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Radio base station and communication control method

A radio base station and radio signal technology, applied in wireless communication, radio transmission system, multiplex communication, etc., can solve problems such as inability to calculate antenna weights

Inactive Publication Date: 2013-03-20
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, when an uplink radio signal is received from the radio terminal UE, the radio base station eNB may not be able to calculate the antenna weight for the downlink radio signal whose frequency band is equal to that of the uplink radio signal based on the propagation environment of the frequency band used for the uplink radio signal

Method used

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  • Radio base station and communication control method
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  • Radio base station and communication control method

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no. 1 approach ）

[0038] Next, a first embodiment will be described with reference to the drawings. Specifically, (1.1) Configuration of radio communication system, (1.2) Operation of radio communication system, and (1.3) Operation and effect will be described. It should be noted that in the following embodiments, the same or similar reference numerals are applied to the same or similar parts throughout the drawings.

[0039] (1.1) Structure of radio communication system

[0040] First, the radio communication system according to the first embodiment will be described in the order of (1.1.1) Overall Schematic Configuration of Radio Communication System, (1.1.2) Configuration of Radio Base Station, and (1.1.3) Configuration of Radio Terminal structure.

[0041] (1.1.1) The overall schematic structure of the radio communication system

[0042] figure 1 is an overall schematic configuration diagram of the radio communication system 10 according to the first embodiment.

[0043] figure 1 The ...

no. 2 approach ）

[0103] Next, a second embodiment will be described with reference to the drawings. Specifically, (2.1) Configuration of Radio Communication System, (2.2) Operation of Radio Communication System, and (2.3) Operation and Effect will be described. It should be noted that in the following embodiments, the same or similar reference numerals are applied to the same or similar parts throughout the drawings.

[0104] (2.1) Construction of radio communication system

[0105] First, the configuration of the radio communication system according to the second embodiment will be described in the order of (2.1.1) Overall Schematic Configuration of Radio Communication System, (2.1.2) Configuration of Radio Base Station, (2.1.3) Configuration of Radio Terminal .

[0106] (2.1.1) The overall schematic structure of the radio communication system

[0107] Figure 7 is an overall schematic configuration diagram of the radio communication system 10 according to the second embodiment.

[0108]...

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Abstract

A radio base station (eNB1), when having received an upstream radio signal of a radio frequency band from a radio terminal (UE2), calculates, based on a demodulation reference signal included in the upstream radio signal, and stores reception weights of antennas (108A to 108D). The radio base station (eNB1) further sets, as the transmission weight of each of the antennas (108A to 108D), that one of the stored reception weights of the antennas (108A to 108D) which was calculated during a past given interval and which corresponds to a frequency band that is the nearest to the frequency band of a PDSCH that is a target for setting.

Description

technical field [0001] The present invention relates to a radio base station that transmits and receives radio signals to and from a radio terminal using a plurality of antennas, and a communication control method in the radio base station. Background technique [0002] In 3GPP (Third Generation Partnership Project), according to a radio communication system corresponding to LTE (Long Term Evolution) having a standard currently being designed, in radio communication between a radio base station eNB and a radio terminal UE, the radio base station eNB performs allocation of radio resources (for example, refer to Non-Patent Document 1). Also, in the radio communication system corresponding to LTE, one of FDD (Frequency Division Duplex) and TDD (Time Division Duplex) is utilized in radio communication between the radio base station eNB and the radio terminal UE. [0003] Furthermore, in the LTE (TDD-LTE) radio communication system utilizing TDD, the feature has been discussed t...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/04H04J1/00H04J11/00H04J99/00
CPCH04W72/0446H04B7/0842H04B7/0615H04W72/0453H04L25/03159Y02D30/70
Inventor 佐原徹
Owner KYOCERA CORP