A technique may include transmitting, by a user device in a proximity-based services wireless network via a first time-frequency resource identified by a first logical time index within N logical time resources and a first logical frequency index in the range from 0 to M−1, a first occurrence of a signal for the user device during a transmission period; determining a time index adjustment associated with the first logical frequency index; determining, by the user device, a second logical time index of a second time-frequency resource for transmitting from the user device a second occurrence of the signal within the transmission period, the second logical time index being determined based on the first logical time index and the time index adjustment associated with the first logical frequency index; and transmitting, by the user device via the second time-frequency resource, a second occurrence of the signal during the transmission period.