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Add function to make Uplink Measurement 

It assembles RSL Uplink Measurement IE according to 3GPP TS 08.58
§9.3.25. The function is based on lchan_build_rsl_ul_meas() from OsmoBTS
but optionally includes DTX information.

Change-Id: Ib37107bcc9909e5105ea711de42d3fb1db7e8d9e
Reviewed-on: https://gerrit.osmocom.org/44
Tested-by: Jenkins Builder
Reviewed-by: Harald Welte <laforge@gnumonks.org>
This commit is contained in:
Max 2016-05-11 17:33:17 +02:00 committed by Holger Freyther
parent fe65fa7e36
commit 764b022fc6
3 changed files with 26 additions and 0 deletions
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4
include/osmocom/gsm/meas_rep.h
View File

@ -1,6 +1,7 @@
#pragma once
#include <stdint.h>
#include <stdbool.h>
/* RX Level and RX Quality */
struct gsm_rx_lev_qual {
@ -24,3 +25,6 @@ enum meas_rep_field {
MEAS_REP_UL_RXQUAL_FULL,
MEAS_REP_UL_RXQUAL_SUB,
};
size_t gsm0858_rsl_ul_meas_enc(struct gsm_meas_rep_unidir *mru, bool dtxd_used,
uint8_t *buf);

20
src/gsm/gsm_utils.c
View File

@ -66,11 +66,13 @@
#include <osmocom/core/utils.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gsm/meas_rep.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
@ -335,6 +337,24 @@ int gsm_7bit_encode_n_ussd(uint8_t *result, size_t n, const char *data, int *oct
return y;
}
/*! \brief Build the RSL uplink measurement IE (3GPP TS 08.58 § 9.3.25)
* \param[in] mru Unidirectional measurement report structure
* \param[in] dtxd_used Indicates if DTXd was used during measurement report
* period
* \param[out] buf Pre-allocated bufer for storing IE
* \returns Number of bytes filled in buf
*/
size_t gsm0858_rsl_ul_meas_enc(struct gsm_meas_rep_unidir *mru, bool dtxd_used,
uint8_t *buf)
{
buf[0] = dtxd_used ? (1 << 6) : 0;
buf[0] |= (mru->full.rx_lev & 0x3f);
buf[1] = (mru->sub.rx_lev & 0x3f);
buf[2] = ((mru->full.rx_qual & 7) << 3) | (mru->sub.rx_qual & 7);
return 3;
}
/* convert power class to dBm according to GSM TS 05.05 */
unsigned int ms_class_gmsk_dbm(enum gsm_band band, int class)
{

2
src/gsm/libosmogsm.map
View File

@ -92,6 +92,8 @@ gsm0808_create_reset;
gsm0808_create_sapi_reject;
gsm0808_prepend_dtap_header;
gsm0858_rsl_ul_meas_enc;
gsm338_get_sms_alphabet;
gsm340_gen_oa;