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Changed Downlink TBF Establishment.

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We don't use TBF establishment on CCCH and Immediate Assignment message any more, now we establish Downlink TBF during Uplink TBF and use Packet Downlink Assignment message.
Added function gprs_rlcmac_packet_downlink_assignment() and modified TBF management.
zecke/hacks/quick-exit
Ivan Kluchnikov 11 years ago
parent 0b450c19e7
commit 9c795abac8
3 changed files with 41 additions and 11 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 2
      gprs_bssgp_pcu.cpp
  2. 47
      gprs_rlcmac.cpp
  3. 3
      gprs_rlcmac.h

2
gprs_bssgp_pcu.cpp
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@ -65,7 +65,7 @@ int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg)
//DEBUGP(DBSSGP, "BSSGP Catch from SGSN=%u octets. Send it to OpenBTS.\n", data_index);
gsmtap_send_llc(tbf->rlc_data,data_index);
tbf->data_index = data_index;
gprs_rlcmac_downlink_assignment(tbf);
gprs_rlcmac_packet_downlink_assignment(tbf);
}
/* Receive a BSSGP PDU from a BSS on a PTP BVCI */

47
gprs_rlcmac.cpp
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@ -132,6 +132,7 @@ static void tbf_gsm_timer_cb(void *_tbf)
// This is timer for delay RLC/MAC data sending after Downlink Immediate Assignment on CCCH.
gprs_rlcmac_segment_llc_pdu(tbf);
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
tbf_free(tbf);
break;
default:
COUT("Timer expired in unknown mode" << tbf->fT);
@ -467,6 +468,7 @@ int gprs_rlcmac_rcv_data_block(bitvec *rlc_block)
if (!tbf) {
return 0;
}
tbf->tlli = ul_data_block->TLLI;
switch (tbf->state) {
case GPRS_RLCMAC_WAIT_DATA_SEQ_START:
@ -474,8 +476,15 @@ int gprs_rlcmac_rcv_data_block(bitvec *rlc_block)
tbf->data_index = 0;
gprs_rlcmac_data_block_parse(tbf, ul_data_block);
gprs_rlcmac_tx_ul_ack(tbf->tfi, tbf->tlli, ul_data_block);
tbf->state = GPRS_RLCMAC_WAIT_NEXT_DATA_BLOCK;
tbf->bsn = ul_data_block->BSN;
if (ul_data_block->CV == 0) {
// Recieved last Data Block in this sequence.
gsmtap_send_llc(tbf->rlc_data, tbf->data_index);
tbf->state = GPRS_RLCMAC_WAIT_NEXT_DATA_SEQ;
gprs_rlcmac_tx_ul_ud(tbf);
} else {
tbf->bsn = ul_data_block->BSN;
tbf->state = GPRS_RLCMAC_WAIT_NEXT_DATA_BLOCK;
}
}
break;
case GPRS_RLCMAC_WAIT_NEXT_DATA_BLOCK:
@ -486,6 +495,7 @@ int gprs_rlcmac_rcv_data_block(bitvec *rlc_block)
// Recieved last Data Block in this sequence.
gsmtap_send_llc(tbf->rlc_data, tbf->data_index);
tbf->state = GPRS_RLCMAC_WAIT_NEXT_DATA_SEQ;
gprs_rlcmac_tx_ul_ud(tbf);
} else {
tbf->bsn = ul_data_block->BSN;
tbf->state = GPRS_RLCMAC_WAIT_NEXT_DATA_BLOCK;
@ -508,10 +518,10 @@ int gprs_rlcmac_rcv_data_block(bitvec *rlc_block)
/* Received Uplink RLC control block. */
int gprs_rlcmac_rcv_control_block(bitvec *rlc_block)
{
//static unsigned shutUp = 0;
uint8_t tfi = 0;
uint32_t tlli = 0;
struct gprs_rlcmac_tbf *tbf;
struct gprs_rlcmac_tbf *ul_tbf;
RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t));
LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
@ -525,7 +535,8 @@ int gprs_rlcmac_rcv_control_block(bitvec *rlc_block)
if (!tbf) {
return 0;
}
gprs_rlcmac_tx_ul_ud(tbf);
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli);
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
tbf_free(tbf);
break;
case MT_PACKET_DOWNLINK_ACK_NACK:
@ -534,12 +545,10 @@ int gprs_rlcmac_rcv_control_block(bitvec *rlc_block)
if (!tbf) {
return 0;
}
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Packet Uplink Assignment\n", tbf->tfi, tbf->tlli);
bitvec *packet_uplink_assignment = bitvec_alloc(23);
bitvec_unhex(packet_uplink_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
write_packet_uplink_assignment(packet_uplink_assignment, tbf->tfi, tbf->tlli);
pcu_l1if_tx(packet_uplink_assignment, GsmL1_Sapi_Pacch);
bitvec_free(packet_uplink_assignment);
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli);
tlli = tbf->tlli;
LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
tbf_free(tbf);
break;
}
free(ul_control_block);
@ -702,3 +711,21 @@ void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf)
bitvec_free(immediate_assignment);
tbf_gsm_timer_start(tbf, 0, 120);
}
void gprs_rlcmac_packet_downlink_assignment(gprs_rlcmac_tbf *tbf)
{
LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Packet DL Assignment\n", tbf->tfi, tbf->tlli);
bitvec *packet_downlink_assignment_vec = bitvec_alloc(23);
bitvec_unhex(packet_downlink_assignment_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
write_packet_downlink_assignment(packet_downlink_assignment_vec, tbf->tfi, tbf->tlli, (l1fh->fl1h)->channel_info.tn,
(l1fh->fl1h)->channel_info.ta, (l1fh->fl1h)->channel_info.tsc);
RlcMacDownlink_t * packet_downlink_assignment = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t));
LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n");
decode_gsm_rlcmac_downlink(packet_downlink_assignment_vec, packet_downlink_assignment);
LOGPC(DRLCMAC, LOGL_NOTICE, "\n");
LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Downlink Assignment -------------------------\n");
free(packet_downlink_assignment);
pcu_l1if_tx(packet_downlink_assignment_vec, GsmL1_Sapi_Pacch);
bitvec_free(packet_downlink_assignment_vec);
tbf_gsm_timer_start(tbf, 0, 120);
}

3
gprs_rlcmac.h
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@ -99,4 +99,7 @@ void gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf);
void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf);
void gprs_rlcmac_packet_downlink_assignment(gprs_rlcmac_tbf *tbf);
#endif // GPRS_RLCMAC_H

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