Adding multislot allocation algorithm
This commit is contained in:
Andreas Eversberg
parent
6664a90365
commit
53f4725d10
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@ -22,6 +22,55 @@
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#include <pcu_l1_if.h>
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#include <gprs_rlcmac.h>
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/* 3GPP TS 05.02 Annex B.1 */
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#define MS_NA 255 /* N/A */
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#define MS_A 254 /* 1 with hopping, 0 without */
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#define MS_B 253 /* 1 with hopping, 0 without (change Rx to Tx)*/
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#define MS_C 252 /* 1 with hopping, 0 without (change Tx to Rx)*/
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struct gprs_ms_multislot_class {
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uint8_t rx, tx, sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */
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uint8_t ta, tb, ra, rb; /* Minimum Number of Slots */
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uint8_t type; /* Type of Mobile */
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};
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struct gprs_ms_multislot_class gprs_ms_multislot_class[32] = {
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/* M-S Class Rx Tx Sum Tta Ttb Tra Trb Type */
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/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA },
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/* 1 */ { 1, 1, 2, 3, 2, 4, 2, 1 },
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/* 2 */ { 2, 1, 3, 3, 2, 3, 1, 1 },
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/* 3 */ { 2, 2, 3, 3, 2, 3, 1, 1 },
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/* 4 */ { 3, 1, 4, 3, 1, 3, 1, 1 },
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/* 5 */ { 2, 2, 4, 3, 1, 3, 1, 1 },
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/* 6 */ { 3, 2, 4, 3, 1, 3, 1, 1 },
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/* 7 */ { 3, 3, 4, 3, 1, 3, 1, 1 },
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/* 8 */ { 4, 1, 5, 3, 1, 2, 1, 1 },
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/* 9 */ { 3, 2, 5, 3, 1, 2, 1, 1 },
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/* 10 */ { 4, 2, 5, 3, 1, 2, 1, 1 },
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/* 11 */ { 4, 3, 5, 3, 1, 2, 1, 1 },
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/* 12 */ { 4, 4, 5, 2, 1, 2, 1, 1 },
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/* 13 */ { 3, 3, MS_NA, MS_NA, MS_A, 3, MS_A, 2 },
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/* 14 */ { 4, 4, MS_NA, MS_NA, MS_A, 3, MS_A, 2 },
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/* 15 */ { 5, 5, MS_NA, MS_NA, MS_A, 3, MS_A, 2 },
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/* 16 */ { 6, 6, MS_NA, MS_NA, MS_A, 2, MS_A, 2 },
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/* 17 */ { 7, 7, MS_NA, MS_NA, MS_A, 1, 0, 2 },
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/* 18 */ { 8, 8, MS_NA, MS_NA, 0, 0, 0, 2 },
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/* 19 */ { 6, 2, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 20 */ { 6, 3, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 21 */ { 6, 4, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 22 */ { 6, 4, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 23 */ { 6, 6, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 24 */ { 8, 2, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 25 */ { 8, 3, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 26 */ { 8, 4, MS_NA, 3, MS_B, 2, MS_C, 1 },
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/* 27 */ { 8, 4, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 28 */ { 8, 6, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* 29 */ { 8, 8, MS_NA, 2, MS_B, 2, MS_C, 1 },
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/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA },
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/* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA },
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};
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LLIST_HEAD(gprs_rlcmac_ul_tbfs);
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LLIST_HEAD(gprs_rlcmac_dl_tbfs);
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void *rlcmac_tall_ctx;
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@ -294,6 +343,386 @@ int alloc_algorithm_a(struct gprs_rlcmac_tbf *old_tbf,
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return 0;
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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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* Assign one uplink slot. (With free USF)
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*
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*/
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int alloc_algorithm_b(struct gprs_rlcmac_tbf *old_tbf,
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struct gprs_rlcmac_tbf *tbf, uint32_t cust)
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{
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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struct gprs_rlcmac_pdch *pdch;
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struct gprs_ms_multislot_class *ms_class;
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uint8_t Rx, Tx, Sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */
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uint8_t Tta, Ttb, Tra, Trb, Tt, Tr; /* Minimum Number of Slots */
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uint8_t Type; /* Type of Mobile */
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uint8_t rx_win_min, rx_win_max;
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uint8_t tx_win_min, tx_win_max, tx_range;
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uint8_t rx_window = 0, tx_window = 0;
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const char *digit[10] = { "0","1","2","3","4","5","6","7","8","9" };
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uint8_t usf[8];
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int8_t tsc = -1; /* must be signed */
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uint8_t i, ts;
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LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm B) for class "
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"%d\n", tbf->ms_class);
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if (tbf->ms_class >= 32) {
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LOGP(DRLCMAC, LOGL_ERROR, "Multislot class %d out of range.\n",
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tbf->ms_class);
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return -EINVAL;
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}
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ms_class = &gprs_ms_multislot_class[tbf->ms_class];
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if (ms_class->tx == MS_NA) {
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LOGP(DRLCMAC, LOGL_NOTICE, "Multislot class %d not "
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"applicable.\n", tbf->ms_class);
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return -EINVAL;
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}
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Rx = ms_class->rx;
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Tx = ms_class->tx;
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Sum = ms_class->sum;
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Tta = ms_class->ta;
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Ttb = ms_class->tb;
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Tra = ms_class->ra;
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Trb = ms_class->rb;
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Type = ms_class->type;
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/* Tta and Ttb may depend on hopping or frequency change */
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if (Ttb == MS_A) {
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if (/* FIXME: hopping*/ 0)
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Ttb = 1;
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else
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Ttb = 0;
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}
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if (Trb == MS_A) {
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if (/* FIXME: hopping*/ 0)
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Ttb = 1;
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else
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Ttb = 0;
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}
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if (Ttb == MS_B) {
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/* FIXME: or frequency change */
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if (/* FIXME: hopping*/ 0)
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Ttb = 1;
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else
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Ttb = 0;
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}
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if (Trb == MS_C) {
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/* FIXME: or frequency change */
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if (/* FIXME: hopping*/ 0)
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Ttb = 1;
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else
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Ttb = 0;
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "- Rx=%d Tx=%d Sum Rx+Tx=%s Tta=%s Ttb=%d "
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" Tra=%d Trb=%d Type=%d\n", Rx, Tx,
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(Sum == MS_NA) ? "N/A" : digit[Sum],
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(Tta == MS_NA) ? "N/A" : digit[Tta], Ttb, Tra, Trb, Type);
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/* select the values for time contraints */
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if (/* FIXME: monitoring */0) {
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/* applicable to type 1 and type 2 */
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Tt = Ttb;
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Tr = Tra;
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} else {
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/* applicable to type 1 and type 2 */
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Tt = Ttb;
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Tr = Trb;
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}
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/* select a window of Rx slots if available
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* The maximum allowed slots depend on RX or the window of available
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* slots.
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* This must be done for uplink TBF also, because it is the basis
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* for calculating control slot and uplink slot(s). */
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rx_win_min = rx_win_max = tbf->first_ts;
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for (ts = tbf->first_ts, i = 0; ts < 8; ts++) {
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pdch = &bts->trx[tbf->trx].pdch[ts];
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/* check if enabled */
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if (!pdch->enable) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, because "
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"not enabled\n", ts);
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/* increase window for Type 1 */
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if (Type == 1)
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i++;
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continue;
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}
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/* check if TSC changes */
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if (tsc < 0)
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tbf->tsc = tsc = pdch->tsc;
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else if (tsc != pdch->tsc) {
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LOGP(DRLCMAC, LOGL_ERROR, "Skipping TS %d of TRX=%d, "
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"because it has different TSC than lower TS "
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"of TRX. In order to allow multislot, all "
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"slots must be configured with the same "
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"TSC!\n", ts, tbf->trx);
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/* increase window for Type 1 */
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if (Type == 1)
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i++;
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continue;
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}
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/* check if TFI for slot is available
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* This is only possible for downlink TFI. */
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if (tbf->direction == GPRS_RLCMAC_DL_TBF
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&& pdch->dl_tbf[tbf->tfi]) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, because "
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"already assigned to other DL TBF with "
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"TFI=%d\n", ts, tbf->tfi);
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/* increase window for Type 1 */
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if (Type == 1)
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i++;
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continue;
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}
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rx_window |= (1 << ts);
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LOGP(DRLCMAC, LOGL_DEBUG, "- Selected DL TS %d\n", ts);
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/* range of window (required for Type 1) */
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rx_win_max = ts;
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if (++i == Rx) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because slots / "
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"window reached maximum alowed Rx size\n");
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break;
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}
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "- Selected slots for RX: "
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"(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n",
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((rx_window & 0x01)) ? 'D' : '.',
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((rx_window & 0x02)) ? 'D' : '.',
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((rx_window & 0x04)) ? 'D' : '.',
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((rx_window & 0x08)) ? 'D' : '.',
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((rx_window & 0x10)) ? 'D' : '.',
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((rx_window & 0x20)) ? 'D' : '.',
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((rx_window & 0x40)) ? 'D' : '.',
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((rx_window & 0x80)) ? 'D' : '.');
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/* reduce window, if existing uplink slots collide RX window */
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if (Type == 1 && old_tbf && old_tbf->direction == GPRS_RLCMAC_UL_TBF) {
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uint8_t collide = 0, ul_usage = 0;
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int j;
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/* calculate mask of colliding slots */
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for (ts = old_tbf->first_ts; ts < 8; ts++) {
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if (old_tbf->pdch[ts]) {
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ul_usage |= (1 << ts);
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/* mark bits from TS-t .. TS+r */
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for (j = ts - Tt; j != ((ts + Tr + 1) & 7);
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j = (j + 1) & 7)
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collide |= (1 << j);
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}
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "- Not allowed slots due to existing "
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"UL allocation: (TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7) "
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" D=downlink x=not usable\n",
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((ul_usage & 0x01)) ? 'D' : ((collide & 0x01))?'x':'.',
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((ul_usage & 0x02)) ? 'D' : ((collide & 0x02))?'x':'.',
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((ul_usage & 0x04)) ? 'D' : ((collide & 0x04))?'x':'.',
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((ul_usage & 0x08)) ? 'D' : ((collide & 0x08))?'x':'.',
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((ul_usage & 0x10)) ? 'D' : ((collide & 0x10))?'x':'.',
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((ul_usage & 0x20)) ? 'D' : ((collide & 0x20))?'x':'.',
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((ul_usage & 0x40)) ? 'D' : ((collide & 0x40))?'x':'.',
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((ul_usage & 0x80)) ? 'D' : ((collide & 0x80))?'x':'.');
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/* apply massk to reduce tx_window (shifted by 3 slots) */
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rx_window &= ~(collide << 3);
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rx_window &= ~(collide >> 5);
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LOGP(DRLCMAC, LOGL_DEBUG, "- Remaining slots for RX: "
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"(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n",
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((rx_window & 0x01)) ? 'D' : '.',
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((rx_window & 0x02)) ? 'D' : '.',
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((rx_window & 0x04)) ? 'D' : '.',
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((rx_window & 0x08)) ? 'D' : '.',
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((rx_window & 0x10)) ? 'D' : '.',
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((rx_window & 0x20)) ? 'D' : '.',
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((rx_window & 0x40)) ? 'D' : '.',
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((rx_window & 0x80)) ? 'D' : '.');
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if (!rx_window) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No suitable downlink slots "
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"available with current uplink assignment\n");
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return -EBUSY;
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}
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/* calculate new min/max */
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for (ts = rx_win_min; ts <= rx_win_max; ts++) {
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if ((rx_window & (1 << ts)))
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break;
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rx_win_min = ts + 1;
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LOGP(DRLCMAC, LOGL_NOTICE, "- TS has been deleted, so "
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"raising start of DL window to %d\n",
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rx_win_min);
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}
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for (ts = rx_win_max; ts >= rx_win_min; ts--) {
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if ((rx_window & (1 << ts)))
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break;
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rx_win_max = ts - 1;
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LOGP(DRLCMAC, LOGL_NOTICE, "- TS has been deleted, so "
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"lowering end of DL window to %d\n",
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rx_win_max);
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}
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}
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/* reduce window, to allow at least one uplink TX slot
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* this is only required for Type 1 */
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if (Type == 1 && rx_win_max - rx_win_min + 1 + Tt + 1 + Tr > 8) {
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rx_win_max = rx_win_min + 7 - Tr - 1 - Tr;
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LOGP(DRLCMAC, LOGL_DEBUG, "- Reduce RX window due to time "
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"contraints to %d slots\n",
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rx_win_max - rx_win_min + 1);
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "- RX-Window is: %d..%d\n", rx_win_min,
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rx_win_max);
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/* calculate TX window */
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if (Type == 1) {
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/* calculate TX window (shifted by 3 timeslots)
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* it uses the space between tx_win_max and tx_win_min */
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tx_win_min = (rx_win_max - 2 + Tt) & 7;
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tx_win_max = (rx_win_min + 4 - Tr) & 7;
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/* calculate the TX window size (might be larger than Tx) */
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tx_range = (tx_win_max - tx_win_min + 1) & 7;
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} else {
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/* TX and RX simultaniously */
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tx_win_min = rx_win_min;
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tx_win_max = 7;
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/* TX window size (might be larger than Tx) */
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tx_range = tx_win_max - tx_win_min + 1;
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "- TX-Window is: %d..%d\n", tx_win_min,
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tx_win_max);
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/* select a window of Tx slots if available
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* The maximum allowed slots depend on TX or the window of available
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* slots. */
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if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
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for (ts = tx_win_min, i = 0; i < tx_range; ts = (ts + 1) & 7) {
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pdch = &bts->trx[tbf->trx].pdch[ts];
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/* check if enabled */
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if (!pdch->enable) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, "
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"because not enabled\n", ts);
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continue;
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}
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/* check if TSC changes */
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if (tsc < 0)
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tbf->tsc = tsc = pdch->tsc;
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else if (tsc != pdch->tsc) {
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LOGP(DRLCMAC, LOGL_ERROR, "Skipping TS %d of "
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"TRX=%d, because it has different TSC "
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"than lower TS of TRX. In order to "
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"allow multislot, all slots must be "
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"configured with the same TSC!\n",
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ts, tbf->trx);
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/* increase window for Type 1 */
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if (Type == 1)
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i++;
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continue;
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}
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/* check if TFI for slot is available */
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if (pdch->ul_tbf[tbf->tfi]) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, "
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"because already assigned to other "
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"UL TBF with TFI=%d\n", ts, tbf->tfi);
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/* increase window for Type 1 */
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if (Type == 1)
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i++;
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continue;
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}
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/* check for free usf */
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usf[ts] = find_free_usf(pdch, ts);
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if (usf[ts] < 0) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, "
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"because no USF available\n", ts);
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/* increase window for Type 1 */
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if (Type == 1)
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i++;
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continue;
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}
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tx_window |= (1 << ts);
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LOGP(DRLCMAC, LOGL_DEBUG, "- Selected UL TS %d\n", ts);
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if (!(cust & 1)) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because "
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"1 slot assigned\n");
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break;
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}
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if (++i == Tx) {
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LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because "
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"slots / window reached maximum alowed "
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"Tx size\n");
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break;
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}
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "- Selected TX window: "
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"(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n",
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((tx_window & 0x01)) ? 'U' : '.',
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((tx_window & 0x02)) ? 'U' : '.',
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((tx_window & 0x04)) ? 'U' : '.',
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((tx_window & 0x08)) ? 'U' : '.',
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((tx_window & 0x10)) ? 'U' : '.',
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((tx_window & 0x20)) ? 'U' : '.',
|
||||
((tx_window & 0x40)) ? 'U' : '.',
|
||||
((tx_window & 0x80)) ? 'U' : '.');
|
||||
|
||||
if (!tx_window) {
|
||||
LOGP(DRLCMAC, LOGL_NOTICE, "No suitable uplink slots "
|
||||
"available\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
}
|
||||
|
||||
if (tbf->direction == GPRS_RLCMAC_DL_TBF) {
|
||||
/* assign downlink */
|
||||
if (rx_window == 0) {
|
||||
LOGP(DRLCMAC, LOGL_NOTICE, "No downlink slots "
|
||||
"available\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
for (ts = 0; ts < 8; ts++) {
|
||||
if ((rx_window & (1 << ts))) {
|
||||
LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning DL TS "
|
||||
"%d\n", ts);
|
||||
pdch = &bts->trx[tbf->trx].pdch[ts];
|
||||
pdch->dl_tbf[tbf->tfi] = tbf;
|
||||
tbf->pdch[ts] = pdch;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
/* assign uplink */
|
||||
if (tx_window == 0) {
|
||||
LOGP(DRLCMAC, LOGL_NOTICE, "No uplink slots "
|
||||
"available\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
for (ts = 0; ts < 8; ts++) {
|
||||
if ((tx_window & (1 << ts))) {
|
||||
LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning UL TS "
|
||||
"%d\n", ts);
|
||||
pdch = &bts->trx[tbf->trx].pdch[ts];
|
||||
pdch->ul_tbf[tbf->tfi] = tbf;
|
||||
tbf->pdch[ts] = pdch;
|
||||
tbf->dir.ul.usf[ts] = usf[ts];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* the timeslot of the TX window start is always
|
||||
* available in RX window */
|
||||
tbf->first_common_ts = tx_win_min;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf)
|
||||
{
|
||||
struct gprs_rlcmac_pdch *pdch;
|
||||
|
|
|
|||
|
|
@ -184,7 +184,7 @@ int main(int argc, char *argv[])
|
|||
}
|
||||
|
||||
if (!bts->alloc_algorithm)
|
||||
bts->alloc_algorithm = alloc_algorithm_a;
|
||||
bts->alloc_algorithm = alloc_algorithm_b;
|
||||
|
||||
rc = pcu_l1if_open();
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue