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-rw-r--r--src/common/rsl.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/src/common/rsl.c b/src/common/rsl.c
index e6fd8b99..25ed279a 100644
--- a/src/common/rsl.c
+++ b/src/common/rsl.c
@@ -1585,6 +1585,47 @@ static int rsl_rx_ms_pwr_ctrl(struct msgb *msg)
return 0;
}
+/* See TS 48.058 Section 9.3.4 */
+static int bs_power_attenuation_dB(uint8_t bs_power)
+{
+ /* the lower nibble contains the number of 2dB steps that the BS power is reduced compared
+ * to its nominal transmit power */
+ return - ((bs_power & 0xF) *2);
+}
+
+/* 8.4.16 BS POWER CONTROL */
+static int rsl_rx_bs_pwr_ctrl(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dch = msgb_l2(msg);
+ struct gsm_lchan *lchan = msg->lchan;
+ struct tlv_parsed tp;
+ uint8_t new_bs_power;
+
+ rsl_tlv_parse(&tp, msgb_l3(msg), msgb_l3len(msg));
+
+ /* 9.3.4 BS Power (M) */
+ if (!TLVP_PRES_LEN(&tp, RSL_IE_BS_POWER, 1))
+ return rsl_tx_error_report(msg->trx, RSL_ERR_MAND_IE_ERROR, &dch->chan_nr, NULL, msg);
+
+ new_bs_power = *TLVP_VAL(&tp, RSL_IE_BS_POWER);
+
+ LOGPLCHAN(lchan, DRSL, LOGL_INFO, "BS POWER CONTROL Attenuation %d -> %d dB\n",
+ bs_power_attenuation_dB(lchan->bs_power), bs_power_attenuation_dB(new_bs_power));
+
+ lchan->bs_power = new_bs_power;
+
+ /* 9.3.31 MS Power Parameters (O) */
+ if (TLVP_PRESENT(&tp, RSL_IE_BS_POWER_PARAM)) {
+ /* Spec explicitly states BTS should perform autonomous
+ * BS power control loop in BTS if 'BS Power Parameters'
+ * IE is present! WE don't support that. */
+ return rsl_tx_error_report(msg->trx, RSL_ERR_OPT_IE_ERROR, &dch->chan_nr, NULL, msg);
+ }
+
+ return 0;
+}
+
+
/* 8.4.20 SACCH INFO MODify */
static int rsl_rx_sacch_inf_mod(struct msgb *msg)
{
@@ -2926,6 +2967,9 @@ static int rsl_rx_dchan(struct gsm_bts_trx *trx, struct msgb *msg)
case RSL_MT_MS_POWER_CONTROL:
ret = rsl_rx_ms_pwr_ctrl(msg);
break;
+ case RSL_MT_BS_POWER_CONTROL:
+ ret = rsl_rx_bs_pwr_ctrl(msg);
+ break;
case RSL_MT_IPAC_PDCH_ACT:
case RSL_MT_IPAC_PDCH_DEACT:
rsl_rx_dyn_pdch(msg, dch->c.msg_type == RSL_MT_IPAC_PDCH_ACT);