[rr] Send a Channel Release before deactivating the channel
After auto releasing a channel the next paging request will
not be immediately answered. The hypothesis was that we do
not release the channel properly. Implementing Channel Release
of GSM 04.08 should have fixed it, but it didn't. According
to the wireshark dissectors the message is correct though.
- Add the RR cause values to gsm_04_08.
- Implement the Channel Release message
- Invoke the release channel function before deallocating
the lchan.
diff --git a/include/openbsc/gsm_04_08.h b/include/openbsc/gsm_04_08.h
index e781677..cc93ff9 100644
--- a/include/openbsc/gsm_04_08.h
+++ b/include/openbsc/gsm_04_08.h
@@ -375,6 +375,27 @@
GSM48_CAUSE_LOC_NET_BEYOND = 0x0a,
};
+/* Section 10.5.2.31 RR Cause / Table 10.5.70 */
+enum gsm48_rr_cause {
+ GSM48_RR_CAUSE_NORMAL = 0x00,
+ GSM48_RR_CAUSE_ABNORMAL_UNSPEC = 0x01,
+ GSM48_RR_CAUSE_ABNORMAL_UNACCT = 0x02,
+ GSM48_RR_CAUSE_ABNORMAL_TIMER = 0x03,
+ GSM48_RR_CAUSE_ABNORMAL_NOACT = 0x04,
+ GSM48_RR_CAUSE_PREMPTIVE_REL = 0x05,
+ GSM48_RR_CAUSE_HNDOVER_IMP = 0x06,
+ GSM48_RR_CAUSE_CHAN_MODE_UNACCT = 0x07,
+ GSM48_RR_CAUSE_FREQ_NOT_IMPL = 0x08,
+ GSM48_RR_CAUSE_CALL_ClEARED = 0x41,
+ GSM48_RR_CAUSE_SEMANT_INCORR = 0x5f,
+ GSM48_RR_CAUSE_INVALID_MAND_INF = 0x60,
+ GSM48_RR_CAUSE_MSG_TYPE_N = 0x61,
+ GSM48_RR_CAUSE_MSG_TYPE_N_COMPAT= 0x62,
+ GSM48_RR_CAUSE_COND_IE_ERROR = 0x64,
+ GSM48_RR_CAUSE_NO_CELL_ALLOC_A = 0x65,
+ GSM48_RR_CAUSE_PROT_ERROR_UNSPC = 0x6f,
+};
+
/* Annex G, GSM specific cause values for mobility management */
enum gsm48_reject_value {
GSM48_REJECT_IMSI_UNKNOWN_IN_HLR = 2,
@@ -429,5 +450,6 @@
int gsm48_sendmsg(struct msgb *msg);
int generate_mid_from_tmsi(u_int8_t *buf, u_int32_t tmsi);
+int gsm48_send_rr_release(struct gsm_lchan *lchan);
#endif