US 12,328,752 B2
Method and network device for link adaptation
Rui Fan, Beijing (CN); Huaisong Zhu, Beijing (CN); and Chi Chuen Yuen, Beijing (CN)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/609,584
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed May 10, 2019, PCT No. PCT/CN2019/086419
§ 371(c)(1), (2) Date Nov. 8, 2021,
PCT Pub. No. WO2020/227854, PCT Pub. Date Nov. 19, 2020.
Prior Publication US 2022/0191881 A1, Jun. 16, 2022
Int. Cl. H04W 72/542 (2023.01); H04L 1/1607 (2023.01)
CPC H04W 72/542 (2023.01) [H04L 1/1607 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method in a network device for link adaptation, comprising:
estimating a probability distribution of downlink Signal to Interference plus Noise Ratio (SINR) for a terminal device based on one or more Negative Acknowledgement (NACK) messages from the terminal device, the estimating comprising:
updating a probability value for each of a plurality of SINR candidates iteratively based on the one or more NACK messages; and
updating the probability value for each of the plurality of SINR candidates based on a forgetting factor when the terminal device has not been scheduled for downlink transmission for a predetermined time period, the updating when the terminal device has not been scheduled for downlink transmission being based on P′i=(1−α)*Pi+α/N, α denoting the forgetting factor, Pi denoting a previous estimated probability value an i-th SINR candidate, N denoting a total number of the SINR candidates, and P′i denoting the updated probability value for the i-th SINR candidate, i and N being positive integers; and
determining a Modulation and Coding Scheme (MCS) for downlink transmission to the terminal device based on the estimated probability distribution of downlink SINR.