From: Max msuraev@sysmocom.de

This function returns the number of bits necessary to pack osmo_earfcn into Repeated E-UTRAN Neighbour Cells IE (3GPP TS 44.018 Table 10.5.2.33b.1). --- include/osmocom/gsm/sysinfo.h | 1 + src/gsm/libosmogsm.map | 1 + src/gsm/sysinfo.c | 24 ++++++++++++++++++++++++ 3 files changed, 26 insertions(+)

diff --git a/include/osmocom/gsm/sysinfo.h b/include/osmocom/gsm/sysinfo.h index cb7e10d..c7972f4 100644 --- a/include/osmocom/gsm/sysinfo.h +++ b/include/osmocom/gsm/sysinfo.h @@ -66,6 +66,7 @@ typedef uint8_t sysinfo_buf_t[GSM_MACBLOCK_LEN]; extern const struct value_string osmo_sitype_strs[_MAX_SYSINFO_TYPE]; int osmo_earfcn_add(struct osmo_earfcn_si2q *e, uint16_t arfcn, uint8_t meas_bw); int osmo_earfcn_del(struct osmo_earfcn_si2q *e, uint16_t arfcn); +size_t osmo_earfcn_bit_size(const struct osmo_earfcn_si2q *e); void osmo_earfcn_init(struct osmo_earfcn_si2q *e); uint8_t osmo_sitype2rsl(enum osmo_sysinfo_type si_type); enum osmo_sysinfo_type osmo_rsl2sitype(uint8_t rsl_si); diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map index a3e4e14..6886a6c 100644 --- a/src/gsm/libosmogsm.map +++ b/src/gsm/libosmogsm.map @@ -31,6 +31,7 @@ dbm2rxlev;

osmo_earfcn_add; osmo_earfcn_del; +osmo_earfcn_bit_size; osmo_earfcn_init;

gprs_cipher_gen_input_i; diff --git a/src/gsm/sysinfo.c b/src/gsm/sysinfo.c index 42e717f..3ec5444 100644 --- a/src/gsm/sysinfo.c +++ b/src/gsm/sysinfo.c @@ -144,6 +144,30 @@ int osmo_earfcn_add(struct osmo_earfcn_si2q *e, uint16_t arfcn, uint8_t meas_bw) return -ENOMEM; }

+/*! \brief Return number of bits necessary to represent earfcn struct as + * Repeated E-UTRAN Neighbour Cells IE from 3GPP TS 44.018 Table 10.5.2.33b.1 + * \param[in,out] e earfcn struct + * \returns number of bits + */ +size_t osmo_earfcn_bit_size(const struct osmo_earfcn_si2q *e) +{ + /* 1 stop bit + 5 bits for THRESH_E-UTRAN_high */ + size_t i, bits = 6; + for (i = 0; i < e->length; i++) { + if (e->arfcn[i] != OSMO_EARFCN_INVALID) { + bits += 17; + if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i]) + bits++; + else + bits += 4; + } + } + bits += (e->prio_valid) ? 4 : 1; + bits += (e->thresh_lo_valid) ? 6 : 1; + bits += (e->qrxlm_valid) ? 6 : 1; + return bits; +} + /*! \brief Delete arfcn (and corresponding measurement bandwith) from earfcn * struct * \param[in,out] e earfcn struct