226 lines
6.7 KiB
C
226 lines
6.7 KiB
C
#ifndef TRX_SCHEDULER_H
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#define TRX_SCHEDULER_H
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#include <osmocom/core/utils.h>
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#include <osmo-bts/gsm_data.h>
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/* These types define the different channels on a multiframe.
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* Each channel has queues and can be activated individually.
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*/
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enum trx_chan_type {
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TRXC_IDLE = 0,
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TRXC_FCCH,
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TRXC_SCH,
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TRXC_BCCH,
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TRXC_RACH,
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TRXC_CCCH,
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TRXC_TCHF,
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TRXC_TCHH_0,
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TRXC_TCHH_1,
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TRXC_SDCCH4_0,
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TRXC_SDCCH4_1,
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TRXC_SDCCH4_2,
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TRXC_SDCCH4_3,
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TRXC_SDCCH8_0,
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TRXC_SDCCH8_1,
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TRXC_SDCCH8_2,
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TRXC_SDCCH8_3,
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TRXC_SDCCH8_4,
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TRXC_SDCCH8_5,
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TRXC_SDCCH8_6,
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TRXC_SDCCH8_7,
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TRXC_SACCHTF,
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TRXC_SACCHTH_0,
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TRXC_SACCHTH_1,
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TRXC_SACCH4_0,
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TRXC_SACCH4_1,
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TRXC_SACCH4_2,
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TRXC_SACCH4_3,
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TRXC_SACCH8_0,
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TRXC_SACCH8_1,
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TRXC_SACCH8_2,
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TRXC_SACCH8_3,
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TRXC_SACCH8_4,
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TRXC_SACCH8_5,
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TRXC_SACCH8_6,
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TRXC_SACCH8_7,
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TRXC_PDTCH,
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TRXC_PTCCH,
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TRXC_CBCH,
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_TRX_CHAN_MAX
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};
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extern const struct value_string trx_chan_type_names[];
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#define GSM_BURST_LEN 148
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#define GPRS_BURST_LEN GSM_BURST_LEN
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#define EGPRS_BURST_LEN 444
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enum trx_burst_type {
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TRX_BURST_GMSK,
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TRX_BURST_8PSK,
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};
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/* States each channel on a multiframe */
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struct l1sched_chan_state {
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/* scheduler */
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uint8_t active; /* Channel is active */
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ubit_t *dl_bursts; /* burst buffer for TX */
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enum trx_burst_type dl_burst_type; /* GMSK or 8PSK burst type */
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sbit_t *ul_bursts; /* burst buffer for RX */
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uint32_t ul_first_fn; /* fn of first burst */
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uint8_t ul_mask; /* mask of received bursts */
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/* RSSI / TOA */
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uint8_t rssi_num; /* number of RSSI values */
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float rssi_sum; /* sum of RSSI values */
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uint8_t toa_num; /* number of TOA values */
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int32_t toa256_sum; /* sum of TOA values (1/256 symbol) */
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/* loss detection */
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uint8_t lost_frames; /* how many L2 frames were lost */
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/* mode */
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uint8_t rsl_cmode, tch_mode; /* mode for TCH channels */
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/* AMR */
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uint8_t codec[4]; /* 4 possible codecs for amr */
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int codecs; /* number of possible codecs */
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float ber_sum; /* sum of bit error rates */
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int ber_num; /* number of bit error rates */
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uint8_t ul_ft; /* current uplink FT index */
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uint8_t dl_ft; /* current downlink FT index */
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uint8_t ul_cmr; /* current uplink CMR index */
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uint8_t dl_cmr; /* current downlink CMR index */
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uint8_t amr_loop; /* if AMR loop is enabled */
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/* TCH/H */
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uint8_t dl_ongoing_facch; /* FACCH/H on downlink */
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uint8_t ul_ongoing_facch; /* FACCH/H on uplink */
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/* encryption */
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int ul_encr_algo; /* A5/x encry algo downlink */
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int dl_encr_algo; /* A5/x encry algo uplink */
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int ul_encr_key_len;
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int dl_encr_key_len;
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uint8_t ul_encr_key[MAX_A5_KEY_LEN];
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uint8_t dl_encr_key[MAX_A5_KEY_LEN];
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/* measurements */
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struct {
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uint8_t clock; /* cyclic clock counter */
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int8_t rssi[32]; /* last RSSI values */
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int rssi_count; /* received RSSI values */
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int rssi_valid_count; /* number of stored value */
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int rssi_got_burst; /* any burst received so far */
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int32_t toa256_sum; /* sum of TOA values (1/256 symbol) */
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int toa_num; /* number of TOA value */
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} meas;
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/* handover */
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uint8_t ho_rach_detect; /* if rach detection is on */
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};
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struct l1sched_ts {
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uint8_t mf_index; /* selected multiframe index */
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uint32_t mf_last_fn; /* last received frame number */
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uint8_t mf_period; /* period of multiframe */
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const struct trx_sched_frame *mf_frames; /* pointer to frame layout */
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struct llist_head dl_prims; /* Queue primitives for TX */
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/* Channel states for all logical channels */
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struct l1sched_chan_state chan_state[_TRX_CHAN_MAX];
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};
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struct l1sched_trx {
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struct gsm_bts_trx *trx;
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struct l1sched_ts ts[TRX_NR_TS];
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};
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struct l1sched_ts *l1sched_trx_get_ts(struct l1sched_trx *l1t, uint8_t tn);
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/*! \brief how many frame numbers in advance we should send bursts to PHY */
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extern uint32_t trx_clock_advance;
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/*! \brief advance RTS.ind to L2 by that many clocks */
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extern uint32_t trx_rts_advance;
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/*! \brief last frame number as received from PHY */
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extern uint32_t transceiver_last_fn;
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/*! \brief Initialize the scheduler data structures */
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int trx_sched_init(struct l1sched_trx *l1t, struct gsm_bts_trx *trx);
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/*! \brief De-initialize the scheduler data structures */
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void trx_sched_exit(struct l1sched_trx *l1t);
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/*! \brief Handle a PH-DATA.req from L2 down to L1 */
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int trx_sched_ph_data_req(struct l1sched_trx *l1t, struct osmo_phsap_prim *l1sap);
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/*! \brief Handle a PH-TCH.req from L2 down to L1 */
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int trx_sched_tch_req(struct l1sched_trx *l1t, struct osmo_phsap_prim *l1sap);
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/*! \brief PHY informs us of new (current) GSM frame number */
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int trx_sched_clock(struct gsm_bts *bts, uint32_t fn);
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/*! \brief handle an UL burst received by PHY */
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int trx_sched_ul_burst(struct l1sched_trx *l1t, uint8_t tn, uint32_t fn,
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sbit_t *bits, uint16_t nbits, int8_t rssi, int16_t toa);
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/*! \brief set multiframe scheduler to given physical channel config */
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int trx_sched_set_pchan(struct l1sched_trx *l1t, uint8_t tn,
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enum gsm_phys_chan_config pchan);
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/*! \brief set all matching logical channels active/inactive */
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int trx_sched_set_lchan(struct l1sched_trx *l1t, uint8_t chan_nr, uint8_t link_id,
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int active);
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/*! \brief set mode of all matching logical channels to given mode(s) */
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int trx_sched_set_mode(struct l1sched_trx *l1t, uint8_t chan_nr, uint8_t rsl_cmode,
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uint8_t tch_mode, int codecs, uint8_t codec0, uint8_t codec1,
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uint8_t codec2, uint8_t codec3, uint8_t initial_codec,
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uint8_t handover);
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/*! \brief set ciphering on given logical channels */
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int trx_sched_set_cipher(struct l1sched_trx *l1t, uint8_t chan_nr, int downlink,
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int algo, uint8_t *key, int key_len);
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/* \brief close all logical channels and reset timeslots */
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void trx_sched_reset(struct l1sched_trx *l1t);
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/* frame structures */
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struct trx_sched_frame {
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/*! \brief downlink TRX channel type */
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enum trx_chan_type dl_chan;
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/*! \brief downlink block ID */
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uint8_t dl_bid;
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/*! \brief uplink TRX channel type */
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enum trx_chan_type ul_chan;
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/*! \brief uplink block ID */
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uint8_t ul_bid;
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};
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/* multiframe structure */
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struct trx_sched_multiframe {
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/*! \brief physical channel config (channel combination) */
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enum gsm_phys_chan_config pchan;
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/*! \brief applies to which timeslots? */
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uint8_t slotmask;
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/*! \brief repeats how many frames */
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uint8_t period;
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/*! \brief pointer to scheduling structure */
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const struct trx_sched_frame *frames;
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/*! \brief human-readable name */
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const char *name;
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};
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int find_sched_mframe_idx(enum gsm_phys_chan_config pchan, uint8_t tn);
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/*! Determine if given frame number contains SACCH (true) or other (false) burst */
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bool trx_sched_is_sacch_fn(struct gsm_bts_trx_ts *ts, uint32_t fn, bool uplink);
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extern const struct trx_sched_multiframe trx_sched_multiframes[];
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#endif /* TRX_SCHEDULER_H */
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