US 10,833,823 B2 · Adaptive demodulation reference signals in wireless communication systems

Abstract

The described technology is generally directed towards adapting the demodulation reference signal sent in a wireless resource data block based on channel estimation performance. In general, if the demodulation reference signal received was not successfully able to be used to demodulate the resource data block, the demodulation reference signal density can be increased up to a maximum density, which costs resource elements but improves the channel estimation accuracy. If the demodulation reference signal received was able to be used to demodulate the resource data block, the demodulation reference signal density can be decreased down to minimum density, which saves resource elements for data. The network device can use HARQ ACK/NACK data (e.g., a current count or counted over a time period) to determine channel estimation performance, and/or the user equipment can recommend a demodulation reference signal density change.

Claims20

Dependent claims

A method, comprising:

communicating, via a network by network equipment comprising a processor, first demodulation reference signals, corresponding to a first density of demodulation reference signals in a first resource block, to a user equipment to facilitate a channel estimation by the user equipment;
determining, by the network equipment, a change in channel estimation performance based on the channel estimation estimated by the user equipment relative to a previous channel estimation performance;
and
in response to the determining the change in the channel estimation performance and determining that the first density has not reached a density limit, communicating, from the network equipment to the user equipment:
information corresponding to a change to a second density of demodulation reference signals from the first density, and
second demodulation reference signals, corresponding to the second density of demodulation reference signals, in a second resource block.

3 more elements

A non-transitory machine-readable medium, comprising executable instructions that, when executed by a processor of network equipment, facilitate performance of operations, the operations comprising:

communicating first demodulation reference signals, corresponding to a density of demodulation reference signals in a first resource block, to a user equipment to facilitate channel estimation by the user equipment;
determining that a reduction in channel estimation performance of the channel estimation by the user equipment has occurred;
and
in response to the determining that the reduction in the channel estimation performance has occurred and determining that the density has not reached a maximum density:
communicating information corresponding to an increased density of demodulation reference signals to the user equipment, the increased density being greater than the density, and
communicating second demodulation reference signals, corresponding to the increased density of demodulation reference signals in a second resource block, to the user equipment.

3 more elements

A system, comprising:

a processor;
and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, the operations comprising:
communicating first demodulation reference signals, corresponding to a first density of demodulation reference signals in a first resource block, to a user equipment to facilitate a channel estimation by the user equipment;
determining a change in channel estimation performance based on the first channel estimation estimated by the user equipment relative to a previous channel estimation performance;
and
in response to the determining the change in the channel estimation performance and determining that the first density has not reached a density limit, communicating to the user equipment:
information corresponding to a change to a second density of demodulation reference signals from the first density, and
second demodulation reference signals, corresponding to the second density of demodulation reference signals, in a second resource block.

6 more elements

Dependencies are inferred from the claim text.

Adaptive demodulation reference signals in wireless communication systems

Life of this patent

Adaptive demodulation reference signals in wireless communication systems

Life of this patent

Abstract

Claims20