1. A radio network node for use in a radio communications network using a time division duplex, TDD, structure to communicate with user equipments, UEs, the radio network node comprising:a radio interface configured to receive uplink data from the UEs, and transmit downlink data to the UEs;
a processor and;
a memory containing instructions executable by the processor to configure the radio network node to:
apply a TDD structure comprising at least one guard period in each slot between a downlink transmission period and an uplink reception period, the downlink transmission period comprising at least two downlink symbols in which the radio network node may transmit data to a UE, the uplink reception period comprising a single uplink symbol in which the radio network node may receive data from the UE;
increase the guard period from a previous duration to an extended duration relative to the previous duration if at least one synchronization degradation criterion is fulfilled;
extend the guard period interval before the uplink symbol period in the TDD structure by an amount equal to a duration of a fraction of a symbol in the TDD structure;
offset the uplink reception period to be initiated at an earlier position in the TDD structure, the offset corresponding to the duration of the fraction of a symbol; and
replace one downlink symbol of the at least two downlink symbols in the TDD structure with an extended guard period symbol.