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Mobile communication device, base station device, wireless control method, and mobile communication system

A technology of a mobile communication device and a mobile communication system, which is applied in the directions of radio transmission systems, diversity/multi-antenna systems, transmission systems, etc., can solve the problems of deterioration of received signal characteristics, difficult demodulation processing, deterioration of communication quality, etc., so as to suppress communication The effect of quality deterioration

Active Publication Date: 2010-12-29
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this Rayleigh fading, the phase and amplitude of the received signal fluctuate greatly
In addition, when the signal amplitude during reception is greatly reduced due to such a fluctuation, there is a problem that the characteristics of the received signal of the mobile communication device are greatly deteriorated, making it difficult to perform demodulation processing.
As a result, there is a problem that the control corresponding to the latest signal quality of the transmission antenna cannot be performed, and the throughput is lowered, resulting in deterioration of the characteristics of the system.
That is, there is a problem that optimal resource allocation and AMC cannot be realized, and communication quality deteriorates.

Method used

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  • Mobile communication device, base station device, wireless control method, and mobile communication system
  • Mobile communication device, base station device, wireless control method, and mobile communication system
  • Mobile communication device, base station device, wireless control method, and mobile communication system

Examples

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no. 1 Embodiment approach

[0062] figure 1 It is a diagram showing the network configuration of the mobile communication system 100a (first embodiment). The mobile communication system 100a includes a mobile communication device 10a having a plurality of antennas, and a base station device 20a. The mobile communication device 10a performs wireless communication with the base station device 20a. In addition, the mobile communication device 10a performs wireless communication with another mobile communication device via the base station device 20a.

[0063] The mobile communication device 10a has a plurality of antennas. The mobile communication device 10a transmits a reference signal to the base station device 20a using the transmission antenna and the standby antenna. In particular, the reference signal transmitted using the standby antenna is transmitted in order to determine which antenna is appropriate to use in base station device 20a for wireless communication with mobile communication device 1...

no. 2 Embodiment approach

[0106] In the first embodiment described above, a plurality of patterns are prepared in advance for reference signal transmission by the standby antenna, and one of the patterns is selected to determine the transmission timing of the reference signal. On the other hand, in the second embodiment, whether or not to transmit a reference signal from the standby antenna is judged at a predetermined cycle, and based on the judgment, the transmission timing of the reference signal is determined. Hereinafter, the mobile communication system 100b of the second embodiment will be described. In addition, due to the network structure of the mobile communication system 100b and figure 1 The illustrated mobile communication system 100a is the same, so its description is omitted.

[0107] A mobile communication system 100b (second embodiment) includes a mobile communication device 10b and a base station device 20b. The mobile communication device 10b differs from the mobile communication ...

no. 3 Embodiment approach

[0127] In the first embodiment described above, each time the first mode or the second mode is selected, transmission and reception of a signal (for example, a mode request signal or a mode selection signal) dedicated to the transmission timing control of the reference signal of the standby antenna occurs. deal with. On the other hand, by using a mode switching trigger in the mobile communication system 100c (third embodiment), mode switching can be performed without requiring transmission and reception of signals controlled in accordance with transmission timing of reference signals dedicated to standby antennas. Hereinafter, a mobile communication system 100c according to the third embodiment will be described. In addition, since the network structure of the mobile communication system 100c and figure 1 The illustrated mobile communication system 100c is the same, so its description is omitted.

[0128] The mobile communication system 100c includes a mobile communication ...

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Abstract

Disclosed is a mobile communication device that is equipped with a plurality of antennas for sending and receiving wireless signals and with a baseband processor, which selects from a plurality of antennas a transmission antenna to use to transmit a data signal based on instructions by a base station device, and transmits a data signal using said transmission antenna, wherein the baseband processor determines the timing to send a reference signal using an idle antenna that is not being used to transmit a data signal, based on the possibility that the transmitting antenna will be switched, and sends a reference signal based on the determined timing.

Description

technical field [0001] The present invention relates to a mobile communication device, a base station device, a wireless control method and a mobile communication system. [0002] this application claims priority based on Japanese Patent Application No. 2008-025401 for which it applied to Japan on February 5, 2008, and uses the content here. Background technique [0003] When a mobile communication device receives a transmission signal from a base station device, Rayleigh fading (Rayleigh fading) occurs due to a change in the relative position between the base station device and the mobile communication device. Due to the occurrence of this Rayleigh fading, the phase and amplitude of the received signal greatly fluctuate. Furthermore, when the signal amplitude during reception is greatly reduced due to such a fluctuation, there is a problem that the characteristics of the received signal of the mobile communication device are greatly degraded, making it difficult to perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/10H04B7/06H04W88/02
CPCH04W64/006H04B7/061H04L5/0023H04B7/0684H04L5/0048H04L5/0078
Inventor 高木佑介彦惣桂二坂本充下锅忠大岛章
Owner SHARP KK
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