Method for selecting beams during initial synchronization process using switched beam, switched beam operation method and initial synchronization using the same
First Claim
1. A method for selecting beams during an initial synchronization process using a switched beam in a radio communications system, the method comprising:
- dividing each cell into sectors;
counting the number of fixed beams per cell, wherein the fixed beams have identical numbers in all cells;
selecting, for each sector, a sequence of switched beams from the fixed beams within that sector,wherein the sequence of switched beams is calculated based on the number of fixed beams, sector numbers, frame numbers, the number of times of transmission of preamble in one frame, distances between the selected switched beams and selected switched beams of adjacent cells, and the number of beams to be selected in each time slot.
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Abstract
A method for selecting beams, a switched beam operation method during an initial synchronization process, and an initial synchronization method using it are provided for selecting beams to minimize the probability of occurrence of interferences between cells by considering a distance between beams within neighboring sectors during an initial synchronization process using switched beams, in an orthogonal frequency division multiplexing (OFDM) cellular system employing a smart antenna. The inventive method comprises the steps of dividing each cell into sectors, and counting the number of fixed beams per cell, and selecting a switched beam for minimizing probability of interference, from fixed beams presenting in a corresponding sector, based on distances between a selected beam and beams of all of adjacent cells and the number of cases to be selected in a subsequent time slot, according to the counted number of the fixed beams existing in each sector.
17 Citations
14 Claims
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1. A method for selecting beams during an initial synchronization process using a switched beam in a radio communications system, the method comprising:
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dividing each cell into sectors; counting the number of fixed beams per cell, wherein the fixed beams have identical numbers in all cells; selecting, for each sector, a sequence of switched beams from the fixed beams within that sector, wherein the sequence of switched beams is calculated based on the number of fixed beams, sector numbers, frame numbers, the number of times of transmission of preamble in one frame, distances between the selected switched beams and selected switched beams of adjacent cells, and the number of beams to be selected in each time slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification