BR-112020004962-B1 - A terminal that controls the reception of a reference signal from a wireless system based on information that allows frequency multiplexing between a data signal and a reference signal.

Abstract

User terminal (20) receives control information indicating one of a possible combination pattern from a plurality of parameters related to the arrangement of a demodulation reference signal in a radio resource; and controls the reception processing of a downlink signal transmitted by a base radio station based on information indicating that frequency multiplexing between a data signal and the demodulation reference signal is accepted and based on the control information received, the information indicating the acceptance of frequency multiplexing by a combination pattern from among the possible combination patterns, which include at least one of the plurality of parameters configured to a specific value.

Inventors

• Keisuke Saito
• Kazuaki Takeda
• Satoshi Nagata
• Yuichi Kakishima

Assignees

• NTT DOCOMO, INC

Dates

Publication Date

20260317

Application Date

20170914

Claims (5)

1. 1. Terminal (20) characterized in that it comprises: a receiving section (202) configured to receive a demodulation reference signal; a control section (203) configured to control the reception of the demodulation reference signal based on a parameter related to the mapping of the demodulation reference signal, wherein the parameters include both a port number of the demodulation reference signal and a number of symbols to which the demodulation reference signal is mapped, when the port number of the demodulation reference signal is set to a first specific value and the number of symbols to which the demodulation reference signal is mapped is set to a second specific value, a specific multiplexing method for the demodulation reference signal is supported, the port number of the demodulation reference signal and the number of symbols to which the demodulation reference signal is mapped are determined based on a relationship between an index to specify the port number of the demodulation reference signal and the number of symbols to which the demodulation reference signal is mapped and a number of code words, wherein the index is included in link control information decent, DCI.
2. 2. Terminal (20), according to claim 1, characterized in that when the port number of the demodulation reference signal is set to the first specific value and the number of symbols to which the demodulation reference signal is mapped is set to the second specific value, frequency multiplexing between the demodulation reference signal and a data signal is supported.
3. 3. Terminal (20), according to claim 1, characterized in that when the port number of the demodulation reference signal is set to the first specific value and the number of symbols to which the demodulation reference signal is mapped is set to the second specific value, multiplexing without frequency multiplexing between the demodulation reference signal and a data signal is supported.
4. 4. Terminal (20), according to claim 1, characterized in that the power of the demodulation reference signal, in the case where frequency multiplexing between the demodulation reference signal and a data signal is not supported, is greater than the power of the demodulation reference signal, in the case where frequency multiplexing between the demodulation reference signal and the data signal is supported.
5. 5. Terminal (20), according to claim 2, characterized in that when the number of ports for the demodulation reference signal is set to 2 and when the number of symbols to which the demodulation reference signal is mapped is set to 2, multiplexing between a plurality of the demodulation reference signals by a specific multiplexing method is supported.

Description

Technical Field [001] The present invention relates to a user terminal and a method of radio communication. Technical Background [002] Long Term Evolution (LTE) was specified to achieve higher data rates, lower latency, and/or the like in a Universal Mobile Telecommunications System (UMTS) network (see Non-Patent Literature (hereinafter referred to as "NPL") 1). Future LTE systems have also been studied to achieve wider bandwidth and higher speed based on LTE. Examples of future LTE systems include systems termed LTE-Advanced (LTE-A), Future Radio Access (FRA), 5th generation mobile communication system (5G), 5G plus (5G+), New Radio Access Technology (Nova-RAT), and the like. [003] Future radiocommunication systems (e.g., 5G) are expected to support a wide range of frequencies, from low carrier frequencies to high carrier frequencies. Future radiocommunication systems aim to flexibly support the arrangement (mapping) of reference or similar signals, given that propagation path environments and/or requirements differ greatly from one frequency band to another (such as low carrier frequencies and high carrier frequencies), for example. [004] For example, in future radiocommunication systems, it is assumed that a reference signal (e.g., demodulation reference signal) from a port (layer) assigned to a user terminal is arranged in radio features based on various methods and transmitted to the user terminal. In this case, for example, a base radio station notifies a user terminal about information related to the port assigned to the user terminal and about information on an arrangement method for the reference signal. List of Citations Non-Patent Literature NPL 13 GPP TS 36.300 v13.4.0, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 13),” June 2016 Summary of the Invention Technical Problem [005] However, an attempt to cover all reference signal arrangement methods in notifying information related to a port assigned to a user terminal causes an increase in signaling overhead. [006] The present invention is made in view of this point, and an objective of the present invention is to provide a user terminal and a radio communication method, which makes it possible to notify information related to a designated port to the user terminal and information related to a reference signal arrangement method while reducing an increase in signaling overhead. Solution to the Problem [007] A user terminal, according to one aspect of the present invention, includes: a receiver that receives control information indicating one of a possible combination pattern of a plurality of parameters related to the arrangement of a demodulation reference signal in a radio resource; and a controller that controls reception processing of a downlink signal transmitted by a base radio station, the controller controls reception processing based on information indicating that frequency multiplexing between a data signal and the demodulation reference signal is accepted and based on control information, the information indicating acceptance of frequency multiplexing by a combination pattern among possible combination patterns, which include at least one of the plurality of parameters configured to a specific value. Advantageous Effects of the Invention [008] According to one aspect of the present invention, it is possible to notify information relating to a port assigned to a user terminal and information relating to a reference signal arrangement method while reducing an increase in signaling overhead. Brief Description of the Drawings [009] FIG. 1 is a block diagram illustrating an example of an entire configuration of a base radio station, according to an embodiment of the present invention; [010] FIG. 2 is a block diagram illustrating an example of an entire configuration of a user terminal, according to an embodiment of the present invention; [011] FIG. 3 illustrates early examples of mapping patterns in an embodiment of the present invention; [012] FIG. 4 illustrates second examples of mapping patterns in an embodiment of the present invention; [013] FIG. 5 illustrates early examples of an arrangement method in an embodiment of the present invention; [014] FIG. 6 illustrates second examples of an arrangement method in an embodiment of the present invention; [015] FIG. 7 illustrates third examples of an arrangement method in an embodiment of the present invention; [016] FIG. 8 illustrates four examples of an arrangement method in an embodiment of the present invention; [017] FIG. 9 illustrates fifth examples of an arrangement method in an embodiment of the present invention; [018] FIG. 10 illustrates early examples of an arrangement method in which two-port DMRSs are multiplexed in an embodiment of the present invention; [019] FIG. 11 illustrates second examples of an arrangement method, in which two-port DMRSs are multiplexed in an emb