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US 12,451,945 B2Granted
Methods for adapting density of demodulation reference signals
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsLars Lindbom, Mattias Frenne, Martin Hessler, Karl Werner
Life of this patent
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Abstract
According to an aspect, a wireless node selects a set of reference signal antenna ports for use in transmitting data to other wireless nodes in a given transmit time interval, from a plurality of sets of reference signal antenna ports that are available for use and that include reference signal antenna ports having different reference signal densities in the frequency and/or time dimension. The wireless node sends a message to a second wireless node indicating a reference signal assignment and including an indication of the selected set of reference signal antenna ports.
Claims22
A method, in a first wireless node, the method comprising:
- selecting a set of demodulation reference signal antenna ports for use in transmitting data to or receiving data from a plurality of User Equipments, UEs, in a given transmit time interval, from a plurality of sets of demodulation reference signal antenna ports that are available for use, wherein at least two of sets of the plurality of sets of demodulation reference signal antenna ports have different demodulation reference signal densities in frequency dimension;
- and
- sending a message to a UE indicating the selected set of demodulation reference signal antenna ports, wherein the message indicates the selected set from a plurality of possible sets of available ports, the possible sets of available ports comprising:
- a first set of demodulation reference signal antenna ports comprising each odd subcarrier of a first physical resource block, wherein the first set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes;
- a second set of demodulation reference signal antenna ports comprising each even subcarrier of a second physical resource block, wherein the second set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes, wherein the demodulation reference signal antenna ports of the first set and second set are different;
- and
- a third set of demodulation reference signal antenna ports corresponding to a merger in at least one physical resource block of the first set of demodulation reference signal antenna ports and the second set of demodulation reference signal antenna ports, wherein the third set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes.
4 more elements
A first wireless node, wherein the first wireless node is adapted to:
- select a set of demodulation reference signal antenna ports for use in transmitting data to or receiving data from a plurality of User Equipments, UEs, in a given transmit time interval, from a plurality of sets of demodulation reference signal antenna ports that are available for use, wherein at least two of sets of the plurality of sets of demodulation reference signal antenna ports have different demodulation reference signal densities in frequency dimension;
- and
- send a message to a UE indicating the selected set of demodulation reference signal antenna ports, wherein the message indicates the selected set from a plurality of possible sets of available ports, the possible sets of available ports comprising:
- a first set of demodulation reference signal antenna ports comprising each odd subcarrier of a first physical resource block, wherein the first set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes;
- a second set of demodulation reference signal antenna ports comprising each even subcarrier of a second physical resource block, wherein the second set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes, wherein the demodulation reference signal antenna ports of the first set and second set are different;
- and
- a third set of demodulation reference signal antenna ports corresponding to a merger in at least one physical resource block of the first set of demodulation reference signal antenna ports and the second set of demodulation reference signal antenna ports, wherein the third set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes.
4 more elements
A method, in a User Equipment, UE, the method comprising:
- receiving, from a first wireless node, a message indicating a demodulation reference signal assignment to the UE, wherein the message includes an indication of a set of demodulation reference signal antenna ports selected from a plurality of available sets of demodulation reference signal antenna ports known to the UE for use in transmitting or receiving data, and wherein at least two of sets of the plurality of sets of demodulation reference signal antenna ports have different demodulation reference signal densities in frequency dimension;
- and
- identifying the indicated set of demodulation reference signal antenna ports from the received indication,
- wherein the message indicates the selected set of demodulation reference signal antenna ports from a plurality of possible sets of available ports, the possible sets of available ports comprising:
- a first set of demodulation reference signal antenna ports comprising each odd subcarrier of a first physical resource block, wherein the first set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes;
- a second set of demodulation reference signal antenna ports comprising each even subcarrier of a second physical resource block, wherein the second set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes, wherein the demodulation reference signal antenna ports of the first set and second set are different;
- and
- a third set of demodulation reference signal antenna ports corresponding to a merger in at least one physical resource block of the first set of demodulation reference signal antenna ports and the second set of demodulation reference signal antenna ports, wherein the third set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes.
5 more elements
A User Equipment, UE, wherein the UE is adapted to:
- receive, from a first wireless node, a message indicating a demodulation reference signal assignment to the UE, where the message includes an indication of a set of demodulation reference signal antenna ports selected from a plurality of available sets of demodulation reference signal antenna ports known to the UE for use in transmitting or receiving data, wherein at least two of sets of the plurality of sets of demodulation reference signal antenna ports include reference signal antenna ports have different demodulation reference signal densities in frequency dimension;
- and
- identify the indicated set of demodulation reference signal antenna ports from the received indication,
- wherein the message indicates the selected set from a plurality of possible sets of available ports, the possible sets of available ports comprising:
- a first set of demodulation reference signal antenna ports comprising each odd subcarrier of a first physical resource block, wherein the first set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes;
- and
- a second set of demodulation reference signal antenna ports comprising each even subcarrier of a second physical resource block, wherein the second set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes, wherein the demodulation reference signal antenna ports of the first set and second set are different;
- and
- a third set of demodulation reference signal antenna ports corresponding to a merger in at least one physical resource block of the first set of demodulation reference signal antenna ports and the second set of demodulation reference signal antenna ports, wherein the third set of demodulation reference signal antenna ports comprises one port or two antenna ports being separated from one another by orthogonal cover codes.
6 more elements
Dependencies are inferred from the claim text.