Introduce NACC support
A new nacc_fsm is introduced per MS object, with its partner priv
structure struct nacc_fsm_ctx, which exists and is available in the MS
object only during the duration of the NACC procedure.
The NACC context is created on an MS whenever a Pkt Cell Change
Notification is received on Uplink RLCMAC, which asks for neighbor
information of a given ARFCN+BSIC.
First, the target ARFCN+BSIC needs to be translated into a CGI-PS
(RAC+CI) address. That's done by asking the BSC through the Neighbour
Resolution Service available in osmo-bsc using the CTRL interface.
Once the CGI-PS of the target cell is known, PCU starts a RIM RAN-INFO
request against the SGSN (which will route the request as needed), and
wait for a response containing the SI bits from the target cell.
After the SI are received, the scheduler is instructed to eventually
poll a TBF for the MS originating the CCN, so that we can send the SI
encapsulated into multiple Packet Neighbor Cell Data messages on the
downlink.
One all the SI bits are sent, the scheduler is instructed to send a
Packet Cell Change Continue message.
Once the message above has been sent, the FSM autodestroys itself.
Caches are also introduced in this patch which allows for re-using
recently known translations ARFCN+BSIC -> CGI-PS and CGI-PS -> SI_INFO
respectively.
Change-Id: Id35f40d05f3e081f32fddbf1fa34cb338db452ca
diff --git a/src/bts.h b/src/bts.h
index 7f437e3..ea15caf 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -2,6 +2,7 @@
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2013 by Holger Hans Peter Freyther
+ * Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -125,6 +126,9 @@
CTR_PKT_UL_ASSIGNMENT,
CTR_PKT_ACCESS_REJ,
CTR_PKT_DL_ASSIGNMENT,
+ CTR_PKT_CELL_CHG_NOTIFICATION,
+ CTR_PKT_CELL_CHG_CONTINUE,
+ CTR_PKT_NEIGH_CELL_DATA,
CTR_RLC_RECV_CONTROL,
CTR_PUA_POLL_TIMEDOUT,
CTR_PUA_POLL_FAILED,
@@ -337,6 +341,7 @@
void bts_set_max_mcs_dl(struct gprs_rlcmac_bts *bts, uint8_t mcs_dl);
void bts_set_max_mcs_ul(struct gprs_rlcmac_bts *bts, uint8_t mcs_ul);
bool bts_cs_dl_is_supported(const struct gprs_rlcmac_bts *bts, enum CodingScheme cs);
+const struct llist_head* bts_ms_list(struct gprs_rlcmac_bts *bts);
#ifdef __cplusplus
}
#endif