diff options
Diffstat (limited to 'src/bts.cpp')
| -rw-r--r-- | src/bts.cpp | 254 |
1 files changed, 253 insertions, 1 deletions
diff --git a/src/bts.cpp b/src/bts.cpp index 95672143..3c7ce407 100644 --- a/src/bts.cpp +++ b/src/bts.cpp @@ -571,6 +571,258 @@ int gprs_rlcmac_pdch::rcv_data_block_acknowledged(struct gprs_rlcmac_bts *bts, return 0; } +/* Received Uplink RLC control block. */ +int gprs_rlcmac_pdch::rcv_control_block(struct gprs_rlcmac_bts *bts, + bitvec *rlc_block, uint8_t trx, uint8_t ts, + uint32_t fn) +{ + int8_t tfi = 0; /* must be signed */ + uint32_t tlli = 0; + struct gprs_rlcmac_tbf *tbf; + struct gprs_rlcmac_sba *sba; + int rc; + + RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t); + LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); + decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); + LOGPC(DCSN1, LOGL_NOTICE, "\n"); + LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); + switch (ul_control_block->u.MESSAGE_TYPE) { + case MT_PACKET_CONTROL_ACK: + tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; + tbf = bts->bts->tbf_by_poll_fn(fn, trx, ts); + if (!tbf) { + LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " + "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", + fn, tlli, trx, ts); + break; + } + tfi = tbf->tfi; + if (tlli != tbf->tlli) { + LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to " + "0x%08x\n", tlli); + tbf->tlli = tlli; + } + LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli); + tbf->poll_state = GPRS_RLCMAC_POLL_NONE; + + /* check if this control ack belongs to packet uplink ack */ + if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { + LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); + tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; + debug_diagram(bts->bts, tbf->diag, "got CTL-ACK (fin)"); + if ((tbf->state_flags & + (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { + tbf->state_flags &= + ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " + "ack for UL TBF=%d\n", tbf->tfi); + } + tbf_free(tbf); + break; + } + if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { + LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); + /* reset N3105 */ + tbf->n3105 = 0; + tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; + debug_diagram(bts->bts, tbf->diag, "got CTL-ACK DL-ASS"); + if (tbf->direction == GPRS_RLCMAC_UL_TBF) + tbf = bts->bts->tbf_by_tlli(tbf->tlli, + GPRS_RLCMAC_DL_TBF); + if (!tbf) { + LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " + "TBF is gone\n"); + break; + } + tbf_new_state(tbf, GPRS_RLCMAC_FLOW); + /* stop pending assignment timer */ + tbf_timer_stop(tbf); + if ((tbf->state_flags & + (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { + tbf->state_flags &= + ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink " + "assignment for DL TBF=%d\n", tbf->tfi); + } + tbf_assign_control_ts(tbf); + break; + } + if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { + LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); + /* reset N3105 */ + tbf->n3105 = 0; + tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; + debug_diagram(bts->bts, tbf->diag, "got CTL-AC UL-ASS"); + if (tbf->direction == GPRS_RLCMAC_DL_TBF) + tbf = bts->bts->tbf_by_tlli(tbf->tlli, + GPRS_RLCMAC_UL_TBF); + if (!tbf) { + LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " + "TBF is gone\n"); + break; + } + tbf_new_state(tbf, GPRS_RLCMAC_FLOW); + if ((tbf->state_flags & + (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { + tbf->state_flags &= + ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " + "assignment for UL TBF=%d\n", tbf->tfi); + } + tbf_assign_control_ts(tbf); + break; + } + LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " + "at no request\n"); + break; + case MT_PACKET_DOWNLINK_ACK_NACK: + tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; + tbf = bts->bts->tbf_by_poll_fn(fn, trx, ts); + if (!tbf) { + LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " + "unknown FN=%u TFI=%d (TRX %d TS %d)\n", + fn, tfi, trx, ts); + break; + } + if (tbf->tfi != tfi) { + LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " + "wrong TFI=%d, ignoring!\n", tfi); + break; + } + tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); + if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { + tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); + LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack " + "for DL TBF=%d\n", tbf->tfi); + } + /* reset N3105 */ + tbf->n3105 = 0; + /* stop timer T3191 */ + tbf_timer_stop(tbf); + tlli = tbf->tlli; + LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli); + tbf->poll_state = GPRS_RLCMAC_POLL_NONE; + debug_diagram(bts->bts, tbf->diag, "got DL-ACK"); + + rc = gprs_rlcmac_downlink_ack(tbf, + ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, + ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, + ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP); + if (rc == 1) { + tbf_free(tbf); + break; + } + /* check for channel request */ + if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) { + LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " + "message, so we provide one:\n"); + tbf_alloc_ul(bts, tbf->trx_no, tbf->ms_class, tbf->tlli, tbf->ta, tbf); + /* schedule uplink assignment */ + tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; + } + break; + case MT_PACKET_RESOURCE_REQUEST: + if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { + tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; + tbf = bts->bts->tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); + if (tbf) { + LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " + "TLLI=0x%08x while UL TBF=%d still " + "exists. Killing pending DL TBF\n", + tlli, tbf->tfi); + tbf_free(tbf); + tbf = NULL; + } + if (!tbf) { + uint8_t ms_class = 0; + struct gprs_rlcmac_tbf *dl_tbf; + uint8_t ta; + + if ((dl_tbf = bts->bts->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) { + LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " + "TLLI=0x%08x while DL TBF=%d still exists. " + "Killing pending DL TBF\n", tlli, + dl_tbf->tfi); + tbf_free(dl_tbf); + } + LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " + "in packet ressource request of single " + "block, so we provide one:\n"); + sba = bts->bts->sba()->find(trx, ts, fn); + if (!sba) { + LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF " + "in packet ressource request of single " + "block, but there is no resource request " + "scheduled!\n"); + rc = bts->bts->timing_advance()->recall(tlli); + if (rc >= 0) + ta = rc; + else + ta = 0; + } else { + ta = sba->ta; + bts->bts->timing_advance()->remember(tlli, ta); + llist_del(&sba->list); + talloc_free(sba); + } + if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability) + ms_class = Decoding::get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability); + if (!ms_class) + LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n"); + tbf = tbf_alloc_ul(bts, trx, ms_class, tlli, ta, NULL); + if (!tbf) + break; + /* set control ts to current MS's TS, until assignment complete */ + LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts); + tbf->control_ts = ts; + /* schedule uplink assignment */ + tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; + debug_diagram(bts->bts, tbf->diag, "Res. REQ"); + break; + } + tfi = tbf->tfi; + } else { + if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { + tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI; + tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_DL_TBF); + if (!tbf) { + LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TBF=%d\n", tlli); + break; + } + } else { + tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI; + tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_UL_TBF); + if (!tbf) { + LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli); + break; + } + } + tlli = tbf->tlli; + } + LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] %s TFI: %u TLLI: 0x%08x FIXME: Packet ressource request\n", (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, tbf->tlli); + break; + case MT_PACKET_MEASUREMENT_REPORT: + sba = bts->bts->sba()->find(trx, ts, fn); + if (!sba) { + LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " + "in packet ressource request of single " + "block, but there is no resource request " + "scheduled!\n"); + } else { + bts->bts->timing_advance()->remember(ul_control_block->u.Packet_Measurement_Report.TLLI, sba->ta); + llist_del(&sba->list); + talloc_free(sba); + } + gprs_rlcmac_meas_rep(&ul_control_block->u.Packet_Measurement_Report); + break; + default: + LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n"); + } + talloc_free(ul_control_block); + return 1; +} + /* received RLC/MAC block from L1 */ int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn, int8_t rssi) @@ -590,7 +842,7 @@ int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn, int8_t if (!block) return -ENOMEM; bitvec_unpack(block, data); - rc = gprs_rlcmac_rcv_control_block(bts, block, trx_no, ts_no, fn); + rc = rcv_control_block(bts, block, trx_no, ts_no, fn); bitvec_free(block); break; case GPRS_RLCMAC_CONTROL_BLOCK_OPT: |