libosmogsm  1.8.0.79-b394d
Osmocom GSM library
gsm0502.h
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1 
3 #pragma once
4 
5 #include <stdint.h>
6 
9 
10 /* 4.3.3 TDMA frame number : constants and modular arithmetic */
11 #define GSM_TDMA_FN_DURATION_nS 4615384 /* in 1e−9 seconds (approx) */
12 #define GSM_TDMA_FN_DURATION_uS 4615 /* in 1e-6 seconds (approx) */
13 
14 #define GSM_TDMA_SUPERFRAME (26 * 51)
15 #define GSM_TDMA_HYPERFRAME (2048 * GSM_TDMA_SUPERFRAME)
16 
18 #define GSM_TDMA_FN_SUM(a, b) \
19  (((a) + (b)) % GSM_TDMA_HYPERFRAME)
21 #define GSM_TDMA_FN_SUB(a, b) \
22  (((a) + GSM_TDMA_HYPERFRAME - (b)) % GSM_TDMA_HYPERFRAME)
24 #define GSM_TDMA_FN_DIFF(a, b) \
25  OSMO_MIN(GSM_TDMA_FN_SUB(a, b), GSM_TDMA_FN_SUB(b, a))
26 
28 #define GSM_TDMA_FN_INC(fn) \
29  ((fn) = GSM_TDMA_FN_SUM((fn), 1))
31 #define GSM_TDMA_FN_DEC(fn) \
32  ((fn) = GSM_TDMA_FN_SUB((fn), 1))
33 
34 /* 5.2.3.1 Normal burst for GMSK (1 bit per symbol) */
35 #define GSM_NBITS_NB_GMSK_TAIL 3
36 #define GSM_NBITS_NB_GMSK_PAYLOAD (2 * 58)
37 #define GSM_NBITS_NB_GMSK_TRAIN_SEQ 26
38 #define GSM_NBITS_NB_GMSK_BURST 148 /* without guard period */
39 
40 /* 5.2.3.3 Normal burst for 8-PSK (3 bits per symbol) */
41 #define GSM_NBITS_NB_8PSK_TAIL (GSM_NBITS_NB_GMSK_TAIL * 3)
42 #define GSM_NBITS_NB_8PSK_PAYLOAD (GSM_NBITS_NB_GMSK_PAYLOAD * 3)
43 #define GSM_NBITS_NB_8PSK_TRAIN_SEQ (GSM_NBITS_NB_GMSK_TRAIN_SEQ * 3)
44 #define GSM_NBITS_NB_8PSK_BURST (GSM_NBITS_NB_GMSK_BURST * 3)
45 
46 /* 5.2.5 Synchronization burst (also GMSK) */
47 #define GSM_NBITS_SB_GMSK_TAIL GSM_NBITS_NB_GMSK_TAIL
48 #define GSM_NBITS_SB_GMSK_PAYLOAD (2 * 39)
49 #define GSM_NBITS_SB_GMSK_ETRAIN_SEQ 64
50 #define GSM_NBITS_SB_GMSK_BURST GSM_NBITS_NB_GMSK_BURST
51 
52 /* 5.2.6 Dummy burst (also GMSK) */
53 #define GSM_NBITS_DB_GMSK_TAIL GSM_NBITS_NB_GMSK_TAIL
54 #define GSM_NBITS_DB_GMSK_MIXED 142
55 #define GSM_NBITS_DB_GMSK_BURST GSM_NBITS_NB_GMSK_BURST
56 
57 /* 5.2.7 Access burst (also GMSK) */
58 #define GSM_NBITS_AB_GMSK_ETAIL 8
59 #define GSM_NBITS_AB_GMSK_SYNCH_SEQ 41
60 #define GSM_NBITS_AB_GMSK_PAYLOAD 36
61 #define GSM_NBITS_AB_GMSK_TAIL GSM_NBITS_NB_GMSK_TAIL
62 #define GSM_NBITS_AB_GMSK_BURST GSM_NBITS_NB_GMSK_BURST
63 
64 /* Table 5 Clause 7 TS 05.02 */
65 static inline unsigned int
67 {
68  if (chan_desc->ccch_conf == RSL_BCCH_CCCH_CONF_1_C)
69  return 3 - chan_desc->bs_ag_blks_res;
70  else
71  return 9 - chan_desc->bs_ag_blks_res;
72 }
73 
74 /* Chapter 6.5.2 of TS 05.02 */
75 static inline unsigned int
76 gsm0502_get_ccch_group(uint64_t imsi, unsigned int bs_cc_chans,
77  unsigned int n_pag_blocks)
78 {
79  return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) / n_pag_blocks;
80 }
81 
82 /* Chapter 6.5.2 of TS 05.02 */
83 static inline unsigned int
84 gsm0502_get_paging_group(uint64_t imsi, unsigned int bs_cc_chans,
85  int n_pag_blocks)
86 {
87  return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) % n_pag_blocks;
88 }
89 
90 unsigned int
92 
101 };
102 
103 uint32_t gsm0502_fn_remap(uint32_t fn, enum gsm0502_fn_remap_channel channel);
104 
105 uint16_t gsm0502_hop_seq_gen(const struct gsm_time *t,
106  uint8_t hsn, uint8_t maio,
107  size_t n, const uint16_t *ma);
write Write running configuration to or terminal n Write configuration to the copy running config startup Copy configuration n Copy running config to n Copy running config to startup write Write running configuration to or terminal n Write to terminal n
#define RSL_BCCH_CCCH_CONF_1_C
Definition: gsm_08_58.h:705
static unsigned int gsm0502_get_ccch_group(uint64_t imsi, unsigned int bs_cc_chans, unsigned int n_pag_blocks)
Definition: gsm0502.h:76
uint32_t gsm0502_fn_remap(uint32_t fn, enum gsm0502_fn_remap_channel channel)
Calculate the frame number of the beginning of a block.
Definition: gsm0502.c:177
static unsigned int gsm0502_get_paging_group(uint64_t imsi, unsigned int bs_cc_chans, int n_pag_blocks)
Definition: gsm0502.h:84
uint16_t gsm0502_hop_seq_gen(const struct gsm_time *t, uint8_t hsn, uint8_t maio, size_t n, const uint16_t *ma)
Hopping sequence generation as per 3GPP TS 45.002, section 6.2.3.
Definition: gsm0502.c:230
static unsigned int gsm0502_get_n_pag_blocks(const struct gsm48_control_channel_descr *chan_desc)
Definition: gsm0502.h:66
unsigned int gsm0502_calc_paging_group(const struct gsm48_control_channel_descr *chan_desc, uint64_t imsi)
Definition: gsm0502.c:37
gsm0502_fn_remap_channel
Definition: gsm0502.h:93
@ FN_REMAP_TCH_H0
Definition: gsm0502.h:95
@ FN_REMAP_TCH_H1
Definition: gsm0502.h:96
@ FN_REMAP_MAX
Definition: gsm0502.h:100
@ FN_REMAP_FACCH_F
Definition: gsm0502.h:97
@ FN_REMAP_FACCH_H1
Definition: gsm0502.h:99
@ FN_REMAP_TCH_F
Definition: gsm0502.h:94
@ FN_REMAP_FACCH_H0
Definition: gsm0502.h:98
GSM TS 04.08 definitions.
struct gsm48_chan_desc chan_desc
Definition: gsm_04_08.h:0
GSM Radio Signalling Link messages on the A-bis interface.
Definition: gsm_04_08.h:938
Definition: gsm_utils.h:41