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osmo-pcu
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Packet Downlink Assigment now uses ARFCN/TN of current BTS layout 

Now the MS receives dowlink LLC frames.
This commit is contained in:
Andreas Eversberg 2012-06-25 09:26:15 +02:00
parent 055340801b
commit 7d7cf54f39
3 changed files with 19 additions and 14 deletions
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9
src/gprs_bssgp_pcu.cpp
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@ -30,6 +30,7 @@ int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
struct bssgp_ud_hdr *budh;
int tfi;
int i = 0;
uint8_t trx, ts;
budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
struct gprs_rlcmac_tbf *tbf;
@ -38,8 +39,14 @@ int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
if (tfi < 0) {
return tfi;
}
/* FIXME: select right TRX/TS */
tbf = tbf_alloc(tfi, 0, 0);
if (select_pdch(&trx, &ts)) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
/* FIXME: send reject */
return -EBUSY;
}
tbf = tbf_alloc(tfi, trx, ts);
tbf->direction = GPRS_RLCMAC_DL_TBF;
tbf->state = GPRS_RLCMAC_WAIT_DATA_SEQ_START;
tbf->tlli = ntohl(budh->tlli);

22
src/gprs_rlcmac.cpp
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@ -166,10 +166,11 @@ static void gprs_rlcmac_enqueue_block(bitvec *block, int len)
msgb_enqueue(&block_queue, msg);
}
void write_packet_downlink_assignment(bitvec * dest, uint8_t tfi, uint32_t tlli, uint8_t tn, uint8_t ta, uint8_t tsc)
void write_packet_downlink_assignment(bitvec * dest, uint8_t tfi, uint32_t tlli, uint16_t arfcn, uint8_t tn, uint8_t ta, uint8_t tsc)
{
// TODO We should use our implementation of encode RLC/MAC Control messages.
unsigned wp = 0;
int i;
bitvec_write_field(dest, wp,0x1,2); // Payload Type
bitvec_write_field(dest, wp,0x0,2); // Uplink block with TDMA framenumber
bitvec_write_field(dest, wp,0x1,1); // Suppl/Polling Bit
@ -187,7 +188,7 @@ void write_packet_downlink_assignment(bitvec * dest, uint8_t tfi, uint32_t tlli
bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode
bitvec_write_field(dest, wp,0x0,1); // the network establishes no new downlink TBF for the mobile station
bitvec_write_field(dest, wp,0x1,8); // timeslot 7
bitvec_write_field(dest, wp,0x80 >> tn,8); // timeslot(s)
bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on
bitvec_write_field(dest, wp,ta,6); // TIMING_ADVANCE_VALUE
@ -198,22 +199,16 @@ void write_packet_downlink_assignment(bitvec * dest, uint8_t tfi, uint32_t tlli
bitvec_write_field(dest, wp,tsc,3); // Training Sequence Code (TSC) = 2
bitvec_write_field(dest, wp,0x0,2); // ARFCN = present
bitvec_write_field(dest, wp,599,10); // ARFCN
bitvec_write_field(dest, wp,arfcn,10); // ARFCN
bitvec_write_field(dest, wp,0x1,1); // switch TFI : on
bitvec_write_field(dest, wp,tfi,5);// TFI
bitvec_write_field(dest, wp,0x1,1); // Power Control Parameters IE = present
bitvec_write_field(dest, wp,0x0,4); // ALPHA power control parameter
bitvec_write_field(dest, wp,0x0,1); // switch GAMMA_TN0 = off
bitvec_write_field(dest, wp,0x0,1); // switch GAMMA_TN1 = off
bitvec_write_field(dest, wp,0x0,1); // switch GAMMA_TN2 = off
bitvec_write_field(dest, wp,0x0,1); // switch GAMMA_TN3 = off
bitvec_write_field(dest, wp,0x0,1); // switch GAMMA_TN4 = off
bitvec_write_field(dest, wp,0x0,1); // switch GAMMA_TN5 = off
bitvec_write_field(dest, wp,0x0,1); // switch GAMMA_TN6 = off
bitvec_write_field(dest, wp,0x1,1); // switch GAMMA_TN7 = on
bitvec_write_field(dest, wp,0x0,5); // GAMMA_TN7
for (i = 0; i < 8; i++)
bitvec_write_field(dest, wp,(tn == i),1); // switch GAMMA_TN[i] = on or off
bitvec_write_field(dest, wp,0x0,5); // GAMMA_TN[tn]
bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME IE not present
bitvec_write_field(dest, wp,0x0,1); // Measurement Mapping struct not present
@ -894,7 +889,8 @@ 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, tbf->ts, tbf->ta, tbf->tsc);
printf("tbf->ts %d\n", tbf->ts);
write_packet_downlink_assignment(packet_downlink_assignment_vec, tbf->tfi, tbf->tlli, tbf->arfcn, tbf->ts, tbf->ta, tbf->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);

2
src/gprs_rlcmac.h
View File

@ -66,6 +66,8 @@ struct gprs_rlcmac_tbf {
extern struct llist_head gprs_rlcmac_tbfs;
int select_pdch(uint8_t *_trx, uint8_t *_ts);
int tfi_alloc();
struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi, uint8_t trx, uint8_t ts);