diff options
Diffstat (limited to 'openbsc/src/abis_rsl.c')
| -rw-r--r-- | openbsc/src/abis_rsl.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c index 4b2a7fccf..5c1967d38 100644 --- a/openbsc/src/abis_rsl.c +++ b/openbsc/src/abis_rsl.c @@ -356,6 +356,95 @@ int rsl_sacch_filling(struct gsm_bts_trx *trx, u_int8_t type, return abis_rsl_sendmsg(msg); } +int rsl_chan_bs_power_ctrl(struct gsm_lchan *lchan, unsigned int fpc, int db) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + u_int8_t chan_nr = lchan2chan_nr(lchan); + + db = abs(db); + if (db > 30) + return -EINVAL; + + lchan->bs_power = db/2; + if (fpc) + lchan->bs_power |= 0x10; + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_BS_POWER_CONTROL); + dh->chan_nr = chan_nr; + + msgb_tv_put(msg, RSL_IE_BS_POWER, lchan->bs_power); + + msg->trx = lchan->ts->trx; + + return abis_rsl_sendmsg(msg); +} + +/* determine power control level for given dBm value, as indicated + * by the tables in chapter 4.1.1 of GSM TS 05.05 */ +static int ms_pwr_ctl_lvl(struct gsm_bts *bts, unsigned int dbm) +{ + switch (bts->band) { + case GSM_BAND_400: + case GSM_BAND_900: + case GSM_BAND_850: + if (dbm >= 39) + return 0; + else if (dbm < 5) + return 19; + else + return 2 + ((39 - dbm) / 2); + break; + case GSM_BAND_1800: + if (dbm >= 36) + return 29; + else if (dbm >= 34) + return 30; + else if (dbm >= 32) + return 31; + else + return (30 - dbm) / 2; + break; + case GSM_BAND_1900: + if (dbm >= 33) + return 30; + else if (dbm >= 32) + return 31; + else + return (30 - dbm) / 2; + break; + } + return -EINVAL; +} + +int rsl_chan_ms_power_ctrl(struct gsm_lchan *lchan, unsigned int fpc, int dbm) +{ + struct abis_rsl_dchan_hdr *dh; + struct msgb *msg = rsl_msgb_alloc(); + u_int8_t chan_nr = lchan2chan_nr(lchan); + int ctl_lvl; + + ctl_lvl = ms_pwr_ctl_lvl(lchan->ts->trx->bts, dbm); + if (ctl_lvl < 0) + return ctl_lvl; + + lchan->ms_power = ctl_lvl; + + if (fpc) + lchan->ms_power |= 0x20; + + dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); + init_dchan_hdr(dh, RSL_MT_MS_POWER_CONTROL); + dh->chan_nr = chan_nr; + + msgb_tv_put(msg, RSL_IE_MS_POWER, lchan->ms_power); + + msg->trx = lchan->ts->trx; + + return abis_rsl_sendmsg(msg); +} + /* Chapter 8.4.1 */ #if 0 int rsl_chan_activate(struct gsm_bts_trx *trx, u_int8_t chan_nr, |