/*
* (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de>
* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
- * (C) 2009 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
#include <string.h>
#include <stdio.h>
#include <errno.h>
+#include <ctype.h>
#include "../config.h"
return rxlev;
}
+const char *gsm_band_name(enum gsm_band band)
+{
+ switch (band) {
+ case GSM_BAND_450:
+ return "GSM450";
+ case GSM_BAND_480:
+ return "GSM450";
+ case GSM_BAND_750:
+ return "GSM750";
+ case GSM_BAND_810:
+ return "GSM810";
+ case GSM_BAND_850:
+ return "GSM850";
+ case GSM_BAND_900:
+ return "GSM900";
+ case GSM_BAND_1800:
+ return "DCS1800";
+ case GSM_BAND_1900:
+ return "PCS1900";
+ }
+ return "invalid";
+}
+
+enum gsm_band gsm_band_parse(const char* mhz)
+{
+ while (*mhz && !isdigit(*mhz))
+ mhz++;
+
+ if (*mhz == '\0')
+ return -EINVAL;
+
+ switch (strtol(mhz, NULL, 10)) {
+ case 450:
+ return GSM_BAND_450;
+ case 480:
+ return GSM_BAND_480;
+ case 750:
+ return GSM_BAND_750;
+ case 810:
+ return GSM_BAND_810;
+ case 850:
+ return GSM_BAND_850;
+ case 900:
+ return GSM_BAND_900;
+ case 1800:
+ return GSM_BAND_1800;
+ case 1900:
+ return GSM_BAND_1900;
+ default:
+ return -EINVAL;
+ }
+}
+
+
#ifdef HAVE_EXECINFO_H
#include <execinfo.h>
void generate_backtrace()
free(strings);
}
#endif
+
+enum gsm_band gsm_arfcn2band(uint16_t arfcn)
+{
+ if (arfcn & ARFCN_PCS)
+ return GSM_BAND_1900;
+ else if (arfcn <= 124)
+ return GSM_BAND_900;
+ else if (arfcn >= 955 && arfcn <= 1023)
+ return GSM_BAND_900;
+ else if (arfcn >= 128 && arfcn <= 251)
+ return GSM_BAND_850;
+ else if (arfcn >= 512 && arfcn <= 885)
+ return GSM_BAND_1800;
+ else if (arfcn >= 259 && arfcn <= 293)
+ return GSM_BAND_450;
+ else if (arfcn >= 306 && arfcn <= 340)
+ return GSM_BAND_480;
+ else if (arfcn >= 350 && arfcn <= 425)
+ return GSM_BAND_810;
+ else if (arfcn >= 438 && arfcn <= 511)
+ return GSM_BAND_750;
+ else
+ return GSM_BAND_1800;
+}
+
+/* Convert an ARFCN to the frequency in MHz * 10 */
+uint16_t gsm_arfcn2freq10(uint16_t arfcn, int uplink)
+{
+ uint16_t freq10_ul;
+ uint16_t freq10_dl;
+
+ if (arfcn & ARFCN_PCS) {
+ /* DCS 1900 */
+ arfcn &= ~ARFCN_PCS;
+ freq10_ul = 18502 + 2 * (arfcn-512);
+ freq10_dl = freq10_ul + 800;
+ } else if (arfcn <= 124) {
+ /* Primary GSM + ARFCN 0 of E-GSM */
+ freq10_ul = 8900 + 2 * arfcn;
+ freq10_dl = freq10_ul + 450;
+ } else if (arfcn >= 955 && arfcn <= 1023) {
+ /* E-GSM and R-GSM */
+ freq10_ul = 8900 + 2 * (arfcn - 1024);
+ freq10_dl = freq10_ul + 450;
+ } else if (arfcn >= 128 && arfcn <= 251) {
+ /* GSM 850 */
+ freq10_ul = 8242 + 2 * (arfcn - 128);
+ freq10_dl = freq10_ul + 450;
+ } else if (arfcn >= 512 && arfcn <= 885) {
+ /* DCS 1800 */
+ freq10_ul = 17102 + 2 * (arfcn - 512);
+ freq10_dl = freq10_ul + 950;
+ } else if (arfcn >= 259 && arfcn <= 293) {
+ /* GSM 450 */
+ freq10_ul = 4506 + 2 * (arfcn - 259);
+ freq10_dl = freq10_ul + 100;
+ } else if (arfcn >= 306 && arfcn <= 340) {
+ /* GSM 480 */
+ freq10_ul = 4790 + 2 * (arfcn - 306);
+ freq10_dl = freq10_ul + 100;
+ } else if (arfcn >= 350 && arfcn <= 425) {
+ /* GSM 810 */
+ freq10_ul = 8060 + 2 * (arfcn - 350);
+ freq10_dl = freq10_ul + 450;
+ } else if (arfcn >= 438 && arfcn <= 511) {
+ /* GSM 750 */
+ freq10_ul = 7472 + 2 * (arfcn - 438);
+ freq10_dl = freq10_ul + 300;
+ } else
+ return 0xffff;
+
+ if (uplink)
+ return freq10_ul;
+ else
+ return freq10_dl;
+}
+
+void gsm_fn2gsmtime(struct gsm_time *time, uint32_t fn)
+{
+ time->fn = fn;
+ time->t1 = time->fn / (26*51);
+ time->t2 = time->fn % 26;
+ time->t3 = time->fn % 51;
+ time->tc = (time->fn / 51) % 8;
+}
+
+uint32_t gsm_gsmtime2fn(struct gsm_time *time)
+{
+ /* TS 05.02 Chapter 4.3.3 TDMA frame number */
+ return (51 * ((time->t3 - time->t2 + 26) % 26) + time->t3 + (26 * 51 * time->t1));
+}
+
+/* TS 03.03 Chapter 2.6 */
+int gprs_tlli_type(uint32_t tlli)
+{
+ if ((tlli & 0xc0000000) == 0xc0000000)
+ return TLLI_LOCAL;
+ else if ((tlli & 0xc0000000) == 0x80000000)
+ return TLLI_FOREIGN;
+ else if ((tlli & 0xf8000000) == 0x78000000)
+ return TLLI_RANDOM;
+ else if ((tlli & 0xf8000000) == 0x70000000)
+ return TLLI_AUXILIARY;
+
+ return TLLI_RESERVED;
+}
+
+uint32_t gprs_tmsi2tlli(uint32_t p_tmsi, enum gprs_tlli_type type)
+{
+ uint32_t tlli;
+ switch (type) {
+ case TLLI_LOCAL:
+ tlli = p_tmsi | 0xc0000000;
+ break;
+ case TLLI_FOREIGN:
+ tlli = (p_tmsi & 0x3fffffff) | 0x80000000;
+ break;
+ default:
+ tlli = 0;
+ break;
+ }
+ return tlli;
+}