Implementing codebook subset restrictions in wireless communication systems

摘要

In MU-MIMO scenarios, a transmitting node (700) receives feedback on a feedback channel from a receiving node (1200) regarding a channel between the transmitting and receiving nodes (700, 1200). The feedback also includes preferences of the receiving node (1200). However, the feedback may not always be useful. For example, the receiving node (1200) may indicate a preferred rank in the feedback that the transmitting node (700) cannot accommodate. To address such issues, mechanisms for the transmitting node (700) to convey its preferences to the receiving node (1200) are proposed. The receiving node (1200), with such knowledge, can provide more useful feedback information to the transmitting node (700).

主权项

1. A method performed at a transmitting node of a wireless network to provide transmission control information to a receiving node, the method comprising:
from the transmitting node, providing feedback restriction information to the receiving node over a control channel, the feedback restriction information specifying restrictions on a feedback report to be provided from the receiving node, the feedback restriction information comprising one or more feedback restriction fields, and a corresponding feedback restriction value specifying restrictions on one or more feedback parameters of the feedback report; at the transmitting node, receiving the feedback report from the receiving node, the feedback report comprising the one or more feedback parameters, each feedback parameter indicating a channel characteristic of a wireless channel between the transmitting node and the receiving node or indicating a transmission characteristic preferred by the receiving node of data transmission from the transmitting node to the receiving node; and from the transmitting node, providing the transmission control information to the receiving node based on the feedback parameters, the transmission control information specifying one or more transmission characteristics that will be applied by the transmitting node in transmitting data to the receiving node, wherein the transmission control information is provided to the receiving node over the same control channel used in providing the feedback restriction information.