Neels Hofmeyr | 17518fe | 2017-06-20 04:35:06 +0200 | [diff] [blame] | 1 | /*! \file gsm0502.h */ |
| 2 | |
Sylvain Munaut | 12ba778 | 2014-06-16 10:13:40 +0200 | [diff] [blame] | 3 | #pragma once |
Harald Welte | 94df39e | 2011-06-26 14:33:57 +0200 | [diff] [blame] | 4 | |
| 5 | #include <stdint.h> |
| 6 | |
| 7 | #include <osmocom/gsm/protocol/gsm_04_08.h> |
| 8 | #include <osmocom/gsm/protocol/gsm_08_58.h> |
| 9 | |
Vadim Yanitskiy | ed0445b | 2020-06-17 03:55:46 +0700 | [diff] [blame] | 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 | |
| 17 | /*! Return the sum of two specified TDMA frame numbers (summation) */ |
| 18 | #define GSM_TDMA_FN_SUM(a, b) \ |
| 19 | ((a + b) % GSM_TDMA_HYPERFRAME) |
| 20 | /*! Return the difference of two specified TDMA frame numbers (subtraction) */ |
| 21 | #define GSM_TDMA_FN_SUB(a, b) \ |
| 22 | ((a + GSM_TDMA_HYPERFRAME - b) % GSM_TDMA_HYPERFRAME) |
| 23 | /*! Return the *minimum* difference of two specified TDMA frame numbers (distance) */ |
| 24 | #define GSM_TDMA_FN_DIFF(a, b) \ |
| 25 | OSMO_MIN(GSM_TDMA_FN_SUB(a, b), GSM_TDMA_FN_SUB(b, a)) |
| 26 | |
| 27 | /*! Increment the given TDMA frame number by 1 and return the result (like ++fn) */ |
| 28 | #define GSM_TDMA_FN_INC(fn) \ |
| 29 | ((fn) = GSM_TDMA_FN_SUM((fn), 1)) |
| 30 | /*! Decrement the given TDMA frame number by 1 and return the result (like --fn) */ |
| 31 | #define GSM_TDMA_FN_DEC(fn) \ |
| 32 | ((fn) = GSM_TDMA_FN_SUB((fn), 1)) |
| 33 | |
Harald Welte | 94df39e | 2011-06-26 14:33:57 +0200 | [diff] [blame] | 34 | /* Table 5 Clause 7 TS 05.02 */ |
| 35 | static inline unsigned int |
| 36 | gsm0502_get_n_pag_blocks(struct gsm48_control_channel_descr *chan_desc) |
| 37 | { |
| 38 | if (chan_desc->ccch_conf == RSL_BCCH_CCCH_CONF_1_C) |
| 39 | return 3 - chan_desc->bs_ag_blks_res; |
| 40 | else |
| 41 | return 9 - chan_desc->bs_ag_blks_res; |
| 42 | } |
| 43 | |
| 44 | /* Chapter 6.5.2 of TS 05.02 */ |
| 45 | static inline unsigned int |
| 46 | gsm0502_get_ccch_group(uint64_t imsi, unsigned int bs_cc_chans, |
| 47 | unsigned int n_pag_blocks) |
| 48 | { |
| 49 | return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) / n_pag_blocks; |
| 50 | } |
| 51 | |
| 52 | /* Chapter 6.5.2 of TS 05.02 */ |
| 53 | static inline unsigned int |
| 54 | gsm0502_get_paging_group(uint64_t imsi, unsigned int bs_cc_chans, |
| 55 | int n_pag_blocks) |
| 56 | { |
| 57 | return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) % n_pag_blocks; |
| 58 | } |
| 59 | |
Harald Welte | ea19c97 | 2011-06-26 14:47:16 +0200 | [diff] [blame] | 60 | unsigned int |
| 61 | gsm0502_calc_paging_group(struct gsm48_control_channel_descr *chan_desc, uint64_t imsi); |
Philipp Maier | 69e00cc | 2019-10-09 13:38:38 +0200 | [diff] [blame] | 62 | |
| 63 | enum gsm0502_fn_remap_channel { |
| 64 | FN_REMAP_TCH_F, |
| 65 | FN_REMAP_TCH_H0, |
| 66 | FN_REMAP_TCH_H1, |
| 67 | FN_REMAP_FACCH_F, |
| 68 | FN_REMAP_FACCH_H0, |
| 69 | FN_REMAP_FACCH_H1, |
| 70 | FN_REMAP_MAX, |
| 71 | }; |
| 72 | |
| 73 | uint32_t gsm0502_fn_remap(uint32_t fn, enum gsm0502_fn_remap_channel channel); |
Sylvain Munaut | 63bee45 | 2020-05-14 03:02:26 +0700 | [diff] [blame] | 74 | |
| 75 | uint16_t gsm0502_hop_seq_gen(const struct gsm_time *t, |
| 76 | uint8_t hsn, uint8_t maio, |
| 77 | size_t n, const uint16_t *ma); |