Method of controlling a communications link

摘要

The present invention is directed to a method of controlling a communications link and apparatus configured to perform this method. This invention is particularly related to but in no way limited to MIMO (multiple inputs multiple outputs) wireless communications systems. The method comprises the steps of determining at the receiver the quality of the communications link and based on this, selecting a group of transmission parameters and an element from this group. These selections are then communicated to the transmitter. The transmission parameter may be the transmission configuration such as the modulation and coding scheme. The invention minimizes the required feedback signaling from the receiver to the transmitter by exploiting temporal correlation of the parameter being controlled, whilst allowing rapid selection of the parameter.

主权项

1. A method for controlling a communication link between a user equipment and a base station of a wireless network, the method comprising:
at the user equipment:
receiving signals from the base station of the wireless network;determining a quality of a communication link based on the received signals;selecting a predefined group of transmission parameters including fewer elements than a set of transmission parameters and selecting at least one transmission parameter from the selected predefined group of transmission parameters based on the determined quality of the communication link, wherein the selection of the predefined group of transmission parameters is separated in time from the selection of the at least one transmission parameter and the selection of the at least one transmission parameter is made more frequently than the selection of the predefined group of transmission parameters;sending to the base station an identification of the at least one selected transmission parameter from the selected predefined group of transmission parameters, wherein the at least one selected transmission parameter represents a command to request a change of the predefined group of transmission parameters, the command including an up or down request to change to a next or previous predefined group of transmission parameters; andsending to the base station an identification of the selected predefined group of transmission parameters when the selected predefined group of transmission parameters changes.