diff options
Diffstat (limited to 'openbsc/src/gsm_utils.c')
| -rw-r--r-- | openbsc/src/gsm_utils.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/openbsc/src/gsm_utils.c b/openbsc/src/gsm_utils.c index ddfd7f3de..9439993db 100644 --- a/openbsc/src/gsm_utils.c +++ b/openbsc/src/gsm_utils.c @@ -90,8 +90,10 @@ int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm) return 0; else if (dbm < 5) return 19; - else + else { + /* we are guaranteed to have (5 <= dbm < 39) */ return 2 + ((39 - dbm) / 2); + } break; case GSM_BAND_1800: if (dbm >= 36) @@ -100,16 +102,24 @@ int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm) return 30; else if (dbm >= 32) return 31; - else + else if (dbm == 31) + return 0; + else { + /* we are guaranteed to have (0 <= dbm < 31) */ return (30 - dbm) / 2; + } break; case GSM_BAND_1900: if (dbm >= 33) return 30; else if (dbm >= 32) return 31; - else + else if (dbm == 31) + return 0; + else { + /* we are guaranteed to have (0 <= dbm < 31) */ return (30 - dbm) / 2; + } break; } return -EINVAL; @@ -150,6 +160,28 @@ int ms_pwr_dbm(enum gsm_band band, u_int8_t lvl) return -EINVAL; } +/* According to TS 08.05 Chapter 8.1.4 */ +int rxlev2dbm(u_int8_t rxlev) +{ + if (rxlev > 63) + rxlev = 63; + + return -110 + rxlev; +} + +/* According to TS 08.05 Chapter 8.1.4 */ +u_int8_t dbm2rxlev(int dbm) +{ + int rxlev = dbm + 110; + + if (rxlev > 63) + rxlev = 63; + else if (rxlev < 0) + rxlev = 0; + + return rxlev; +} + void generate_backtrace() { int i, nptrs; |