Patent ID: 9125204
Filing Date: 2015-09-01
Classification: H01L,H04L,H04W

Abstract:
1. A base station comprising: first circuitry configured to transmit information to a wireless transmit/receive unit (WTRU) indicating an assignment of periodic time slots to transmit sounding signals; second circuitry configured to receive sounding signals from the WTRU in the assigned periodic time slots in response to the transmitted information, wherein the base station does not receive any data from the WTRU at a same time that the base station receives the sounding signals from the WTRU, wherein a timing of reception of the sounding signals in response to the transmitted information in a time division duplex (TDD) mode differs from a timing of reception of the sounding signals in response to the transmitted information in a frequency division duplex (FDD) mode, and the received sounding signals of the WTRU are distinguishable from sounding signals from other WTRUs; and third circuitry configured to transmit beamformed downlink transmissions to the WTRU based on the received sounding signals.