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[handover] Introduce new handover related LCHAN signals 

This introduces the signals S_LCHAN_ACTIVATE_{ACK,NACK} and
S_LCAN_HANDOVER_{FAIL,COMPL,DETECT} as well as code that actually issues
those signals.  The signals are relevant for a yet-to-be-written handover
control logic.
This commit is contained in:
Harald Welte 2009-11-29 22:45:52 +01:00
parent 8c83af65c1
commit d011e8b958
3 changed files with 63 additions and 5 deletions
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5
openbsc/include/openbsc/signal.h
View File

@ -78,6 +78,11 @@ enum signal_lchan {
* signal handler.
*/
S_LCHAN_UNEXPECTED_RELEASE,
S_LCHAN_ACTIVATE_ACK, /* 08.58 Channel Activate ACK */
S_LCHAN_ACTIVATE_NACK, /* 08.58 Channel Activate NACK */
S_LCHAN_HANDOVER_COMPL, /* 04.08 Handover Completed */
S_LCHAN_HANDOVER_FAIL, /* 04.08 Handover Failed */
S_LCHAN_HANDOVER_DETECT, /* 08.58 Handover Detect */
};
/* SS_SUBSCR signals */

30
openbsc/src/abis_rsl.c
View File

@ -907,7 +907,9 @@ static int rsl_rx_chan_act_ack(struct msgb *msg)
* to assign the activated channel to the MS */
if (rslh->ie_chan != RSL_IE_CHAN_NR)
return -EINVAL;
dispatch_signal(SS_LCHAN, S_LCHAN_ACTIVATE_ACK, msg->lchan);
return 0;
}
@ -926,6 +928,8 @@ static int rsl_rx_chan_act_nack(struct msgb *msg)
print_rsl_cause(TLVP_VAL(&tp, RSL_IE_CAUSE),
TLVP_LEN(&tp, RSL_IE_CAUSE));
dispatch_signal(SS_LCHAN, S_LCHAN_ACTIVATE_NACK, msg->lchan);
lchan_free(msg->lchan);
return 0;
}
@ -1050,6 +1054,27 @@ static int rsl_rx_meas_res(struct msgb *msg)
return 0;
}
/* Chapter 8.4.7 */
static int rsl_rx_hando_det(struct msgb *msg)
{
struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
struct tlv_parsed tp;
DEBUGP(DRSL, "HANDOVER DETECT ");
rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh));
if (TLVP_PRESENT(&tp, RSL_IE_ACCESS_DELAY))
DEBUGPC(DRSL, "access delay = %u\n",
*TLVP_VAL(&tp, RSL_IE_ACCESS_DELAY));
else
DEBUGPC(DRSL, "\n");
dispatch_signal(SS_LCHAN, S_LCHAN_HANDOVER_DETECT, msg->lchan);
return 0;
}
static int abis_rsl_rx_dchan(struct msgb *msg)
{
struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg);
@ -1077,6 +1102,9 @@ static int abis_rsl_rx_dchan(struct msgb *msg)
case RSL_MT_MEAS_RES:
rc = rsl_rx_meas_res(msg);
break;
case RSL_MT_HANDO_DET:
rc = rsl_rx_hando_det(msg);
break;
case RSL_MT_RF_CHAN_REL_ACK:
DEBUGPC(DRSL, "RF CHANNEL RELEASE ACK\n");
lchan_free(msg->lchan);

33
openbsc/src/gsm_04_08.c
View File

@ -1563,6 +1563,33 @@ static int gsm48_rx_rr_app_info(struct msgb *msg)
return db_apdu_blob_store(msg->lchan->subscr, apdu_id_flags, apdu_len, apdu_data);
}
/* Chapter 9.1.16 Handover complete */
static gsm48_rx_rr_ho_compl(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
DEBUGP(DRR, "HANDOVER COMPLETE cause = %s\n",
rr_cause_name(gh->data[0]));
dispatch_signal(SS_LCHAN, S_LCHAN_HANDOVER_COMPL, msg->lchan);
/* FIXME: release old channel */
return 0;
}
/* Chapter 9.1.17 Handover Failure */
static gsm48_rx_rr_ho_fail(struct msgb *msg)
{
struct gsm48_hdr *gh = msgb_l3(msg);
DEBUGP(DRR, "HANDOVER FAILED cause = %s\n",
rr_cause_name(gh->data[0]));
dispatch_signal(SS_LCHAN, S_LCHAN_HANDOVER_FAIL, msg->lchan);
/* FIXME: release allocated new channel */
return 0;
}
/* Receive a GSM 04.08 Radio Resource (RR) message */
static int gsm0408_rcv_rr(struct msgb *msg)
@ -1597,12 +1624,10 @@ static int gsm0408_rcv_rr(struct msgb *msg)
/* FIXME: check for MI (if any) */
break;
case GSM48_MT_RR_HANDO_COMPL:
DEBUGP(DRR, "HANDOVER COMPLETE\n");
/* FIXME: release old channel */
rc = gsm48_rx_rr_ho_compl(msg);
break;
case GSM48_MT_RR_HANDO_FAIL:
DEBUGP(DRR, "HANDOVER FAILED\n");
/* FIXME: release allocated new channel */
rc = gsm48_rx_rr_ho_fail(msg);
break;
default:
fprintf(stderr, "Unimplemented GSM 04.08 RR msg type 0x%02x\n",