Telefonaktiebolaget Lm Ericsson (publ)

Michel Chauvin

Hua Xu

Chandra Sekhar Bontu

Xixian Chen

Jianguo Long

Guoqiang Lu

James Jianfeng Weng

Peter Hazy

Michael McKenna

Ying Shao

Michael Roger

A method and network node for performing link adaption are disclosed. In one embodiment, a channel state information, CSI, measurement is received from a wireless device. An information carrying capacity, ICC, over a number of scheduling blocks, SBs, for a plurality of modulation formats for a target criteria is determined based at least in part on the CSI measurement from the wireless device. A modulation format of the plurality of modulation formats with a maximum ICC is selected. A transport block size, TBS, is determined for the selected modulation format. Link adaptation is performed based on the determined TBS.

Configuring transmission parameters in a cellular system

Systems and methods for Multiple-Input and Multiple-Output (MIMO) rank reduction to improve downlink throughput are disclosed. A method of operation of a radio access node includes determining that an imbalance between parallel channels of a spatial multiplexing downlink transmission to a wireless device is greater than an imbalance threshold and/or that a Negative Acknowledgement (NACK) rate over time for the parallel channels of a spatial multiplexing downlink transmission reported by the wireless device is greater than a NACK rate threshold. The method also includes, in response to determining that the imbalance between the parallel channels is greater than the imbalance threshold and/or that the NACK rate is greater than the NACK rate threshold, performing a fast rank reduction for a next downlink transmission whereby a rank is reduced from a rank indicator reported by the wireless device to some lower rank. Reducing the rank may improve downlink throughput.

MIMO rank reduction to improve downlink throughput

Growing community of inventors

Kanata, Canada

Michel Chauvin