diff options
| -rw-r--r-- | include/osmocom/gsm/protocol/gsm_04_08.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/osmocom/gsm/protocol/gsm_04_08.h b/include/osmocom/gsm/protocol/gsm_04_08.h index e442c7f9..7efd7e87 100644 --- a/include/osmocom/gsm/protocol/gsm_04_08.h +++ b/include/osmocom/gsm/protocol/gsm_04_08.h @@ -947,6 +947,16 @@ static inline uint8_t gsm48_hdr_trans_id(const struct gsm48_hdr *hdr) return (hdr->proto_discr & 0xf0) >> 4; } +/*! \brief Check if TA is valid according to 3GPP TS 44.018 ยง 10.5.2.40 + * \param[in] ta Timing Advance value + * \returns true if ta is valid, false otherwise + * Note: Rules for GSM400 band are ignored as it's not implemented in practice. + */ +static inline bool gsm48_ta_is_valid(uint8_t ta) +{ + return (ta < 64); +} + static inline uint8_t gsm48_hdr_trans_id_flip_ti(const struct gsm48_hdr *hdr) { return gsm48_hdr_trans_id(hdr) ^ 0x08; |