diff options
| author | Vadim Yanitskiy <vyanitskiy@sysmocom.de> | 2022-03-02 01:58:00 +0700 |
|---|---|---|
| committer | Vadim Yanitskiy <vyanitskiy@sysmocom.de> | 2022-03-03 16:58:54 +0700 |
| commit | 03fba6ddf04f386a613c26759d8ee248ecfe137a (patch) | |
| tree | 9f7232fd55edbc45f3578245e9254fd7928edb56 | |
| parent | bab6a5f74958fc2ab952b1adce1809cc4e6edb54 (diff) | |
bitvec2freq_list(): fix handling of E-GSM ARFCNs
According to 3GPP TS 44.018, section 10.5.2.1b.2, only ARFCN values
in range 1..124 can be encoded using the 'bit map 0' format. Before
this patch, ARFCN values belonging to E-GSM band (0, 975..1023) were
ignored in bitvec2freq_list(), and thus not present in the resulting
Cell Channel Description IE.
Change-Id: I17739e6845cd84e2a81bc406dd532541f7c52cb6
Related: SYS#5854
| -rw-r--r-- | src/osmo-bsc/system_information.c | 27 | ||||
| -rw-r--r-- | tests/gsm0408/gsm0408_test.ok | 2 |
2 files changed, 19 insertions, 10 deletions
diff --git a/src/osmo-bsc/system_information.c b/src/osmo-bsc/system_information.c index 7ec613c41..20685a9fa 100644 --- a/src/osmo-bsc/system_information.c +++ b/src/osmo-bsc/system_information.c @@ -504,20 +504,29 @@ static int bitvec2freq_list(uint8_t *chan_list, const struct bitvec *bv, bool pgsm = false; memset(chan_list, 0, 16); - if (bts->band == GSM_BAND_900 - && bts->c0->arfcn >= 1 && bts->c0->arfcn <= 124) + /* According to 3GPP TS 44.018, section 10.5.2.1b.2, only ARFCN values + * in range 1..124 can be encoded using the 'bit map 0' format. */ + if (bts->band == GSM_BAND_900) pgsm = true; + /* Check presence of E-GSM ARFCN 0 */ + if (pgsm && bitvec_get_bit_pos(bv, 0) == ONE) + pgsm = false; + /* Check presence of E-GSM ARFCNs 975..1023 */ + for (i = 975; pgsm && i <= 1023; i++) { + if (bitvec_get_bit_pos(bv, i) == ONE) + pgsm = false; + } + /* P-GSM-only handsets only support 'bit map 0 format' */ if (!bis && !ter && pgsm) { chan_list[0] = 0; - for (i = 0; i < bv->data_len*8; i++) { - if (i >= 1 && i <= 124 - && bitvec_get_bit_pos(bv, i)) { - rc = freq_list_bm0_set_arfcn(chan_list, i); - if (rc < 0) - return rc; - } + for (i = 1; i <= 124; i++) { + if (!bitvec_get_bit_pos(bv, i)) + continue; + rc = freq_list_bm0_set_arfcn(chan_list, i); + if (rc < 0) + return rc; } return 0; } diff --git a/tests/gsm0408/gsm0408_test.ok b/tests/gsm0408/gsm0408_test.ok index 38b5b4bc0..264a9c774 100644 --- a/tests/gsm0408/gsm0408_test.ok +++ b/tests/gsm0408/gsm0408_test.ok @@ -247,6 +247,6 @@ BTS allocation OK in test_cell_chan_desc() Testing generation of the Cell Channel Description IE: Case a) only the BCCH carrier: 10 Case b) more carriers from P-GSM band: 1 3 10 64 99 124 -Case c) more carriers from E-GSM band: 1 3 10 64 99 124 +Case c) more carriers from E-GSM band: 0 3 10 64 99 124 975 1001 1023 BTS deallocated OK in test_cell_chan_desc() Done. |