Apparatus and method for beam-forming communication in mobile wireless backhaul network

An apparatus for beam-forming communication in a mobile wireless backhaul network included in a mobile terminal in a high speed moving body that moves at high speed, the apparatus comprising:

• a position searching unit determining a distance between a base station and the mobile terminal, a relative speed between the base station and the mobile terminal, and a relative direction of the base station;
• a beam setting unit
• determining a plurality of beam search groups including searching beams of the mobile terminal according to the distance, wherein the searching beams are beams to be searched by the base station,
• determining a number of antenna elements forming the searching beams, wherein the antenna elements are included in each of the plurality of beam search groups, and
• setting a number of the searching beams and a search period for a beam of the base station according to the relative speed and the relative direction;
• and
• a beam searching unit searching for the beam of the base station based on the search period using the plurality of beam search groups,
• wherein the antenna elements are included in a phased-array antenna, and the number of first beam search groups among the plurality of beam search groups are selected more than the number of second beam search groups among the plurality of beam search groups,
• wherein the first beam search groups are the beam search groups in the same direction as the relative direction of the base station, and the second beam search groups are the beam search groups in a direction opposite to the relative direction of the base station.

A method for beam-forming communication in a mobile wireless backhaul network, the method comprising:

• determining a distance between a base station and a mobile terminal, a relative speed between the base station and the mobile terminal, and a relative direction of the mobile terminal;
• determining a plurality of beam search groups including searching beams of the base station according to the distance, wherein the searching beams are beams to be searched by the mobile terminal, determining a number of antenna elements forming the searching beams, wherein the antenna elements are included in each of the plurality of beam search groups, and setting a number of the searching beams and a search period for a beam of the mobile terminal according to the relative speed and the relative direction;
• and
• performing beam search of the mobile terminal based on the search period using the plurality of beam search groups,
• wherein the antenna elements are included in a phased-array antenna,
• wherein the determining selects the number of first beam search groups among the plurality of beam search groups more than the number of second beam search groups among the plurality of beam search groups,
• wherein the first beam search groups are the beam search groups in the same direction as the relative direction of the mobile terminal, and the second beam search groups are the beam search groups in a direction opposite to the relative direction of the mobile terminal.