Methods and devices for multiple access transmission

Abstract

Aspects of the present disclosure provide methods and devices for multiple access downlink transmissions from a network side component to one or more User Equipment (UE) or multiple access uplink transmissions from two or more UEs to a network side component. In a downlink direction, a network side device generates, for each sub-carrier of the block of sub-carriers, a single constellation point from one or more bits of a multi-bit symbol, from each of multiple layers. In an uplink direction, each UE maps at least one bit from one or more layers of multi-bit symbols onto a subset of a block of sub-carriers. The two or more UEs collectively transmit on the block of sub-carriers.

What is claimed is: 
     
         1 . A method of signal transmission, comprising:
 mapping, by a user equipment (UE), first k/q bits of a k-bit symbol onto a first sub-carrier of q non-zero sub-carriers of a total number of sub-carriers in a transmission resource allocated to the UE, k and q being positive integers;   mapping, by the UE, second k/q bits of the k-bit symbol onto a second sub-carrier of the q non-zero sub-carriers;   transmitting, by the UE, the first k/q bits as a first constellation point on the first sub-carrier; and   transmitting, by the UE, the second k/q bits as a second constellation point on the second sub-carrier.   
     
     
         2 . The method of  claim 1 , wherein the total number of sub-carriers is allocated as transmission resources for transmission by a plurality of UEs including the UE in an uplink direction. 
     
     
         3 . The method of  claim 1 , further comprising:
 assigning, by the UE, a bit significance to each of the first k/q bits or each of the second k/q bits of the k-bit symbol.   
     
     
         4 . The method of  claim 3 , wherein assigning the bit significance to each of the first k/q bits or each of the second k/q bits comprises assigning the bit significance to each of the first k/q bits or each of the second k/q bits so that bits from the k-bit symbol are not assigned a lowest significance in more than one constellation point. 
     
     
         5 . The method of  claim 3 , further comprising:
 sorting, by the UE, the first or second k/q bits of the k-bit symbol with respect to each other based on the bit significance assigned to each of the respective first or second k/q bits of the k-bit symbol.   
     
     
         6 . The method of  claim 1 , wherein k is 2, and q is 2. 
     
     
         7 . An apparatus comprising:
 a non-transitory memory storage comprising instructions; and   one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to:   map first k/q bits of a k-bit symbol onto a first sub-carrier of q non-zero sub-carriers of a total number of sub-carriers in a transmission resource allocated to the apparatus, k and q being positive integers;   map second k/q bits of the k-bit symbol onto a second sub-carrier of the q non-zero sub-carriers;   transmit the first k/q bits as a first constellation point on the first sub-carrier; and   transmit the second k/q bits as a second constellation point on the second sub-carrier.   
     
     
         8 . The apparatus of  claim 7 , wherein the total number of sub-carriers is allocated as transmission resources for transmission by a plurality of UEs including the apparatus in an uplink direction. 
     
     
         9 . The apparatus of  claim 7 , wherein the one or more processors execute the instructions further to:
 assign a bit significance to each of the respective first or second k/q bits of the k-bit symbol.   
     
     
         10 . The apparatus of  claim 9 , wherein assigning the bit significance to each of the respective first or second k/q bits of the k-bit symbol comprises assigning the bit significance to each of the respective first or second k/q bits so that bits from the k-bit symbol are not assigned a lowest significance in more than one constellation point. 
     
     
         11 . The apparatus of  claim 9 , wherein the one or more processors execute the instructions further to:
 sort the first or second k/q bits of the k-bit symbol with respect to each other based on the bit significance assigned to each of the respective first or second k/q bits of the k-bit symbol.   
     
     
         12 . The apparatus of  claim 7 , wherein k is 2, and q is 2. 
     
     
         13 . A non-transitory computer-readable media storing computer instructions for signal transmission, that when executed by one or more processors, cause the one or more processors to perform steps of:
 mapping first k/q bits of a k-bit symbol onto a first sub-carrier of q non-zero sub-carriers of a total number of sub-carriers in a transmission resource allocated to the UE, k and q being positive integers;   mapping second k/q bits of the k-bit symbol onto a second sub-carrier of the q non-zero sub-carriers;   transmitting the first k/q bits as a first constellation point on the first sub-carrier; and   transmitting the second k/q bits as a second constellation point on the second sub-carrier.   
     
     
         14 . The non-transitory computer-readable media of  claim 13 , wherein the total number of sub-carriers is allocated as transmission resources for transmission by a plurality of UEs in an uplink direction. 
     
     
         15 . The non-transitory computer-readable media of  claim 13 , wherein the steps further comprise:
 assigning a bit significance to each of the respective first or second k/q bits of the k-bit symbol.   
     
     
         16 . The non-transitory computer-readable media of  claim 15 , wherein assigning the bit significance to each of the respective first or second k/q bits of the k-bit symbol comprises assigning the bit significance to each of the respective first or second k/q bits so that bits from the k-bit symbol are not assigned a lowest significance in more than one constellation point. 
     
     
         17 . The non-transitory computer-readable media of  claim 15 , wherein the steps further comprise:
 sorting the first or second k/q bits of the k-bit symbol with respect to each other based on the bit significance assigned to each of the respective first or second k/q bits of the k-bit symbol.   
     
     
         18 . The non-transitory computer-readable media of  claim 13 , wherein k is 2, and q is 2.