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Fixed null-steering beamforming method

A technology of fixed beam and zero adjustment, which is applied in the field of computer program products, can solve the problems of reducing sensitivity and achieve the effect of low channel interference

Inactive Publication Date: 2009-09-30
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When receiving a signal, beamforming increases receiver sensitivity in the direction of the desired signal and reduces sensitivity in the direction of interference and noise

Method used

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Examples

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Embodiment Construction

[0027] figure 1 A method 100 of fixedly nulled beamforming in a base station is shown, comprising a first step 101 in which the maximum number M of beams in a cell is calculated max . This calculation is primarily dependent on the number of antennas the base station is using to transmit to wireless terminals within the cell and to the sector angle coverage within the cell. Maximum number of beams M max Indicates an upper bound on the possible beams that can be allocated within a cell. In a second step 102, the traffic volume of the base station is measured and compared with a first threshold E1. The traffic represents all communications between the base station and all wireless terminals within the cell covered by the base station. If the traffic volume is less than the first threshold E1, the standard reuse-3 system is used and no fixed orthogonal beams are formed in the cell. Otherwise, if the traffic volume is greater than the first threshold, then in the third step 10...

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Abstract

The invention relates to a fixed null-steering beamforming method. Particularly, the invention relates to a frequency reuse method in a base station of a Frequency Division Multiplexing Access wireless communication system, the wireless communication system comprising at least the base station adapted for covering a cell, at least one wireless terminal coupled to the base station, the method comprising the steps of: calculating a maximum number of beams per cell by obtaining a number of antennas of the base station; initiating a fixed null-steering beamforming by setting a number of orthogonal fixed beams to a first constant on a portion of the cell, if a traffic of the base station is bigger than a first threshold; obtaining an absolute or an approximate location of the wireless terminal within the cell; scheduling the wireless terminal to fixed null-steering resources, if the absolute or approximate location of the wireless terminal is within the beam zone of the cell; setting the number of orthogonal fixed beams to a second constant of the fixed null-steering beamforming, if the traffic is bigger than a second threshold.

Description

technical field [0001] The invention relates to a method of fixed null-steering beamforming in a base station and to a computer program product. Background technique [0002] In a wireless communication system, frequency resources allocated to services can be reused in a regular pattern of areas (called cells) covered by one base station. In mobile radio communication systems, these cells are usually hexagonal. To ensure that mutual interference between wireless terminals is kept low, adjacent cells use different frequencies. In fact, a set of N different frequencies is used for each cluster of N neighboring cells. Cluster patterns and corresponding frequencies are reused in regular patterns across the service area. [0003] The closest distance between the centers of two cells using the same frequency in different clusters is determined by the cluster size N and the cell cluster layout. This distance is called the frequency reuse distance. [0004] The signal processin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/02H04W88/08
CPCH04B7/0617H04W16/28H04W72/048H04W64/00H04W72/51
Inventor 陈晔健
Owner ALCATEL LUCENT SAS
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