[PATCH] Handle GPRS 11 bit RACH in osmo-pcu

A function is_single_block is added to get request type of RACH. GPRS 11 bit RACH is handled. --- src/bts.cpp | 56 ++++++++++++++++++++++++++++++++++++++++++++++---------- src/bts.h | 2 ++ 2 files changed, 48 insertions(+), 10 deletions(-) diff --git a/src/bts.cpp b/src/bts.cpp index 62b00c4..2166132 100644 --- a/src/bts.cpp +++ b/src/bts.cpp @@ -473,18 +473,11 @@ int BTS::rcv_rach(uint16_t ra, uint32_t Fn, int16_t qta, uint8_t is_11bit, uint16_t ta; rach_frame(); - LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " "one:\n"); - if ((ra & 0xf8) == 0x70) { - LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " - "allocation\n"); - sb = 1; - } else if (m_bts.force_two_phase) { - LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, " - "but we force two phase access\n"); - sb = 1; - } + + sb = is_single_block(ra, burst, is_11bit); + if (qta < 0) qta = 0; if (qta > 252) @@ -556,6 +549,49 @@ int BTS::rcv_rach(uint16_t ra, uint32_t Fn, int16_t qta, uint8_t is_11bit, return 0; } +uint8_t BTS::is_single_block(uint16_t ra, enum ph_burst_type burst, + uint8_t is_11bit) +{ + uint8_t sb = 0; + + if ((is_11bit == 0) && (burst == GSM_L1_BURST_TYPE_ACCESS_0)) { + if ((ra & 0xf8) == 0x70) { + LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " + "allocation\n"); + sb = 1; + } else if (m_bts.force_two_phase) { + LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase " + "access, but we force two phase access\n"); + sb = 1; + } + } else if ((is_11bit == 1) && (burst == GSM_L1_BURST_TYPE_ACCESS_0)) { + if ((ra & 0x7e0) == 0x0600) { + LOGP(DRLCMAC, LOGL_DEBUG, "GPRS 11 bit RACH received. " + "MS requests single block allocation\n"); + sb = 1; + } else if (m_bts.force_two_phase) { + LOGP(DRLCMAC, LOGL_DEBUG, "GPRS 11 bit RACH received." + "MS requests single phase access but we force " + "two phase access\n"); + sb = 1; + } + } else if ((is_11bit == 1) && ((burst == GSM_L1_BURST_TYPE_ACCESS_1) || + (burst == GSM_L1_BURST_TYPE_ACCESS_2))) { + if ((ra & 0x7e0) == 0x0600) { + LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS 11 bit RACH received. " + "MS requests single block allocation\n"); + sb = 1; + } else if (m_bts.force_two_phase) { + LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS 11 bit RACH received. " + "MS requests single phase access but we force " + "two phase access\n"); + sb = 1; + } + } + + return sb; +} + /* depending on the current TBF, we assign on PACCH or AGCH */ void BTS::trigger_dl_ass( struct gprs_rlcmac_dl_tbf *dl_tbf, diff --git a/src/bts.h b/src/bts.h index f0fe970..1c5b749 100644 --- a/src/bts.h +++ b/src/bts.h @@ -276,6 +276,8 @@ public: int tfi_find_free(enum gprs_rlcmac_tbf_direction dir, uint8_t *_trx, int8_t use_trx); int rcv_imm_ass_cnf(const uint8_t *data, uint32_t fn); + uint8_t is_single_block(uint16_t ra, enum ph_burst_type burst, + uint8_t is_11bit); int rcv_rach(uint16_t ra, uint32_t Fn, int16_t qta, uint8_t is_11bit, enum ph_burst_type burst); -- 2.5.0