diff options
Diffstat (limited to 'src/gsm')
| -rw-r--r-- | src/gsm/libosmogsm.map | 1 | ||||
| -rw-r--r-- | src/gsm/sysinfo.c | 27 |
2 files changed, 22 insertions, 6 deletions
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map index 97fd2b45..8fb9878a 100644 --- a/src/gsm/libosmogsm.map +++ b/src/gsm/libosmogsm.map @@ -48,6 +48,7 @@ dbm2rxlev; osmo_earfcn_add; osmo_earfcn_del; osmo_earfcn_bit_size; +osmo_earfcn_bit_size_ext; osmo_earfcn_init; gprs_cipher_gen_input_i; diff --git a/src/gsm/sysinfo.c b/src/gsm/sysinfo.c index 3ec54448..b5ebd57d 100644 --- a/src/gsm/sysinfo.c +++ b/src/gsm/sysinfo.c @@ -151,15 +151,30 @@ int osmo_earfcn_add(struct osmo_earfcn_si2q *e, uint16_t arfcn, uint8_t meas_bw) */ size_t osmo_earfcn_bit_size(const struct osmo_earfcn_si2q *e) { + return osmo_earfcn_bit_size_ext(e, 0); +} + +/*! \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 + * \param[in] offset into earfcn struct: how many EARFCNs to skip while estimating size + * \returns number of bits + */ +size_t osmo_earfcn_bit_size_ext(const struct osmo_earfcn_si2q *e, size_t offset) +{ /* 1 stop bit + 5 bits for THRESH_E-UTRAN_high */ - size_t i, bits = 6; + size_t i, bits = 6, skip = 0; 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; + if (skip < offset) + skip++; + else { + bits += 17; + if (OSMO_EARFCN_MEAS_INVALID == e->meas_bw[i]) + bits++; + else + bits += 4; + } } } bits += (e->prio_valid) ? 4 : 1; |