Adaptive numerology for beamforming training

Abstract

A method for communications is proposed. The method may comprise determining a numerology for beamforming training supportable by a network node and a terminal device. The method may further comprise configuring the numerology for the beamforming training. The numerology may define radio resources with adaptive properties used for transmissions of beamforming training signals. The method may further comprise performing the beamforming training based at least partly on the configured numerology.

What is claimed is: 
     
         1 . A method implemented at a radio device, comprising:
 determining a numerology for beamforming training supportable by a network node and a terminal device;   configuring the numerology for the beamforming training, wherein the numerology defines radio resources with adaptive properties used for transmissions of beamforming training signals; and   performing the beamforming training based at least partly on the configured numerology.   
     
     
         2 . The method according to  claim 1 , wherein the radio resources with adaptive properties comprise orthogonal frequency division multiplexing symbols having larger sub-carrier spacing than that for regular transmissions. 
     
     
         3 . The method according to  claim 1 , wherein the numerology for the beamforming training is configured via system information from the network node to the terminal device according to a predefined rule. 
     
     
         4 . The method according to  claim 1 , wherein the numerology for the beamforming training is determined by selecting it from one or more numerologies for beamforming training supportable by the terminal device, and wherein the one or more numerologies are indicated by a report from the terminal device. 
     
     
         5 . The method according to  claim 4 , wherein the numerology for the beamforming training is configured through one or more of the following:
 signaling between the network node and the terminal device; and   an indicator from the network node.   
     
     
         6 . The method according to  claim 1 , wherein the numerology for the beamforming training is supportable by one or more other terminal devices sharing the beamforming training signals with the terminal device. 
     
     
         7 . The method according to  claim 1 , wherein the numerology for the beamforming training is determined based at least partly on one or more of the following:
 geometry of the terminal device;   mobility of the terminal device;   a radio link condition;   a procedure or a stage of a procedure currently performed for the beamforming training; and   allocation of the radio resources used for transmissions of beamforming training signals.   
     
     
         8 . The method according to  claim 1 , wherein in response to the numerology for the beamforming training meeting one or more predefined requirements, the method further comprises:
 determining another numerology for beamforming training to replace the numerology for the beamforming training, wherein the another numerology is supportable by the network node and the terminal device;   configuring the another numerology for the beamforming training to adjust the adaptive properties of the radio resources; and   performing the beamforming training based at least partly on the another configured numerology.   
     
     
         9 . The method according to  claim 1 , wherein the beamforming training is performed by combining time multiplexing with at least one of frequency multiplexing and spatial multiplexing. 
     
     
         10 . An apparatus, comprising:
 one or more processors; and   one or more memories comprising computer program codes,   the one or more memories and the computer program codes configured to, with the one or more processors, cause the apparatus at least to:
 determine a numerology for beamforming training supportable by a network node and a terminal device; 
 configure the numerology for the beamforming training, wherein the numerology defines radio resources with adaptive properties used for transmissions of beamforming training signals; and 
 perform the beamforming training based at least partly on the configured numerology. 
   
     
     
         11 . A method implemented at a radio device, comprising:
 obtaining indication information which indicates configuration of a numerology for beamforming training supportable at least by a terminal device, wherein the numerology defines radio resources with adaptive properties used for transmissions of beamforming training signals; and   performing the beamforming training based at least partly on the configuration of the numerology.   
     
     
         12 . The method according to  claim 11 , wherein the radio resources with adaptive properties comprise orthogonal frequency division multiplexing symbols having larger sub-carrier spacing than that for regular transmissions. 
     
     
         13 . The method according to  claim 11 , wherein the indication information is obtained via system information from a network node to the terminal device according to a predefined rule. 
     
     
         14 . The method according to  claim 11 , further comprising:
 transmitting a report from the terminal device to a network node, wherein the report indicates one or more numerologies for beamforming training supportable by the terminal device, and wherein the one or more numerologies comprise the numerology for the beamforming training.   
     
     
         15 . The method according to  claim 14 , wherein the indication information is obtained through one or more of the following:
 signaling between a network node and the terminal device; and   an indicator from the network node.   
     
     
         16 . The method according to  claim 11 , wherein the numerology for the beamforming training is supportable by one or more other terminal devices sharing the beamforming training signals with the terminal device. 
     
     
         17 . The method according to  claim 11 , wherein the numerology for the beamforming training is based at least partly on one or more of the following:
 geometry of the terminal device;   mobility of the terminal device;   a radio link condition;   a procedure or a stage of a procedure currently performed for the beamforming training; and   allocation of the radio resources used for transmissions of beamforming training signals.   
     
     
         18 . The method according to  claim 11 , further comprising:
 obtaining new indication information which indicates configuration of another numerology for beamforming training to replace the numerology for the beamforming training, wherein the another numerology is supportable at least by the terminal device; and   performing the beamforming training based at least partly on the configuration of the another numerology which adjusts the adaptive properties of the radio resources.   
     
     
         19 . The method according to  claim 11 , wherein the beamforming training is performed by combining time multiplexing with at least one of frequency multiplexing and spatial multiplexing.