diff options
| -rw-r--r-- | include/osmo-bts/l1sap.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/osmo-bts/l1sap.h b/include/osmo-bts/l1sap.h index 0e564068..6373ba84 100644 --- a/include/osmo-bts/l1sap.h +++ b/include/osmo-bts/l1sap.h @@ -32,7 +32,10 @@ /* PTCH layout from frame number */ #define L1SAP_FN2MACBLOCK(fn) ((fn % 52) / 4) #define L1SAP_FN2PTCCHBLOCK(fn) ((fn / 104) & 3) -#define L1SAP_IS_PTCCH(fn) ((fn % 52) == 12) + +/* Calculate PTCCH occurrence, See also 3GPP TS 05.02, Clause 7, Table 6 of 9 */ +#define L1SAP_IS_PTCCH(fn) (((fn % 52) == 12) || ((fn % 52) == 38)) + static const uint8_t fill_frame[GSM_MACBLOCK_LEN] = { 0x03, 0x03, 0x01, 0x2B, 0x2B, 0x2B, 0x2B, 0x2B, 0x2B, 0x2B, |