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Title:
BASE STATION, DIRECTIONAL RECEPTION METHOD AND MEDIUM
Document Type and Number:
WIPO Patent Application WO/2017/208282
Kind Code:
A1
Abstract:
A base station comprises: a plurality of antennas configured to perform directional reception of initial access requests from a plurality of user terminals; a probability function generator configured to generate a probability function for a plurality of regions within a radio coverage area of the base station, the probability function having a peak at a candidate region among the plurality of regions, in which one of the plurality of user terminals has been found in a previous scan; a beam sweep controller configured to scan the plurality of regions in descending order of probabilities given by the probability function for the plurality of regions; and a power comparator configured to compare a received power level from a scanned region with a predetermined threshold value during the scanning by the beam sweep controller, and, if the received power level from the scanned region is greater than the predetermined threshold value, update the candidate region with the scanned region and stop scanning by the beam sweep controller over a remaining part of the plurality of regions.

Inventors:
DILEEP, Kumar (7-1 Shiba 5-chome, Minato-k, Tokyo 01, 〒1088001, JP)
ISHII, Naoto (7-1 Shiba 5-chome, Minato-k, Tokyo 01, 〒1088001, JP)
Application Number:
JP2016/002652
Publication Date:
December 07, 2017
Filing Date:
June 01, 2016
Export Citation:
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Assignee:
NEC CORPORATION (7-1 Shiba 5-chome, Minato-ku Tokyo, 01, 〒1088001, JP)
International Classes:
H04B7/08; H04W8/00; H04W48/16
Domestic Patent References:
WO2013122440A12013-08-22
Foreign References:
US20090005121A12009-01-01
JPH11252614A1999-09-17
Other References:
YINAN QI ET AL: "Coordinated initial access in millimetre wave standalone networks", 2016 IEEE CONFERENCE ON COMPUTER COMMUNICATIONS WORKSHOPS (INFOCOM WKSHPS), IEEE, 10 April 2016 (2016-04-10), pages 59 - 64, XP032957262, DOI: 10.1109/INFCOMW.2016.7562046
GUPTA DIVYA ET AL: "QOS constrained routing algorithm using directional antenna", 2013 TENTH INTERNATIONAL CONFERENCE ON WIRELESS AND OPTICAL COMMUNICATIONS NETWORKS (WOCN), IEEE, 26 July 2013 (2013-07-26), pages 1 - 4, XP032492701, ISSN: 2151-7681, [retrieved on 20130930], DOI: 10.1109/WOCN.2013.6616187
V. DESAI; L. KRZYMIEN; P. SARTORI; W. XIAO; A. SOONG; A. ALKHATEEB: "Initial beamforming for mmWave communications", SIGNALS, SYSTEMS AND COMPUTERS, 2014 48TH ASILOMAR CONFERENCE ON, 2014, pages 1926 - 1930
Attorney, Agent or Firm:
KATO, Asamichi (20-12 Shin-Yokohama 3-chome, Kohoku-ku, Yokohama-sh, Kanagawa 33, 〒2220033, JP)
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