Start creating a paging layer...
You can request to open a channel to a MS and the paging layer
will call you once the channel is allocated. Internally the CCCH
Load Indication will be handled and retry to page a terminal.
diff --git a/src/paging.c b/src/paging.c
new file mode 100644
index 0000000..5578130
--- /dev/null
+++ b/src/paging.c
@@ -0,0 +1,83 @@
+/* Paging helper and manager.... */
+/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+/*
+ * Relevant specs:
+ * 12.21:
+ * - 9.4.12 for CCCH Local Threshold
+ *
+ * 05.58:
+ * - 8.5.2 CCCH Load indication
+ * - 9.3.15 Paging Load
+ *
+ * Approach:
+ * - Send paging command to subscriber
+ * - On Channel Request we will remember the reason
+ * - After the ACK we will request the identity
+ * - Then we will send assign the gsm_subscriber and
+ * - and call a callback
+ */
+
+#include <openbsc/paging.h>
+#include <openbsc/debug.h>
+
+static LLIST_HEAD(managed_bts);
+
+static int page_pending_request(struct paging_bts *bts,
+ struct gsm_subscriber *subscr) {
+ struct paging_request *req;
+
+ llist_for_each_entry(req, &bts->pending_requests, entry) {
+ if (subscr == req->subscr)
+ return 1;
+ }
+
+ return 0;
+}
+
+struct paging_bts* page_allocate(struct gsm_bts *bts) {
+ struct paging_bts *page;
+
+ page = (struct paging_bts *)malloc(sizeof(*page));
+ memset(page, 0, sizeof(*page));
+ llist_add_tail(&page->bts_list, &managed_bts);
+
+ return page;
+}
+
+void page_request(struct gsm_bts *bts, struct gsm_subscriber *subscr) {
+ struct paging_bts *bts_entry;
+ struct paging_request *req;
+
+ req = (struct paging_request *)malloc(sizeof(*req));
+ req->subscr = subscr_get(subscr);
+ req->bts = bts;
+
+ llist_for_each_entry(bts_entry, &managed_bts, bts_list) {
+ if (bts == bts_entry->bts && !page_pending_request(bts_entry, subscr)) {
+ llist_add_tail(&req->entry, &bts_entry->pending_requests);
+ return;
+ }
+ }
+
+ DEBUGP(DPAG, "Paging request for not mnaged BTS\n");
+ free(req);
+ return;
+}