (shutUp == 0)
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{
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COUT("SEND IA Rest Octets Downlink Assignment>>>>>>>>>>>>>>>>>>");
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BitVector IARestOctetsDownlinkAssignment(23*8);
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IARestOctetsDownlinkAssignment.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
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writeIARestOctetsDownlinkAssignment(&IARestOctetsDownlinkAssignment, 20, *tlli);
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sendToOpenBTS(&IARestOctetsDownlinkAssignment);
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usleep(500000);
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sendToSGSN(*tfi, *tlli, rlc_data, *dataIndex);
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//sendToGSMTAP(rlc_data, *dataIndex);
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shutUp = 1;
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}
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break;
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case MT_PACKET_DOWNLINK_ACK_NACK:
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COUT("SEND PacketUplinkAssignment>>>>>>>>>>>>>>>>>>");
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BitVector PacketUplinkAssignment(23*8);
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PacketUplinkAssignment.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
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writePUassignment(&PacketUplinkAssignment, 21, *tlli);
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sendToOpenBTS(&PacketUplinkAssignment);
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*waitData = 1;
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break;
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}
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free(controlBlock);
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}
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void RLCMACDispatchBlock(BitVector *vector)
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{
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{
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static uint8_t rlc_data[60];
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static uint8_t rlc_data[60];
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static uint8_t tfi = 0;
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static uint8_t *tfi = (uint8_t *)malloc(sizeof(uint8_t));
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static uint32_t tlli = 0;
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static uint32_t *tlli = (uint32_t *)malloc(sizeof(uint32_t));
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static unsigned dataIndex = 0;
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static unsigned *dataIndex = (unsigned *)malloc(sizeof(unsigned));
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static unsigned startDispatch = 0;
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static unsigned waitData = 1;
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unsigned blockDataLen = 0;
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unsigned readIndex = 0;
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unsigned readIndex = 0;
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unsigned payload = vector->readField(readIndex, 2);
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unsigned payload = vector->readField(readIndex, 2);
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switch (payload) {
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switch (payload) {
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case RLCMAC_DATA_BLOCK:
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case RLCMAC_DATA_BLOCK:
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{
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RLCMACDispatchDataBlock(&waitData,vector, tfi, tlli, rlc_data, dataIndex);
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COUT("RLCMAC_DATA_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<");
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RlcMacUplinkDataBlock_t * dataBlock = (RlcMacUplinkDataBlock_t *)malloc(sizeof(RlcMacUplinkDataBlock_t));
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decode_gsm_rlcmac_uplink_data(vector, dataBlock);
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COUT("RLCMAC_DATA_BLOCK_END------------------------------");
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//TODO Implement other cases.
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if (dataBlock->BSN == 0)
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{
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startDispatch = 1;
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}
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if (startDispatch)
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{
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tfi = dataBlock->TFI;
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if (dataBlock->E_1 == 0) // Extension octet follows immediately
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{
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blockDataLen = dataBlock->LENGTH_INDICATOR[0];
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}
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else
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{
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blockDataLen = 20;
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if(dataBlock->TI == 1) // TLLI field is present
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{
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tlli = dataBlock->TLLI;
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blockDataLen -= 4;
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if (dataBlock->PI == 1) // PFI is present if TI field indicates presence of TLLI
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{
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blockDataLen -= 1;
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}
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}
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}
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unsigned dataOctetNum = 0;
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for (unsigned i = dataIndex; i < dataIndex + blockDataLen; i++)
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{
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rlc_data[i] = dataBlock->RLC_DATA[dataOctetNum];
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dataOctetNum++;
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}
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dataIndex += blockDataLen;
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BitVector packetUplinkAck(23*8);
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|
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packetUplinkAck.unhex("2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
||||||
writePUack(&packetUplinkAck, tfi, tlli, dataBlock->CV, dataBlock->BSN);
|
|
||||||
COUT("RLCMAC_CONTROL_BLOCK>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
|
|
||||||
RlcMacDownlink_t * pUA = (RlcMacDownlink_t *)malloc(sizeof(RlcMacUplink_t));
|
|
||||||
decode_gsm_rlcmac_downlink(&packetUplinkAck, pUA);
|
|
||||||
free(pUA);
|
|
||||||
COUT("RLCMAC_CONTROL_BLOCK_END------------------------------");
|
|
||||||
sendToOpenBTS(&packetUplinkAck);
|
|
||||||
}
|
|
||||||
if (dataBlock->CV == 0)
|
|
||||||
{
|
|
||||||
sendToSGSN(tfi, tlli, rlc_data, dataIndex);
|
|
||||||
dataIndex = 0;
|
|
||||||
startDispatch = 0;
|
|
||||||
}
|
|
||||||
free(dataBlock);
|
|
||||||
}
|
|
||||||
break;
|
break;
|
||||||
case RLCMAC_CONTROL_BLOCK:
|
case RLCMAC_CONTROL_BLOCK:
|
||||||
{
|
RLCMACDispatchControlBlock(&waitData, vector, tfi, tlli, rlc_data, dataIndex);
|
||||||
COUT("RLCMAC_CONTROL_BLOCK<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<");
|
|
||||||
RlcMacUplink_t * controlBlock = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t));
|
|
||||||
decode_gsm_rlcmac_uplink(vector, controlBlock);
|
|
||||||
free(controlBlock);
|
|
||||||
COUT("RLCMAC_CONTROL_BLOCK_END------------------------------");
|
|
||||||
}
|
|
||||||
break;
|
break;
|
||||||
default:
|
default:
|
||||||
COUT("Unknown RLCMAC block payload\n");
|
COUT("Unknown RLCMAC block payload\n");
|
||||||
|
@ -230,7 +415,7 @@ void *RLCMACSocket(void *)
|
||||||
if (count>0) {
|
if (count>0) {
|
||||||
vector->unpack((const unsigned char*)buf);
|
vector->unpack((const unsigned char*)buf);
|
||||||
COUT("Recieve from OpenBTS (MS): " << *vector);
|
COUT("Recieve from OpenBTS (MS): " << *vector);
|
||||||
RLCMACDispatchMessage(vector);
|
RLCMACDispatchBlock(vector);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
18
GPRSSocket.h
18
GPRSSocket.h
|
@ -21,12 +21,28 @@
|
||||||
#define GPRSSOCKET_H
|
#define GPRSSOCKET_H
|
||||||
|
|
||||||
#include <BitVector.h>
|
#include <BitVector.h>
|
||||||
|
#include "gsm_rlcmac.h"
|
||||||
|
|
||||||
|
|
||||||
|
enum DataBlockDispatcherState {
|
||||||
|
WaitSequenceStart,
|
||||||
|
WaitNextBlock,
|
||||||
|
WaitNextSequence
|
||||||
|
};
|
||||||
|
|
||||||
|
void sendToGSMTAP(uint8_t * data, unsigned len);
|
||||||
|
|
||||||
void sendToOpenBTS(BitVector * vector);
|
void sendToOpenBTS(BitVector * vector);
|
||||||
|
|
||||||
void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN);
|
void writePUack(BitVector * dest, uint8_t TFI, uint32_t TLLI, unsigned CV, unsigned BSN);
|
||||||
|
|
||||||
void RLCMACDispatchMessage(BitVector *vector);
|
void RLCMACExtractData(uint8_t* tfi, uint32_t* tlli, RlcMacUplinkDataBlock_t * dataBlock, uint8_t* rlc_data, unsigned* dataIndex);
|
||||||
|
|
||||||
|
void sendUplinkAck(uint8_t tfi, uint32_t tlli, RlcMacUplinkDataBlock_t * dataBlock);
|
||||||
|
|
||||||
|
void RLCMACDispatchDataBlock(BitVector *vector, uint8_t* tfi, uint32_t* tlli, uint8_t* rlc_data, unsigned* dataIndex);
|
||||||
|
|
||||||
|
void RLCMACDispatchBlock(BitVector *vector);
|
||||||
|
|
||||||
void *RLCMACSocket(void *);
|
void *RLCMACSocket(void *);
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue