Method of transmitting channel state information-reference signal (CSI-RS), base station, and user equipment

Patent metadata

Field	Value
Publication number	US-12176983-B2
Application number	US-201816651003-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Sep 29, 2017
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A method of transmitting Channel State Information (CSI)-Reference Signals (RSs) in a wireless communication system that includes a base station (BS) and a user equipment (UE) includes transmitting, from the BS to the UE, first multiple CSI-RSs in a CSI-RS resource set that consists of CSI-RS resources. The first multiple CSI-RSs are transmitted using the CSI-RS resources, respectively. The CSI-RS resource set is repeated in a time domain or a frequency domain. The transmitting transmits second multiple CSI-RSs in the repeated CSI-RS resource set.

First claim

What is claimed is:

1. A user equipment (UE) comprising:
a receiver that receives, by higher layer signaling, information for configuring multiple Channel State Information-Reference Signal (CSI-RS) resource sets; and
a processor that, for each of the multiple CSI-RS resource sets, measures multiple CSI-RS resources and reports, based on the measurement results, an index of at least one CSI-RS resource selected from the multiple CSI-RS resources,
wherein:
a plurality of groups, each including multiple CSI-RS resource sets are transmitted repeatedly,
each of the multiple CSI-RS resource sets is associated with a different beam,
the multiple CSI-RS resources for each of the multiple CSI-RS resource sets are transmitted in different symbols,
the receiver repeatedly receives the plurality of groups including the multiple CSI-RS resource sets, and
the plurality of groups configured for the configuration of the CSI-RS resource sets are repeated for the configuration of the CSI-RS resource sets.

2. The UE according to claim 1 , wherein the index of at least one CSI-RS resource includes one index associated with a best result among measurement results based on the multiple CSI-RS resources.

3. A radio communication method for a user equipment (UE) comprising:
receiving, by higher layer signaling, information for configuring multiple Channel State Information-Reference Signal (CSI-RS) resource sets; and
for each of the multiple CSI-RS resource sets, measuring multiple CSI-RS resources and reporting, based on the measurement results, an index of at least one CSI-RS resource selected from the multiple CSI-RS resources,
wherein:
a plurality of groups, each including multiple CSI-RS resource sets are transmitted repeatedly,
each of the multiple CSI-RS resource sets is associated with a different beam,
the multiple CSI-RS resources for each of the multiple CSI-RS resource sets are transmitted in different symbols,
the plurality of groups including the multiple CSI-RS resource sets are received repeatedly, and
the plurality of groups configured for the configuration of the CSI-RS resource sets are repeated for the configuration of the CSI-RS resource sets.

4. A base station comprising:
a transmitter that transmits, by higher layer signaling, information for configuring multiple Channel State Information-Reference Signal (CSI-RS) resource sets including multiple CSI-RS resources measured for each of the multiple CSI-RS resource sets; and
a receiver that receives an index of at least one CSI-RS resource selected from the multiple CSI-RS resources, the index being reported based on the measurement results for each of the multiple CSI-RS resource sets,
wherein:
a plurality of groups, each including multiple CSI-RS resource sets are transmitted repeatedly,
each of the multiple CSI-RS resource sets is associated with a different beam,
the multiple CSI-RS resources for each of the multiple CSI-RS resource sets are transmitted in different symbols, and
the plurality of groups configured for the configuration of the CSI-RS resource sets are repeated for the configuration of the CSI-RS resource sets.

5. A system comprising a user equipment (UE) and a base station, wherein the UE comprises:
a first receiver that receives, by higher layer signaling, information for configuring a multiple Channel State Information-Reference Signal (CSI-RS) resource sets; and
a processor that, for each of the multiple CSI-RS resource sets, measures multiple CSI-RS resources and reports, based on the measurement results, an index of at least one CSI-RS resource selected from the multiple CSI-RS resources,
wherein:
a plurality of groups, each including multiple CSI-RS resource sets are transmitted repeatedly,
each of the multiple CSI-RS resource sets is associated with a different beam,
the multiple CSI-RS resources for each of the multiple CSI-RS resource sets are transmitted in different symbols,
the first receiver repeatedly receives the plurality of groups including the multiple CSI-RS resource sets, and
the plurality of groups configured for the configuration of the CSI-RS resource sets are repeated for the configuration of the CSI-RS resource sets, and

the base station comprises:
a transmitter that transmits the information; and
a second receiver that receives the index of at least one CSI-RS resource.

Assignees

• Ntt Docomo Inc
• Docomo Innovations Inc

Inventors

• Kakishima Yuichi
• Na Chongning
• Liu Min
• Nagata Satoshi

Classifications

• H04B7/06952

  Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W16/28

  using beam steering · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title