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ae2a3255a5
While experimenting with CSFB, it was observed that when the UE returns to E-UTRAN after a CS call, the UE performs a Tracking Area Update with a combined Tracking Area/Location Area update and IMSI attach. Currently, Open5GS's MME simply responds with a TAU Accept message but does not inform the MSC/VLR. As a result, no further MT (Mobile Terminated) CS/SMS services are possible in cases where the MSC/VLR only attempts paging on GERAN. However, some MSC/VLR implementations with fast fallback may still attempt paging on E-UTRAN, allowing MT CS/SMS services to function intermittently. According to 3GPP TS 29.118 Section 5.2.2 Procedures in the MME, specifically Section 5.2.2.2.1, if the timer Ts6-1 is not running, the MME shall start the location update for non-EPS services procedure upon receiving a combined Tracking Area Update Request indicating combined TA/LA updating with IMSI attach. However, SGs timers are not implemented in Open5GS, which is a separate issue. To comply with the specification and ensure that the MSC/VLR is informed when the UE becomes reachable via SGs, the following changes have been implemented: 1. Delay UEContextReleaseCommand: When the active_flag is set to 0, the UEContextReleaseCommand is now delayed until the MME receives the TAU Complete message from the UE. This ensures that the UE has acknowledged the new P-TMSI before the network releases the context, maintaining proper synchronization between the UE and the network. 2. Include Mobile Identity Only When P-TMSI Changes: The Mobile Identity is now included in the Attach/TAU Accept messages only when the MSC/VLR updates the P-TMSI. This ensures that the UE receives the Mobile Identity information solely when there is an actual change in the P-TMSI, preventing unnecessary or incorrect handling of TAU Complete messages. 3. Send SGsAP-REALLOCATION-COMPLETE Conditionally: The SGsAP-REALLOCATION-COMPLETE message is now sent to the MSC/VLR only upon receiving a Attach/TAU Complete message from the UE. This confirmation indicates that the UE has successfully updated its P-TMSI, ensuring that the MSC/VLR is accurately informed of the change. 4. Handle P-TMSI Confirmation: When the MSC/VLR updates the P-TMSI, Open5GS stores the new P-TMSI in the next field of the mme_ue structure. Upon receiving the TAU Complete message from the UE, indicating acknowledgment of the new P-TMSI, Open5GS confirms the update by transferring the P-TMSI from the next field to the current field. This ensures that the MME maintains an accurate and up-to-date record of the P-TMSI as confirmed by the UE.
229 lines
5.7 KiB
C
229 lines
5.7 KiB
C
/*
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* Copyright (C) 2019,2020 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "test-common.h"
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#define TEST_SGSAP_MAX_MESSAGE 64
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ogs_pkbuf_t *test_sgsap_location_update_accept(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"0a01089999073746 000006040509f107 09260e05f49ee88e 64",
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"0a01089999073746 000006040509f107 09260e05f49ee88e 65",
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"0a01089999073746 000006040509f107 09260e05f49ee88e 66",
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"0a01087942120000 000030040527f412 c9580e05f437ab9c c5",
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"",
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"",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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25,
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25,
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25,
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25,
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0,
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0,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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ogs_pkbuf_t *test_sgsap_location_update_reject(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"0b01089999073746 0000060f01030405 09f1070926",
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"",
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"",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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21,
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0,
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0,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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ogs_pkbuf_t *test_sgsap_imsi_detach_ack(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"1401089999073746 000006",
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"",
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"",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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11,
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0,
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0,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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ogs_pkbuf_t *test_sgsap_paging_request(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"0101089999073746 000006021003766c 72076578616d706c 65036e6574200101"
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"040509f1070926",
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"0101089999073746 000005021003766c 72076578616d706c 65036e6574200101"
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"040509f1070926", /* Paging-Reject */
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"0101089999073746 000006021003766c 72076578616d706c 65036e6574200102"
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"040509f1070926", /* Paging-Request with SMS */
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/* Paging-Request for crash-test */
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"0101089999073746 000006021003766c 72076578616d706c 65036e6574200101"
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"040527f412c958",
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"",
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"",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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39,
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39,
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39,
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39,
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0,
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0,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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ogs_pkbuf_t *test_sgsap_reset_indication(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"15021003766c7207 6578616d706c6503 6e6574",
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"",
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"",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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19,
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0,
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0,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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ogs_pkbuf_t *test_sgsap_release_request(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"1b01089999073746 000006",
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"",
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"",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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11,
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0,
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0,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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ogs_pkbuf_t *test_sgsap_downlink_unitdata(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"0701089999073746 0000061626090123 0100079144775810 0650001700048032"
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"2400009160404044 150009c8329bfd06 4d9b53",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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51,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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ogs_pkbuf_t *test_sgsap_mm_information_request(int i)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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const char *payload[TEST_SGSAP_MAX_MESSAGE] = {
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"1a01087942120000 0000301714430483 d46413450483d464 1347917071028401"
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"29",
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};
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uint16_t len[TEST_SGSAP_MAX_MESSAGE] = {
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33,
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};
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char hexbuf[OGS_HUGE_LEN];
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pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
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ogs_assert(pkbuf);
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ogs_pkbuf_put_data(pkbuf,
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ogs_hex_from_string(payload[i], hexbuf, sizeof(hexbuf)), len[i]);
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return pkbuf;
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}
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