Patent ID: 8837373
Filing Date: 2014-09-16
Classification: H04B,H04W

Abstract:
1. A method in a main unit for a relay node, which main unit is connectible to a first radio unit and to a second radio unit, for synchronising wireless communication over the second radio unit with wireless communication over the first radio unit, wherein the main unit is configured for wireless communication with a donor base station via the first radio unit and configured for wireless communication with a user equipment via the second radio unit, the method comprising: transmitting, via the second radio unit, a synchronisation signal, receiving information concerning reception of the synchronisation signal at the first radio unit, computing a first timing difference corresponding to the time it takes for the synchronisation signal to propagate from the second radio unit to being received at the first radio unit, adjusting the downlink transmission timing at the second radio unit according to the first timing difference, transmitting, via the first radio unit, a reference signal, receiving information concerning reception of the reference signal at the second radio unit, estimating a second timing difference, corresponding to the time it takes for the reference signal to propagate from the first radio unit to being received at the second radio unit, and adjusting the expected timing for signals to be received from the user equipment at the second radio unit according to the second timing difference.