Transmission of NR Control Information in an LTE Downlink Subframe

Abstract

There is provided mechanisms for transmission of NR control information in an LTE downlink subframe. At least two symbols in the subframe are allocatable for LTE control information. A method is performed by a network node. The method comprises configuring resource elements for LTE transmission and resource elements for NR transmission within the subframe such that NR control information is allocated to resource elements of at least one symbol within the at least two symbols allocatable for the LTE control information in the subframe. The method comprises initiating transmission of the subframe from co-sited antennas, such that the resource elements for LTE transmission and the resource elements for NR transmission are transmitted from the co-sited antennas.

What is claimed is: 
     
         1 . A method implemented by a network node for transmission of New Radio (NR) control information in a Long Term Evolution (LTE) downlink subframe, the method comprising:
 configuring first resource elements in a first set of symbols in the subframe for transmission of LTE control information;   configuring second resource elements in the first set of symbols in the subframe for transmission of NR control information;   allocating downlink LTE data to third resource elements in a second set of symbols in the subframe such that the third resource elements overlap the second resource elements in the frequency domain but not in the time domain; and   initiating transmission of the subframe from co-sited antennas, such that the first resource elements for LTE transmission and the second resource elements for NR transmission are transmitted from the co-sited antennas.   
     
     
         2 . The method according to  claim 1 , wherein the first resource elements for LTE control information and the second resource elements for NR control information are combined on each antenna of the co-sited antennas. 
     
     
         3 . The method according to  claim 1 , wherein the first resource elements for LTE transmission are transmitted from a first antenna of the co-sited antennas and the second resource elements for NR transmission are transmitted from a second antenna of the co-sited antennas. 
     
     
         4 . The method according to  claim 1 , wherein the second resource elements configured with the NR control information occupy a last occurring symbol in the first set of symbols. 
     
     
         5 . The method according to  claim 1 , further comprising allocating LTE control information to the first resource elements. 
     
     
         6 . The method according to  claim 5 , wherein each symbol is composed of sub-carriers, and wherein the NR control information is allocated to second resource elements comprising less than all sub-carriers in at least one symbol in said first set of symbols used for transmission of NR control information. 
     
     
         7 . The method according to  claim 6 , wherein the LTE control information is allocated to remaining subcarriers in the at least one symbol in said first set of symbols to which NR control information is allocated. 
     
     
         8 . The method according to  claim 6 , wherein transmission power of the LTE control information is scaled such that less transmission power is used for the LTE control information allocated to resource elements in the at least one symbol to which the NR control information is allocated than for the remaining LTE control information. 
     
     
         9 . The method according to  claim 5 , wherein more transmission power is used for some of the remaining LTE control information than for other of the remaining LTE control information. 
     
     
         10 . The method according to  claim 1 , wherein more transmission power is used for some of the NR control information than for other of the NR control information. 
     
     
         11 . A network node for transmission of New Radio, NR, control information in a Long Term Evolution, LTE, downlink subframe comprising resource elements, wherein the resource elements of at least two symbols in the subframe are allocatable for LTE control information, the network node comprising processing circuitry, the processing circuitry being configured to cause the network node to:
 configuring first resource elements in a first set of symbols in the subframe for transmission of LTE control information;   configuring second resource elements in the first set of symbols in the subframe for transmission of NR control information;   allocating downlink LTE data to third resource elements in a second set of symbols in the subframe such that the third resource elements overlap the second resource elements in the frequency domain but not in the time domain; and   initiating transmission of the subframe from co-sited antennas, such that the first resource elements for LTE transmission and the second resource elements for NR transmission are transmitted from the co-sited antennas.   
     
     
         12 . The network node according to  claim 11 , wherein the first resource elements for LTE control information and the second resource elements for NR control information are combined on each antenna of the co-sited antennas. 
     
     
         13 . The network node according to  claim 11 , wherein the first resource elements for LTE transmission are transmitted from a first antenna of the co-sited antennas and the second resource elements for NR transmission are transmitted from a second antenna of the co-sited antennas. 
     
     
         14 . The network node according to  claim 11 , wherein the second resource elements configured with the NR control information occupy a last occurring symbol in the first set of symbols. 
     
     
         15 . The network node according to  claim 11 , further comprising allocating LTE control information to the first resource elements. 
     
     
         16 . The network node according to  claim 15 , wherein each symbol is composed of sub-carriers, and wherein the NR control information is allocated to second resource elements comprising less than all sub-carriers in at least one symbol in said first set of symbols used for transmission of NR control information. 
     
     
         17 . The network node according to  claim 16 , wherein the LTE control information is allocated to remaining subcarriers in the at least one symbol in said first set of symbols to which NR control information is allocated. 
     
     
         18 . The network node according to  claim 16 , wherein transmission power of the LTE control information is scaled such that less transmission power is used for the LTE control information allocated to resource elements in the at least one symbol to which the NR control information is allocated than for the remaining LTE control information. 
     
     
         19 . The network node according to  claim 15 , wherein more transmission power is used for some of the remaining LTE control information than for other of the remaining LTE control information. 
     
     
         20 . The network node according to  claim 11 , wherein more transmission power is used for some of the NR control information than for other of the NR control information.