srsRAN_4G
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srsran
srsUE LTE TDD BUG
Issue Description
[Describe the issue in detail] srsUe connect CMU500 in TDD earfcn, RA fail ue: srsUE, version:srsRAN-release_19_12, usrpX310 enb/epc: cmu500
Setup Details
[Specify details of the test setup. This would help us reproduce the problem reliably] RA fail, ue send RA.msg3, but cmu500 not recieved
Expected Behavior
[What you expect to happen] RA success, attach success
Actual Behaviour
[What happens instead e.g. error message]
Steps to reproduce the problem
[Tell us how to reproduce this issue e.g. RF setup, application config files]
Additional Information
[Any additional information, configuration or data that might be necessary to reproduce the issue]
BUG repair:
file: srsue/src/phy/sync.cc
function: set_time_adv_sec
void sync::set_time_adv_sec(float time_adv_sec)
{
// If transmitting earlier, transmit less samples to align time advance. If transmit later just delay next TX
next_offset = (int)round((this->time_adv_sec - time_adv_sec) * srslte_sampling_freq_hz(cell.nof_prb));
this->next_time_adv_sec = time_adv_sec;
#define TDD
#ifdef TDD
this->next_time_adv_sec = time_adv_sec+624 *SRSLTE_LTE_TS; //repair like this
#endif
Info("Applying time_adv_sec=%.1f us, next_offset=%d\n", time_adv_sec * 1e6, next_offset); } after repair, ue attach success
