Patent ID: 8929309
Filing Date: 2015-01-06
Classification: H04B,H04L

Abstract:
1. A method of feedback reporting using long-term feedback when short-term feedback is absent, the method comprising: at a wireless transmit receiver unit (WTRU): determining a long-term precoder based on a long-term precoding matrix index corresponding to one or more channel statistics; determining a short-term precoder based on a formula associated with one or more system parameters, wherein the short-term precoder is determined based on the formula associated with the one or more system parameters by accessing a set of predefined precoders stored in the WTRU and accessible thereby and selecting the short-term precoder from the set of predefined precoders using the formula associated with the one or more system parameters, the one or more system parameters comprising at least one of the following: sub-frame index, cell identifier (ID), and WTRU ID; calculating channel quality index (CQI) based on a combination of the long-term precoder and the short-term precoder; and transmitting the CQI to a base station.