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Mobile station device and transmission antenna selection method in the mobile station device

A technology for transmitting antennas and mobile stations, which is applied to communication between multiple stations, diversity/multi-antenna systems, space transmit diversity and other directions, and can solve problems such as increased transmit power, reduced communication system capacity, and large adjacent cell interference. , to achieve the effect of reducing interference and increasing capacity

Inactive Publication Date: 2007-03-07
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when the transmission power control is performed on the uplink, the transmission power of the high-speed packet transmitted from the mobile station increases, and the interference to the adjacent cell becomes very large, thereby reducing the capacity of the communication system as a whole.

Method used

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  • Mobile station device and transmission antenna selection method in the mobile station device
  • Mobile station device and transmission antenna selection method in the mobile station device
  • Mobile station device and transmission antenna selection method in the mobile station device

Examples

Experimental program
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Effect test

Embodiment approach 1

[0027] FIG. 1 is a configuration diagram of a mobile communication system according to Embodiment 1 of the present invention. The mobile communication system includes a mobile station, a base station 1 and a base station 2, and the communication between the mobile station and each base station is performed through TDD. Mobile station 1 has two antennas, and base station 1 and base station 2 each have one antenna. At present, the mobile station receives downlink signals through both antenna 1 and antenna 2, and transmits uplink signals from one of antenna 1 and antenna 2. Also, the mobile station is currently accommodated in the cell of the base station 1, the mobile station is currently communicating and the transmission destination of the uplink signal from the mobile station is the base station 1. Also, the base station 2 is a base station of a cell adjacent to the cell of the base station 1 . In this embodiment, the mobile station selects an antenna that causes less inter...

Embodiment approach 2

[0040] In this embodiment, a case where a mobile station performs transmission power control on an uplink signal will be described.

[0041] In Embodiment 1 described above, an antenna having the smallest received power of a pilot signal transmitted from the base station 2 of the adjacent cell is selected as the transmission antenna for the uplink signal. According to such a selection process, it is certainly possible to select an antenna that causes the least interference to adjacent cells as a transmission antenna. However, since the propagation path state with the base station 1 is not taken into consideration in the selection of the antenna, the reception quality required for the uplink signal at the base station 1 may not be satisfied depending on the propagation path state. Therefore, in this embodiment, the transmission power of the uplink signal is controlled to meet the required reception quality of the uplink signal at the base station 1, and the transmission antenna...

Embodiment approach 3

[0070] In this embodiment, a case where the base station 1 and the base station 2 have a plurality of antennas will be described.

[0071] FIG. 5 is a configuration diagram of a mobile communication system according to Embodiment 3 of the present invention. This mobile communication system differs from Embodiment 1 in the following points. That is, base station 1 and base station 2 each have two antennas, and base station 1 and base station 2 transmit downlink signals to mobile stations from both antennas 1 and 2 . In Figure 5, r ijk Indicates a downlink signal transmitted from antenna j of base station i and received by antenna k of the mobile station. For example, r 121 Indicates a downlink signal transmitted from the antenna 2 of the base station 1 and received by the antenna 1 of the mobile station.

[0072] When a base station has a plurality of antennas, it is necessary to consider that the base station performs maximum-ratio combining of uplink signals between the a...

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Abstract

There is provided a mobile station device capable of increasing the communication system capacity when performing a high-speed packet transmission of an uplink line. The mobile station has a plurality of antennas: antenna 1 and antenna 2. Among the signals received from a base station 2 of the adjacent cell, the mobile station compares a reception power of signal r21 received by the antenna 1 to a reception power of signal r22 received by the antenna 2. When ''the reception power r21 < THE RECEPTION OF R22'', the antenna 1 is selected as a transmission antenna. When ''the reception power r21 >= the reception of r22'', the antenna 2 is selected as a transmission antenna. The uplink line signal is transmitted from the selected antenna to the base station 1, thereby reducing interference given to the base station 2 of the adjacent cell.

Description

technical field [0001] The present invention relates to a mobile station device and a transmission antenna selection method in the mobile station device. Background technique [0002] In the TDD scheme of the mobile communication system, each frame is divided into an uplink frame (transmission frame of the mobile station, reception frame of the base station) and a downlink frame (reception frame of the mobile station, transmission frame of the base station). Furthermore, in the TDD scheme, since the uplink signal and the downlink signal are communicated on the same frequency band, the propagation paths of the uplink signal and the downlink signal are the same. A technique of performing antenna selection transmit diversity using the properties of the TDD system has been proposed, in which at a base station having 2 antennas, the reception power of the uplink signal is larger from the antenna (that is, the propagation path An antenna with a better state) transmits a downlink ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/08H04B7/06
CPCH04B7/082H04B7/0868H04B7/0608
Inventor 西尾昭彦三好宪一
Owner PANASONIC CORP