From 839b0f264f1e20ebf41a232808438ffba972be65 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Thu, 23 May 2019 20:15:29 +0200 Subject: rsl: Implement parsing of BS Power Control message Change-Id: Id144a7e468f730e3cdaefa4cf2ad51c6106310a2 --- src/common/rsl.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) (limited to 'src/common/rsl.c') 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); -- cgit v1.2.3