Patent ID: 11936598
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. A radio node for Time Division Duplex, TDD, communications, the radio node comprising processing circuitry configured to:
inject a downlink antenna calibration signal into a time window, the time window being positioned, in a time domain, between a TDD uplink subframe to a TDD downlink subframe, the time window having a time duration less than the TDD uplink subframe and TDD downlink subframe;
the time window being part of an offset region that includes a time period in which the radio node is switchable from a receiving mode to a transmitting mode, the downlink antenna calibration signal being configured such that a time headroom follows the injection of the downlink antenna calibration signal into the time window, the time headroom having a duration configured to account for a timing uncertainty of a receiving radio node; and
perform at least one antenna calibration function using the injected downlink antenna calibration signal.