Method for determining rank information

Abstract

Provided are a method and device for feeding back and receiving channel information. The method comprises: determining a candidate resource set, selecting M resources from the candidate resource set, and transmitting at least one of indication information or channel state information of the selected M resources to a first communication node, where M is a positive integer; a selection criterion for selecting the M resources from the candidate resource set is determined in at least one of following manners: a selection criterion or a selection criterion set is agreed with the first communication node, and a selection criterion or a selection criterion set is obtained according to received indication information transmitted by the first communication node, and the selection criterion set comprises at least one selection criterion.

1 - 20 . (canceled) 
     
     
         21 . A method for determining rank information, comprising:
 receiving, by a second communication node, configuration information transmitted by a first communication node, wherein the configuration information comprises the rank information;   determining, by the second communication node, channel state information according to the rank information in the configuration information; and   reporting, by the second communication node, the determined channel state information to the first communication node.   
     
     
         22 . The method according to  claim 21 , wherein the rank information is comprised in the configuration information in one of the following manners:
 a candidate resource set comprises N first sets, wherein each first set corresponds to a piece of the rank information, and N is a natural number;   the candidate resource set corresponds to a piece of the rank information; or   the rank information is comprised in configuration information of a second set related to the candidate resource set, wherein the second set comprises a channel state information (CSI) report set.   
     
     
         23 . The method according to  claim 22 , wherein the rank information comprises one of following characteristics:
 the rank information is obtained through the indication information transmitted by the first communication node;   the rank information corresponding to a set represents the maximum number of supportable layers corresponding to the set;   the rank information corresponding to a set represents a number of supportable layers corresponding to the set; or   selected rank information is obtained according to the N first sets, and is fed back to the first communication node.   
     
     
         24 . The method according to  claim 21 , wherein the rank information is comprised in the configuration information in the following manner:
 a CSI-RS resource is configured in first configuration information, and the rank information corresponding to the CSI-RS resource is configured in second configuration information.   
     
     
         25 . The method according to  claim 21 , wherein the rank information is comprised in the configuration information in the following manner:
 the configuration information comprises rank information corresponding to a CSI-RS resource and port selection information corresponding to the rank information; wherein the port selection information represents X ports selected from ports comprised in the CSI-RS resource, and X is equal to the rank information.   
     
     
         26 . The method according to  claim 21 , further comprising:
 determining a candidate resource set and a channel quality threshold, selecting M resources from the candidate resource set according to the channel quality threshold, and transmitting indication information of the selected M resources and information of M to the first communication node, wherein M is a positive integer or equal to 0.   
     
     
         27 . The method according to  claim 26 , wherein a value of M is determined in the following manners:
 determining the value of M according to the channel quality threshold agreed with the first communication node; and   determining the value of M according to M_Max, wherein M_Max is a value agreed with the first communication node, and the value of M agreed with the first communication node is less than or equal to M_Max.   
     
     
         28 . The method according to  claim 26 , the transmitting the information of M to the first communication node comprising:
 in response to channel quality of each of all resources in the candidate resource set being less than the channel quality threshold, reporting the information of M which is equal to 0 to the first communication node.   
     
     
         29 . A method for determining rank information, comprising:
 transmitting, by a first communication node, configuration information to a second communication node, wherein the configuration information comprises the rank information; and   receiving, by the first communication node, channel state information transmitted by the second communication node, wherein the channel state information is determined by the second communication node according to the rank information in the configuration information.   
     
     
         30 . The method according to  claim 29 , wherein the rank information is comprised in the configuration information in one of the following manners:
 a candidate resource set comprises N first sets, wherein each first set corresponds to a piece of the rank information, and N is a natural number;   the candidate resource set corresponds to a piece of the rank information; or   the rank information is comprised in configuration information of a second set related to the candidate resource set, wherein the second set comprises a channel state information (CSI) report set.   
     
     
         31 . The method according to  claim 29 , wherein the rank information comprises one of following characteristics:
 the rank information is obtained through the indication information transmitted by the first communication node;   the rank information corresponding to a set represents the maximum number of supportable layers corresponding to the set;   the rank information corresponding to a set represents a number of supportable layers corresponding to the set; or   selected rank information is obtained according to the N first sets, and is fed back to the first communication node.   
     
     
         32 . The method according to  claim 29 , wherein the rank information is comprised in the configuration information in the following manner:
 a CSI-RS resource is configured in first configuration information, and the rank information corresponding to the CSI-RS resource is configured in second configuration information.   
     
     
         33 . The method according to  claim 29 , wherein the rank information is comprised in the configuration information in the following manner:
 the configuration information comprises rank information corresponding to a CSI-RS resource and port selection information corresponding to the rank information; wherein the port selection information represents X ports selected from ports comprised in the CSI-RS resource, and X is equal to the rank information.   
     
     
         34 . The method according to  claim 29 , further comprising:
 receiving, by the first communication node from the second communication node, indication information of a selected M resources and information of M; wherein M is a positive integer or equal to 0, wherein the M resources are selected by the second communication node from a candidate resource set according to the channel quality threshold.   
     
     
         35 . The method according to  claim 34 , further comprising:
 in response to M is equal to 0, obtaining, by the first communication node, that channel quality of each of all resources in the candidate resource set is less than an agreed threshold.   
     
     
         36 . A second communication node, comprising:
 a processor; and   a memory for storing instructions executable by the processor,   wherein the processor is configured to:   receive configuration information transmitted by a first communication node, wherein the configuration information comprises the rank information;   determine channel state information according to the rank information in the configuration information; and   report the determined channel state information to the first communication node.   
     
     
         37 . The second communication node according to  claim 36 , wherein the rank information is comprised in the configuration information in the following manner:
 the configuration information comprises rank information corresponding to a CSI-RS resource and port selection information corresponding to the rank information; wherein the port selection information represents X ports selected from ports comprised in the CSI-RS resource, and X is equal to the rank information.   
     
     
         38 . The second communication node according to  claim 36 , wherein the processor is further configured to:
 determine a candidate resource set and a channel quality threshold, select M resources from the candidate resource set according to the channel quality threshold, and transmit indication information of the selected M resources and information of M to the first communication node, wherein M is a positive integer or equal to 0;   in response to channel quality of each of all resources in the candidate resource set being less than the channel quality threshold, report the information of M which is equal to 0 to the first communication node.   
     
     
         39 . A first communication node, comprising:
 a processor; and   a memory for storing instructions executable by the processor,   wherein the processor is configured to implement the method of  claim 29 .   
     
     
         40 . The first communication node according to  claim 39 , wherein the processor is further configured to:
 receive indication information of a selected M resources and information of M from the second communication node, wherein M is a positive integer or equal to 0, wherein the M resources are selected by the second communication node from a candidate resource set according to the channel quality threshold;   in response to M is equal to 0, obtain that channel quality of each of all resources in the candidate resource set is less than an agreed threshold.