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GPRS: Add Support for the GPRS Cell Option Extension Info IE 

Extension Information is part of the GPRS Cell Options IE, as
specified in Chapter 12.24 of TS 04.60.  It is needed for
indicating EDGE capabilities of the BTS to the MS.

This simply adds the code to encode this IE as part of SI13,
but does not actually use the code yet.
This commit is contained in:
Harald Welte 2010-04-18 14:49:05 +02:00
parent 2c57232489
commit da0586a838
3 changed files with 46 additions and 2 deletions
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11
openbsc/include/openbsc/rest_octets.h
View File

@ -71,6 +71,7 @@ enum gprs_nmo {
GPRS_NMO_III = 2, /* no paging coordination */
};
/* TS 04.60 12.24 */
struct gprs_cell_options {
enum gprs_nmo nmo;
/* T3168: wait for packet uplink assignment message */
@ -79,6 +80,16 @@ struct gprs_cell_options {
u_int32_t t3192; /* in milliseconds */
u_int32_t drx_timer_max;/* in seconds */
u_int32_t bs_cv_max;
u_int8_t ext_info_present;
struct {
u_int8_t egprs_supported;
u_int8_t use_egprs_p_ch_req;
u_int8_t bep_period;
u_int8_t pfc_supported;
u_int8_t dtm_supported;
u_int8_t bss_paging_coordination;
} ext_info;
};
/* TS 04.60 Table 12.9.2 */

27
openbsc/src/rest_octets.c
View File

@ -319,8 +319,31 @@ static int append_gprs_cell_opt(struct bitvec *bv,
/* hard-code no PAN_{DEC,INC,MAX} */
bitvec_set_bit(bv, 0);
/* no extension information (EDGE) */
bitvec_set_bit(bv, 0);
if (!gco->ext_info_present) {
/* no extension information */
bitvec_set_bit(bv, 0);
} else {
/* extension information */
bitvec_set_bit(bv, 1);
if (!gco->ext_info.egprs_supported) {
/* 6bit length of extension */
bitvec_set_uint(bv, 1 + 3, 6);
/* EGPRS supported in the cell */
bitvec_set_bit(bv, 0);
} else {
/* 6bit length of extension */
bitvec_set_uint(bv, 1 + 5 + 3, 6);
/* EGPRS supported in the cell */
bitvec_set_bit(bv, 1);
/* 1bit EGPRS PACKET CHANNEL REQUEST */
bitvec_set_bit(bv, gco->ext_info.use_egprs_p_ch_req);
/* 4bit BEP PERIOD */
bitvec_set_uint(bv, gco->ext_info.bep_period, 4);
}
bitvec_set_bit(bv, gco->ext_info.pfc_supported);
bitvec_set_bit(bv, gco->ext_info.dtm_supported);
bitvec_set_bit(bv, gco->ext_info.bss_paging_coordination);
}
return 0;
}

10
openbsc/src/system_information.c
View File

@ -402,6 +402,16 @@ static struct gsm48_si13_info si13_default = {
.t3192 = 500,
.drx_timer_max = 3,
.bs_cv_max = 15,
.ext_info_present = 0,
.ext_info = {
/* The values below are just guesses ! */
.egprs_supported = 1,
.use_egprs_p_ch_req = 1,
.bep_period = 4,
.pfc_supported = 0,
.dtm_supported = 0,
.bss_paging_coordination = 0,
},
},
.pwr_ctrl_pars = {
.alpha = 10, /* a = 1.0 */