diff options
Diffstat (limited to 'src/tbf.cpp')
| -rw-r--r-- | src/tbf.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/tbf.cpp b/src/tbf.cpp index f8e1dcb4..5bef5149 100644 --- a/src/tbf.cpp +++ b/src/tbf.cpp @@ -22,6 +22,7 @@ #include <bts.h> #include <tbf.h> #include <rlc.h> +#include <encoding.h> #include <gprs_rlcmac.h> #include <gprs_debug.h> @@ -33,6 +34,9 @@ extern "C" { #include <errno.h> #include <string.h> +/* If acknowledgement to downlink assignment should be polled */ +#define POLLING_ASSIGNMENT_DL 1 + extern "C" { int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, uint8_t num_frames, uint32_t num_octets); @@ -879,6 +883,96 @@ int gprs_rlcmac_tbf::assemble_forward_llc(uint8_t *data, uint8_t len) return 0; } +struct msgb *gprs_rlcmac_tbf::create_dl_ass(uint32_t fn) +{ + struct msgb *msg; + struct gprs_rlcmac_tbf *new_tbf; + int poll_ass_dl = POLLING_ASSIGNMENT_DL; + + if (poll_ass_dl && direction == GPRS_RLCMAC_DL_TBF + && control_ts != first_common_ts) { + LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " + "assigment, because MS cannot reply. (control TS=%d, " + "first common TS=%d)\n", control_ts, + first_common_ts); + poll_ass_dl = 0; + } + if (poll_ass_dl) { + if (poll_state != GPRS_RLCMAC_POLL_NONE) { + LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " + "for TBF=%d, so we must wait for downlink " + "assignment...\n", tfi); + return NULL; + } + if (bts->sba()->find(trx_no, control_ts, (fn + 13) % 2715648)) { + LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " + "scheduled for single block allocation...\n"); + return NULL; + } + } + + /* on uplink TBF we get the downlink TBF to be assigned. */ + if (direction == GPRS_RLCMAC_UL_TBF) { + /* be sure to check first, if contention resolution is done, + * otherwise we cannot send the assignment yet */ + if (!dir.ul.contention_resolution_done) { + LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " + "because contention resolution is not " + "finished.\n"); + return NULL; + } + #warning "THIS should probably go over the IMSI too" + new_tbf = bts->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); + } else + new_tbf = this; + if (!new_tbf) { + LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " + "assignment at uplink TBF=%d, but there is no downlink " + "TBF\n", tfi); + dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; + return NULL; + } + + msg = msgb_alloc(23, "rlcmac_dl_ass"); + if (!msg) + return NULL; + bitvec *ass_vec = bitvec_alloc(23); + if (!ass_vec) { + msgb_free(msg); + return NULL; + } + bitvec_unhex(ass_vec, + "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); + LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Downlink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli); + RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); + Encoding::write_packet_downlink_assignment(mac_control_block, tfi, + (direction == GPRS_RLCMAC_DL_TBF), new_tbf, + poll_ass_dl, bts_data()->alpha, bts_data()->gamma, -1, 0); + LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); + encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); + LOGPC(DCSN1, LOGL_NOTICE, "\n"); + LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); + bitvec_pack(ass_vec, msgb_put(msg, 23)); + bitvec_free(ass_vec); + talloc_free(mac_control_block); + + if (poll_ass_dl) { + poll_state = GPRS_RLCMAC_POLL_SCHED; + poll_fn = (fn + 13) % 2715648; + dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; + } else { + dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; + tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); + tbf_assign_control_ts(new_tbf); + /* stop pending assignment timer */ + new_tbf->stop_timer(); + + } + debug_diagram(bts, diag, "send DL-ASS"); + + return msg; +} + void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx) { for (uint8_t tfi = 0; tfi < 32; tfi++) { |