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edge: Support EGPRS in IMM ASSIGNMENT 

Tell the MS to use EGPRS if EGPRS is enabled on the TBF.

Note that only downlink TBF will be supported so far. Thus
single-phase uplink assignments may not work properly.

Sponsored-by: On-Waves ehf
This commit is contained in:
Jacob Erlbeck 2016-02-01 16:39:52 +01:00
parent 2647a337a8
commit be80c3670e
1 changed files with 25 additions and 0 deletions
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25
src/encoding.cpp
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@ -72,6 +72,14 @@ static int write_ia_rest_downlink(
bitvec_write_field(dest, wp,0x0,1); // P0 not present
// bitvec_write_field(dest, wp,0x1,1); // P0 not present
// bitvec_write_field(dest, wp,0xb,4);
if (tbf->is_egprs_enabled()) {
/* see GMS 44.018, 10.5.2.16 */
unsigned int ws_enc = (tbf->m_window.ws() - 64) / 32;
bitvec_write_field_lh(dest, wp, 1, 1); // "H"
bitvec_write_field(dest, wp, ws_enc,5); // EGPRS Window Size
bitvec_write_field(dest, wp, 0x0,2); // LINK_QUALITY_MEASUREMENT_MODE
bitvec_write_field(dest, wp, 0,1); // BEP_PERIOD2 not present
}
return 0;
}
@ -82,6 +90,8 @@ static int write_ia_rest_uplink(
uint8_t usf, uint32_t fn,
uint8_t alpha, uint8_t gamma, int8_t ta_idx)
{
OSMO_ASSERT(!tbf || !tbf->is_egprs_enabled());
// GMS 04.08 10.5.2.37b 10.5.2.16
bitvec_write_field_lh(dest, wp, 3, 2); // "HH"
bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment
@ -126,6 +136,17 @@ static int write_ia_rest_uplink(
return 0;
}
static int write_ia_rest_egprs_uplink(
gprs_rlcmac_ul_tbf *tbf,
bitvec * dest, unsigned& wp,
uint8_t usf, uint32_t fn,
uint8_t alpha, uint8_t gamma, int8_t ta_idx)
{
LOGP(DRLCMACUL, LOGL_ERROR,
"EGPRS Packet Uplink Assignment is not yet implemented\n");
return -EINVAL;
}
/*
* Immediate assignment, sent on the CCCH/AGCH
* see GSM 04.08, 9.1.18 and GSM 44.018, 9.1.18 + 10.5.2.16
@ -185,6 +206,10 @@ int Encoding::write_immediate_assignment(
rc = write_ia_rest_downlink(as_dl_tbf(tbf), dest, wp,
polling, fn,
alpha, gamma, ta_idx);
else if (as_ul_tbf(tbf) && as_ul_tbf(tbf)->is_egprs_enabled())
rc = write_ia_rest_egprs_uplink(as_ul_tbf(tbf), dest, wp,
usf, fn,
alpha, gamma, ta_idx);
else
rc = write_ia_rest_uplink(as_ul_tbf(tbf), dest, wp,
usf, fn,