diff options
| author | Max <msuraev@sysmocom.de> | 2016-07-14 11:35:17 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2016-07-16 21:00:00 +0000 |
| commit | edb57e7709c130a664fb2d9f807d96d0e283c675 (patch) | |
| tree | 1949401974deb3f71e146b416e7be29415ec231b /include/osmocom/gsm/protocol | |
| parent | 4a62dbbfa9260cd0c079f043b57f9adaedfad38e (diff) | |
Add function to check TA validity
Check if given Timing Advance is valid according to 3GPP TS 44.018 §
10.5.2.40.
Change-Id: I5cb6149d6e36fda8cb3f557e4d6d3a724da805a5
Related: OS#1545
Diffstat (limited to 'include/osmocom/gsm/protocol')
| -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 § 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; |