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[gsm48] Add generation of ASSIGNMENT COMMAND to the 0408 utils 

Add code to generate an assignment command for a given lchan. It
is expected that the lchan is modified already and the mode will
be picked up from their. Currently only the mandantory items
are supported.
This commit is contained in:
Holger Hans Peter Freyther 2009-10-22 11:47:45 +02:00
parent 2e021c6671
commit 942ff1737a
3 changed files with 43 additions and 0 deletions
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10
openbsc/include/openbsc/gsm_04_08.h
View File

@ -59,6 +59,15 @@ enum gsm48_chan_mode {
GSM48_CMODE_DATA_3k6 = 0x23,
};
/* Chapter 9.1.2 */
struct gsm48_ass_cmd {
/* Semantic is from 10.5.2.5a */
struct gsm48_chan_desc chan_desc;
u_int8_t power_command;
u_int8_t data[0];
} __attribute__((packed));
/* Chapter 9.1.18 */
struct gsm48_imm_ass {
u_int8_t l2_plen;
@ -727,6 +736,7 @@ int gsm48_send_rr_release(struct gsm_lchan *lchan);
int gsm48_send_rr_ciph_mode(struct gsm_lchan *lchan, int want_imeisv);
int gsm48_send_rr_app_info(struct gsm_lchan *lchan, u_int8_t apdu_id,
u_int8_t apdu_len, const u_int8_t *apdu);
int gsm48_send_rr_ass_cmd(struct gsm_lchan *lchan, u_int8_t power_class);
int bsc_upqueue(struct gsm_network *net);

1
openbsc/src/abis_rsl.c
View File

@ -239,6 +239,7 @@ struct gsm_lchan *lchan_lookup(struct gsm_bts_trx *trx, u_int8_t chan_nr)
return lchan;
}
/* See Table 10.5.25 of GSM04.08 */
u_int8_t lchan2chan_nr(struct gsm_lchan *lchan)
{
struct gsm_bts_trx_ts *ts = lchan->ts;

32
openbsc/src/gsm_04_08_utils.c
View File

@ -482,3 +482,35 @@ int gsm48_send_rr_ciph_mode(struct gsm_lchan *lchan, int want_imeisv)
return rsl_encryption_cmd(msg);
}
/* Chapter 9.1.2: Assignment Command */
int gsm48_send_rr_ass_cmd(struct gsm_lchan *lchan, u_int8_t power_command)
{
struct msgb *msg = gsm48_msgb_alloc();
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
struct gsm48_ass_cmd *ass =
(struct gsm48_ass_cmd *) msgb_put(msg, sizeof(*ass));
u_int16_t arfcn = lchan->ts->trx->arfcn & 0x3ff;
DEBUGP(DRR, "-> ASSIGNMENT COMMAND tch_mode=0x%02x\n", lchan->tch_mode);
msg->lchan = lchan;
gh->proto_discr = GSM48_PDISC_RR;
gh->msg_type = GSM48_MT_RR_ASS_CMD;
/*
* fill the channel information element, this code
* should probably be shared with rsl_rx_chan_rqd(),
* gsm48_tx_chan_mode_modify. But beware that 10.5.2.5
* 10.5.2.5.a have slightly different semantic for
* the chan_desc. But as long as multi-slot configurations
* are not used we seem to be fine.
*/
ass->chan_desc.chan_nr = lchan2chan_nr(lchan);
ass->chan_desc.h0.tsc = lchan->ts->trx->bts->tsc;
ass->chan_desc.h0.h = 0;
ass->chan_desc.h0.arfcn_high = arfcn >> 8;
ass->chan_desc.h0.arfcn_low = arfcn & 0xff;
ass->power_command = power_command;
return gsm48_sendmsg(msg, NULL);
}