Simplify TS alloc: move slot assignment
Move into separate functions: * move timeslot reservation * move UL timeslot assignment * move DL timeslot assignment Change-Id: I64cf78c5cfc78664766f9769dd5cde632dab92b0 Related: OS#2282
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@ -812,6 +812,75 @@ static int allocate_usf(const gprs_rlcmac_trx *trx, int8_t first_common_ts, uint
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return ul_slots;
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}
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/*! Update MS' reserved timeslots
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*
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* \param[in,out] trx Pointer to TRX struct
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* \param[in,out] ms_ Pointer to MS object
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* \param[in] tbf_ Pointer to TBF struct
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* \param[in] res_ul_slots Newly reserved UL slots
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* \param[in] res_dl_slots Newly reserved DL slots
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* \param[in] ul_slots available UL slots (for logging only)
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* \param[in] dl_slots available DL slots (for logging only)
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*/
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static void update_ms_reserved_slots(gprs_rlcmac_trx *trx, GprsMs *ms, uint8_t res_ul_slots, uint8_t res_dl_slots,
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uint8_t ul_slots, uint8_t dl_slots)
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{
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char slot_info[9] = { 0 };
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if (res_ul_slots == ms->reserved_ul_slots() && res_dl_slots == ms->reserved_dl_slots())
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return;
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/* The reserved slots have changed, update the MS */
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ms->set_reserved_slots(trx, res_ul_slots, res_dl_slots);
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ts_format(slot_info, dl_slots, ul_slots);
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LOGP(DRLCMAC, LOGL_DEBUG, "- Reserved DL/UL slots: (TS=0)\"%s\"(TS=7)\n", slot_info);
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}
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/*! Assign given UL timeslots to UL TBF
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*
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* \param[in,out] ul_tbf Pointer to UL TBF struct
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* \param[in,out] trx Pointer to TRX object
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* \param[in] ul_slots Set of slots to be assigned
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* \param[in] tfi selected TFI
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* \param[in] usf selected USF
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*/
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static void assign_ul_tbf_slots(struct gprs_rlcmac_ul_tbf *ul_tbf, gprs_rlcmac_trx *trx, uint8_t ul_slots, int tfi,
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int *usf)
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{
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uint8_t ts;
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for (ts = 0; ts < 8; ts++) {
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if (!(ul_slots & (1 << ts)))
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continue;
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OSMO_ASSERT(usf[ts] >= 0);
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LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning UL TS %u\n", ts);
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assign_uplink_tbf_usf(&trx->pdch[ts], ul_tbf, tfi, usf[ts]);
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}
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}
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/*! Assign given DL timeslots to DL TBF
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*
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* \param[in,out] dl_tbf Pointer to DL TBF struct
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* \param[in,out] trx Pointer to TRX object
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* \param[in] ul_slots Set of slots to be assigned
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* \param[in] tfi selected TFI
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*/
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static void assign_dl_tbf_slots(struct gprs_rlcmac_dl_tbf *dl_tbf, gprs_rlcmac_trx *trx, uint8_t dl_slots, int tfi)
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{
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uint8_t ts;
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for (ts = 0; ts < 8; ts++) {
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if (!(dl_slots & (1 << ts)))
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continue;
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LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning DL TS %u\n", ts);
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assign_dlink_tbf(&trx->pdch[ts], dl_tbf, tfi);
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}
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}
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/*! Slot Allocation: Algorithm B
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*
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* Assign as many downlink slots as possible.
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@ -834,8 +903,6 @@ int alloc_algorithm_b(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcm
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int8_t first_common_ts;
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uint8_t slotcount = 0;
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uint8_t avail_count = 0, trx_no;
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char slot_info[9] = {0};
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int ts;
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int first_ts = -1;
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int usf[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
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int rc;
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@ -927,50 +994,16 @@ int alloc_algorithm_b(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcm
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/* Step 4: Update MS and TBF and really allocate the resources */
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/* The reserved slots have changed, update the MS */
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if (reserved_ul_slots != ms->reserved_ul_slots() ||
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reserved_dl_slots != ms->reserved_dl_slots())
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{
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ms_->set_reserved_slots(trx,
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reserved_ul_slots, reserved_dl_slots);
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LOGP(DRLCMAC, LOGL_DEBUG,
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"- Reserved DL/UL slots: (TS=0)\"%s\"(TS=7)\n",
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set_flag_chars(set_flag_chars(set_flag_chars(slot_info,
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dl_slots, 'D', '.'),
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ul_slots, 'U'),
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ul_slots & dl_slots, 'C'));
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}
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update_ms_reserved_slots(trx, ms_, reserved_ul_slots, reserved_dl_slots, ul_slots, dl_slots);
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tbf_->trx = trx;
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tbf_->first_common_ts = first_common_ts;
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tbf_->first_ts = first_ts;
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if (tbf->direction == GPRS_RLCMAC_DL_TBF) {
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struct gprs_rlcmac_dl_tbf *dl_tbf = as_dl_tbf(tbf_);
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for (ts = 0; ts < 8; ts++) {
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if (!(dl_slots & (1 << ts)))
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continue;
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LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning DL TS "
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"%d\n", ts);
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assign_dlink_tbf(&trx->pdch[ts], dl_tbf, tfi);
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}
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} else {
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struct gprs_rlcmac_ul_tbf *ul_tbf = as_ul_tbf(tbf_);
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for (ts = 0; ts < 8; ts++) {
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if (!(ul_slots & (1 << ts)))
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continue;
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OSMO_ASSERT(usf[ts] >= 0);
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LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning UL TS "
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"%d\n", ts);
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assign_uplink_tbf_usf(&trx->pdch[ts], ul_tbf,
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tfi, usf[ts]);
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}
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}
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if (tbf->direction == GPRS_RLCMAC_DL_TBF)
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assign_dl_tbf_slots(as_dl_tbf(tbf_), trx, dl_slots, tfi);
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else
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assign_ul_tbf_slots(as_ul_tbf(tbf_), trx, ul_slots, tfi, usf);
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bts->bts->tbf_alloc_algo_b();
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@ -23,6 +23,7 @@
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#include <mslot_class.h>
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#include <gprs_debug.h>
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#include <osmocom/core/bits.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/logging.h>
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@ -252,3 +253,10 @@ void masked_override_with(char *buf, uint8_t mask, char set_char)
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if (mask & 1)
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buf[i] = set_char;
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}
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void ts_format(char *buf, uint8_t dl_mask, uint8_t ul_mask)
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{
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snprintf(buf, 9, OSMO_BIT_SPEC, OSMO_BIT_PRINT_EX(dl_mask, 'D'));
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masked_override_with(buf, ul_mask, 'U');
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masked_override_with(buf, ul_mask & dl_mask, 'C');
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}
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@ -56,3 +56,4 @@ void mslot_fill_rx_mask(uint8_t mslot_class, uint8_t num_tx, uint8_t *rx_mask);
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int8_t find_free_usf(uint8_t usf_map);
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int8_t find_free_tfi(uint32_t tfi_map);
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void masked_override_with(char *buf, uint8_t mask, char set_char);
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void ts_format(char *buf, uint8_t dl_mask, uint8_t ul_mask);
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@ -5921,7 +5921,7 @@ Slot Allocation (Algorithm B) for class 11
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Rx=4 Tx=3 Sum Rx+Tx=5, Tta=3 Ttb=1, Tra=2 Trb=1, Type=1
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- Selected DL slots: (TS=0)"..ddDd.."(TS=7), single
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Using single slot at TS 4 for DL
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- Reserved DL/UL slots: (TS=0)"....C..."(TS=7)
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- Reserved DL/UL slots: (TS=0)"...DC..."(TS=7)
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- Assigning DL TS 4
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PDCH(TS 4, TRX 0): Attaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS), 1 TBFs, USFs = 00, TFIs = 00000001.
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TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS) Setting Control TS 4
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