diff options
| author | Pau Espin Pedrol <pespin@sysmocom.de> | 2021-09-20 11:20:09 +0200 |
|---|---|---|
| committer | Pau Espin Pedrol <pespin@sysmocom.de> | 2021-09-20 11:22:32 +0200 |
| commit | eeae77634560de084767dfc651a0a14f5d7d95a8 (patch) | |
| tree | b7ed39a730ab2335f09122cccd6e5d4bcbfc259a | |
| parent | 0e3083daf597cb34e12693f7ed9bcc006406f085 (diff) | |
PTCCH: skip Tx DL idle blocks when possible
Same was already done for PDTCH in previous commits. Let's now apply
same bits to PTCCH.
Related: SYS#4919
Change-Id: If6617964e67fc35eeee1791b06e13bf63ac88f73
| -rw-r--r-- | src/pcu_l1_if.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp index 25c19333..1600da03 100644 --- a/src/pcu_l1_if.cpp +++ b/src/pcu_l1_if.cpp @@ -531,6 +531,22 @@ int pcu_rx_rts_req_ptcch(struct gprs_rlcmac_bts *bts, uint8_t trx, uint8_t ts, if (!pdch->m_is_enabled) return -EAGAIN; + /* If there's no TBF attached to this PDCH, we can skip Tx of PTCCH + * since there's nothing worthy of being transmitted. This way BTS can + * identify idle blocks and send nothing or dumy blocks with reduced + * energy for the sake of energy saving. + */ + const unsigned num_tbfs = pdch->num_tbfs(GPRS_RLCMAC_DL_TBF) + + pdch->num_tbfs(GPRS_RLCMAC_UL_TBF); + bool skip_idle = (num_tbfs == 0); +#ifdef ENABLE_DIRECT_PHY + /* In DIRECT_PHY mode we want to always submit something to L1 in + * TRX0, since BTS is not preparing dummy bursts on idle TS for us: */ + skip_idle = skip_idle && trx != 0; +#endif + if (skip_idle) + return 0; + pcu_l1if_tx_ptcch(bts, trx, ts, bts->trx[trx].arfcn, fn, block_nr, pdch->ptcch_msg, GSM_MACBLOCK_LEN); return 0; |