diff options
| author | Andreas Eversberg <jolly@eversberg.eu> | 2013-05-13 16:45:21 +0200 |
|---|---|---|
| committer | Andreas Eversberg <jolly@eversberg.eu> | 2013-05-13 16:45:21 +0200 |
| commit | a004e6a8233695abd417a97d6f81a802b605038a (patch) | |
| tree | 226ca73caa945b447f2c8fcd7be242a7f9b4f671 /src/gprs_rlcmac.h | |
| parent | 783aa4bcb8aab7fbcd1b91ad225018a06e950f50 (diff) | |
Added timing advance support for up and downlink TBFs
The timing advance of any TBF is stored when it ends. Whenever a new TBF
with the same TLLI is created (downlink TBF), the stored TA is recalled.
This algorithm assumes that the mobile does not move too fast during
transfer. Also the mobile must start a connection in order to get correct
initial timing advance.
This algorithm does not implement the timing advance procedure as defined
in TS 04.60. To implement the standard timing advance procedure, the BTS
must decode RACH on certain bursts, the mobile is expected to send them.
This requires much more complexity to a transceiver like USRP/UmTRX or
Calypso BTS.
The algorithm was tested at TA >= 8 and works quite well.
Diffstat (limited to 'src/gprs_rlcmac.h')
| -rw-r--r-- | src/gprs_rlcmac.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h index 5badb120..c5af6029 100644 --- a/src/gprs_rlcmac.h +++ b/src/gprs_rlcmac.h @@ -374,6 +374,8 @@ void tbf_timer_cb(void *_tbf); int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf); +int gprs_rlcmac_sba_timeout(struct gprs_rlcmac_sba *sba); + int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta); int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint8_t trx, uint8_t ts, @@ -421,6 +423,12 @@ struct gprs_rlcmac_paging *gprs_rlcmac_dequeue_paging( struct msgb *gprs_rlcmac_send_packet_paging_request( struct gprs_rlcmac_pdch *pdch); +int remember_timing_advance(uint32_t tlli, uint8_t ta); + +int recall_timing_advance(uint32_t tlli); + +int flush_timing_advance(void); + extern "C" { #endif int alloc_algorithm_a(struct gprs_rlcmac_tbf *old_tbf, |