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User equipment and base station

專利號(hào)
US10009905B2
公開日期
2018-06-26
申請人
NTT DOCOMO, INC.（JP Tokyo）
發(fā)明人
Yuichi Kakishima; Satoshi Nagata; Yoshihisa Kishiyama
IPC分類
G01R31/08; H04J3/00; H04W72/08; H04W76/14; H04W16/28; H04B7/024; H04B7/0408; H04B7/06; H04B7/0413; H04L5/00; H04W24/08; H04W76/02
技術(shù)領(lǐng)域
station,camped,200b,base,200a,beam,equipment,reception,user,adjacent
地域： Tokyo

摘要

The present disclosure relates to techniques for reducing flash light effect in 3D MIMO. One aspect of the present invention relates to user equipment, comprising: a transmission and reception unit configured to receive an interference beam candidate list including directional beams transmitted from a camped base station and interference beam candidates transmitted from an adjacent base station; a measurement unit configured to measure reception quality of reference signals transmitted in the respective directional beams in the received interference beam candidate list; and an interference information generation unit configured to generate interference information based on the measured reception quality, wherein the transmission and reception unit indicates the generated interference information to the camped base station or the adjacent base station.

說明書

TECHNICAL FIELD

The present invention relates to a radio communication system.

BACKGROUND ART

In Releases 8-11 of 3GPP (Third Generation Partnership Project), techniques for forming beams in the horizontal direction at a base station having multiple horizontally arranged antenna ports are employed. Also in Release 12, in order to further improve system characteristics, beam forming techniques (3D MIMO (Multiple-Input Multiple-Output)) are being discussed by using multiple arbitrarily arranged antenna ports where the horizontal arrangement is more generalized. For example, techniques for forming beams not only in the horizontal direction but also in the vertical direction at a base station having multiple antenna ports two-dimensionally arranged in the horizontal and vertical directions are being discussed.

In the 3D MIMO with such arbitrarily arranged antenna ports, a base station uses multiple antenna ports arranged in a predetermined beam arrangement to form directional beams in the horizontal and vertical directions. As illustrated in FIG. 1, the base station transmits directional beams, that is, precoded signals from the respective antenna ports. In the illustrated example, the base station transmits precoded CSI-RSs (Channel State Information-Reference Signals) for reception quality measurement at user equipment as the precoded signals. The user equipment measures reception quality of the precoded CSI-RSs transmitted from the respective antenna ports, selects a directional beam having good reception quality (for example, a directional beam having the maximum reception power) based on the measured reception quality and feeds a beam index of the selected directional beam back to the base station.

權(quán)利要求

1
The invention claimed is:1. User equipment, comprising:a receiver that receives an interference beam candidate list including directional beams transmitted from a camped base station and interference beam candidates transmitted from an adjacent base station; anda processor that:measures reception quality of reference signals transmitted in the respective directional beams in the received interference beam candidate list; andgenerates interference information based on the measured reception quality; anda transmitter that transmits the generated interference information to the camped base station or the adjacent base station.2. The user equipment as claimed in claim 1, wherein the transmitter transmits the interference information to the camped base station by multiplexing the interference information into channel state information or acknowledgement.3. The user equipment as claimed in claim 1, wherein the transmitter transmits the interference information to the camped base station by multiplexing the interference information into an uplink data channel.4. The user equipment as claimed in claim 1, wherein the transmitter transmits the interference information to the adjacent base station in a random access channel.5. The user equipment as claimed in claim 1, wherein the transmitter transmits the interference information to the adjacent base station via a D2D (Device to Device) signal for transmission to user equipment camped in the adjacent base station.6. The user equipment as claimed in claim 5, wherein the processor includes one or more of a timing, a frequency position, a beam index and reception quality of incurred interference in a payload of the D2D signal.7. The user equipment as claimed in claim 1, wherein the respective directional beams in the interference beam candidate list are associated with indicators indicative of transmitter of the directional beams, and in response to an interference level of a reference signal transmitted in a directional beam from the adjacent base station being higher than or equal to a predetermined threshold, the transmitter transmits the generated interference information to the camped base station or the adjacent base station.8. A base station camped in by user equipment, comprising:a transmitter that transmits an interference beam candidate list including directional beams transmitted from the base station and interference beam candidates transmitted from an adjacent base station to the user equipment and transmits reference signals in directional beams in the interference beam candidate list; anda processor that: acquires interference information from the user equipment; andcontrols transmission to the user equipment in cooperation with the adjacent base station based on the acquired interference information.9. The base station as claimed in claim 8, wherein the processor controls transmission to the user equipment such that a transmission timing of an interference beam from the adjacent base station indicated in the interference information does not overlap with a transmission timing of each of the directional beams.10. The base station as claimed in claim 8, wherein the transmitter transmits a signal that causes the adjacent base station to refrain from transmitting an interference beam of the adjacent base station indicated in the interference information at an indicated timing or period.
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