Method and arrangement for reducing interference in a wireless communication network

摘要

The present invention relates to a method and arrangement for reducing interference in a cellular communication network. A radio base station of the network is configured to serve at least a first cell, where interference is reduced by selecting a link adaptation scheme for a UE in the first cell, The arrangement comprises means for receiving measurements on estimated channel quality, means for estimating channel quality for a future transmission by adjusting the received measurements on estimated channel quality based on knowledge of future UE scheduling in at least the first cell, and means for selecting the link adaptation scheme comprising a transmit power level based on the estimated channel quality for the future transmission.

主权项

1. A method for reducing interference in a cellular communication network, wherein a radio base station of the network is configured to serve at least a first cell and a second cell, where interference is reduced by selecting a link adaptation scheme for a first UE in the first cell, the method comprising:
receiving measurements on estimated channel quality; estimating channel quality for a future transmission by adjusting the received measurements on estimated channel quality based on knowledge of future UE scheduling that takes into account estimated disturbances to be caused by at least one other UE that is to be scheduled with the radio base station in at least the first cell and the second cell by:
estimating disturbance in at least the second cell that is to be caused by future transmission performed in accordance with the future UE scheduling; andestimating disturbance in the first cell that is to be caused by future transmission from other transmitters within the first cell performed in accordance with the future UE scheduling; selecting the link adaptation scheme based on the estimated channel quality for the future transmission, the link adaption scheme comprising a coding rate, a modulation scheme, a transmit power level, and a MIMO (Multiple Input Multiple Output) mode; determining, based on the selected link adaptation scheme, a noise margin indicative of how much noise the first UE is allowed to experience in order to be able to keep the selected link adaptation scheme for each scheduled UE; and using the determined noise margin as an upper boundary for sequential link adaptation of other transmissions, where the selected transmit power level further is used for sequential link adaptation of other transmissions.