CROSS REFERENCE TO RELATED APPLICATIONS

This is a National Stage Application, filed under 35 U.S.C. 371, of International Patent Application No. PCT/CN2018/079023, filed on Mar. 14, 2018, which claims priority to Chinese patent application No. 201710067997.6 filed on Feb. 7, 2017, contents of both of which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the field of communications and, in particular, to phase tracking reference signal (PTRS) configuration, determination and information feedback methods and devices.

BACKGROUND

Phase noise refers to random variations of the phase of an output signal of a system (such as various radio frequency devices) due to various noise. Three elements for describing a radio wave are an amplitude, a frequency and a phase. The frequency and the phase influence each other. In an ideal case, a radio signal of a fixed frequency has a fixed fluctuation period, just as a normal flight of an airplane which has fixed departure time. A pulse signal (with a spectral width close to zero) in frequency domain is a sine wave of a certain frequency in time domain. However, practically, a signal always has a certain spectral width, and due to noise, the signal has power at a distance far away from a central frequency, which is just like a flight with a delay of more than one hour. A signal at a distance far away from the central frequency is called a sideband signal. The sideband signal may be squeezed into an adjacent frequency, as a delayed flight which may occupy time of other flights and cause a confused flight schedule. The sideband signal is called the phase noise.

In a practical communication system, the perpetual phase noise results from all devices using Local Oscillation (LO). For an Orthogonal Frequency Division Multiplexing (OFDM) system, the importance of maintaining orthogonality between subcarriers is apparent so that the phase noise in the OFDM system mainly results from the LO of a transmitting end and a receiving end.

The magnitude of the phase noise is related to the frequency. A high frequency system has a more serious phase noise problem. Since the noise is inherently multiplicative and cannot be handled as additive noise by increasing power or multi-antenna forming to improve performance, a reference signal for measuring the phase noise is introduced for compensation. A phase noise compensation reference signal may be simply referred to as a phase tracking reference signal (PTRS).

SUMMARY

The following is a summary of the subject matter described herein in detail. This summary is not intended to limit the scope of the claims.

Embodiments of the present disclosure provide phase tracking reference signal (PTRS) configuration, determination and information feedback methods and devices.

An embodiment of the present disclosure provides PTRS configuration method configuration method. The method includes a step described below.

A first node transmits control information to a second node, where the control information is used for indicating a configuration parameter of a PTRS to the second node.

The PTRS is transmitted by the first node or the second node.

An embodiment of the present disclosure provides PTRS determination method determination method. The method includes a step described below.

A second node determines a configuration parameter of the PTRS through control information transmitted by a first node and/or an agreed implicit rule.

The PTRS is transmitted by the first node or the second node.

An embodiment of the present disclosure provides a information feedback method. The method includes a step described below.

A third node transmits control information to a fourth node, where the control information is used for feeding received power or quality information of the PTRS back to the fourth node.

An embodiment of the present disclosure provides PTRS configuration device configuration device. The device is applied to a first node and includes a configuration unit.

The configuration unit is configured to transmit control information to a second node. The control information is used for indicating a configuration parameter of the PTRS to the second node.

The PTRS is transmitted by the first node or the second node.

An embodiment of the present disclosure provides PTRS determination device determination device. The device is applied to a second node and includes a determination unit.

The determination unit is configured to determine a configuration parameter of the PTRS through control information transmitted by a first node and/or an agreed implicit rule.

The PTRS is transmitted by the first node or the second node.

An embodiment of the present disclosure provides a PTRS information feedback device. The device is applied to a third node and includes a feedback unit.

The feedback unit is configured to transmit control information to a fourth node. The control information is used for feeding received power or quality information of the PTRS back to the fourth node.

An embodiment of the present disclosure further provides a computer-readable storage medium. The computer-readable storage medium is configured to store computer-executable instructions for implementing any one of the methods described above when are executed by a processor.

In solutions in the embodiments of the present disclosure, the first node transmits the control information to the second node. The control information is used for indicating the configuration parameter of the PTRS to the second node and the PTRS is transmitted by the first node or the second node. The second node determines the configuration parameter of the PTRS through the control information transmitted by the first node and/or the agreed implicit rule. The third node transmits the control information to the fourth node. The control information is used for feeding the received power or the quality information of the PTRS back to the fourth node. The solutions in the embodiments of the present disclosure can effectively reduce reference signal overheads and improve estimation performance with higher flexibility and are affected to a smaller degree by an interference or blocking problem.

Other aspects can be understood after the drawings and the detailed description are read and understood.

