Base station apparatus and channel allocation method

Abstract

A base station apparatus and a channel allocation method are disclosed. The task of the invention is to improve the frequency using efficiency. A base station (12) includes an array antenna composed of a plurality of antenna elements (20-1 to 20-4), and uses at least one part of the plurality of antenna channels to communicate with the mobile station. The base station (12) comprises: an adaptive control unit for obtaining weights (w1' to w4') of antenna elements (20-1 to 20-4) indicating an arrival direction of an interference signal detected on a radio channel that is not being used for communication, and weights (w1 to w4) indicating an arrival direction of a desired signal arriving from a mobile station. The base station further includes an interference signal suppressibility determining unit (34) for determining, based on the weights (w1 to w4) and the weights (w1' to w4'), whether or not it is possible to form a direction pattern that directs a main beam toward the arrival direction of the desired signal and directs a null toward the arrival direction of the interference signal; and a channel allocation unit (36) for determining, based on a result of the determination, whether to allocate the mobile station the radio channel on which the interference signal is detected.

Description

technical field [0001] The present invention relates to a base station device and a channel allocation method, in particular to a base station device and a channel allocation method for performing adaptive array control. Background technique [0002] Conventionally, a base station is known that includes means for suppressing interference waves that degrade communication quality. [0003] For example, Japanese Unexamined Patent Publication No. 2000-82987 discloses a method of performing interference wave detection (carrier sense) based on a link establishment request (connection request) from a mobile station, and assigning a wireless channel in which an interference wave has not been detected to a mobile station. base station ( Figure 5 , paragraph 0003). Also, the base station disclosed in Patent Document 1 includes an array antenna, and by orienting nulls in the antenna pattern in the direction of arrival of the interference wave, it is also possible to suppress the inte...

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Problems solved by technology

[0008] However, no matter whether the existing base station can suppress the interference wave through the directional control of the array antenna, it only allocates wireless channels for which the interference wave is not detected (or the interference wave level (level) does not reach the specified value) in the carrier sense. mobile station (see Figure 10 )

Therefore, even if the interference wave can be suppressed, there are wireless channels that are not used for communication only because the interference wave is detected, and there is a problem in frequency utilization efficiency.

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