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Base station apparatus and packet transmitting method

A technology of base station and packet transmission, applied in the directions of space transmit diversity, polarization/direction diversity, diversity/multi-antenna system, etc., capable of solving undisclosed problems such as high-speed packet transmission

Inactive Publication Date: 2002-11-20
GK BRIDGE 1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, until now, in a wireless communication system using adaptive array CDMA, there has not been disclosed a method for efficiently performing downlink high-speed packet transmission

Method used

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  • Base station apparatus and packet transmitting method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0021] Fig. 2 is a block diagram showing the configuration of base station apparatus 100 according to Embodiment 1 of the present invention.

[0022] In FIG. 2 , the base station apparatus 100 includes: antenna elements 101 to 103 constituting an array antenna; a duplexer 104; an AAA (Adaptive Array Antenna) reception control unit 105; a demodulation unit 106; a priority determination unit 107; The sending destination determining unit 108 . The base station apparatus 100 further includes: a data selection unit 151 ; a modulation scheme determination unit 152 ; a modulation unit 153 ; an AAA transmission control unit 154 ; and adders 155 to 157 corresponding to the antenna elements 101 to 103 .

[0023] The duplexer 104 performs frequency conversion processing and amplification processing on the signals received by the antenna elements 101 to 103 , and outputs them to the AAA reception control unit 105 . Then, the duplexer 104 performs frequency conversion processing and ampli...

Embodiment 2

[0043] In Embodiment 2, a case will be described in which communication terminal apparatuses are divided into several groups based on the positional relationship, and the transmission is performed with directivity in each group. The method of forming directivity in each group is described in detail in Japanese Patent Application No. 2000-008364 (Japanese Patent).

[0044] FIG. 5 is a block diagram showing the configuration of base station apparatus 300 of this embodiment. In the base station apparatus 300 shown in FIG. 5, the same components as those of the base station apparatus 100 shown in FIG. 2 are denoted by the same reference numerals as in FIG. 2, and description thereof will be omitted.

[0045] The operation of the AAA reception control unit 301 of the base station apparatus 300 shown in FIG. 5 is different from that of the AAA reception control unit 105 of the base station apparatus 100. different.

[0046] The AAA reception control unit 301 prepares the number of...

Embodiment 3

[0052] Here, high-speed modulation schemes such as 16QAM and 64QAM need to be transmitted with high power in order to obtain the same level of reception quality as low-speed modulation schemes such as QPSK. Therefore, when transmitting with a high-speed modulation method, interference with surrounding communication terminal devices increases.

[0053] On the other hand, the adaptive array can control the directional width, and if the directional width is narrowed, it is possible to reduce interference to surrounding communication terminal devices.

[0054] For example, as shown in FIG. 7, when the base station apparatus 400 transmits a signal to a communication terminal apparatus (MS) 201 existing in an area with a high density, if the directivity width is narrowed, it is possible to reduce the impact on surrounding communication terminal apparatuses. generated interference. Conversely, when a signal is transmitted to a communication terminal device (MS) 209 existing in a low...

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PUM

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Abstract

The priority determination unit 107 determines the priority of each communication terminal apparatus based on the information indicating the channel quality of the downlink. The transmission destination determination unit 108 estimates the direction of presence of each communication terminal device based on the information indicating the direction of arrival of the signal, and determines the communication terminal device for downlink high-speed packet transmission based on the direction of presence and priority of each communication terminal device. The AAA transmission control unit 154 calculates a transmission weight based on the direction of arrival of the signal transmitted from the communication terminal device determined by the transmission destination determination unit 108 . Then, the AAA transmission control unit 154 multiplies the signals transmitted from the respective antenna elements 101 to 103 by respective transmission weights. Thus, in the case of using an adaptive array, downlink high-speed packet transmission can be efficiently performed.

Description

[0001] Technical Field The present invention relates to a base station apparatus and a packet transmission method used in a CDMA radio communication system. Background technique [0002] In the CDMA wireless communication system, it is proposed to use channels such as DSCH (Down link Shared CHannel: Downlink Shared Channel) for each user in order for the base station (BS) to load a large amount of data into the communication terminal (TS) in a short period of time. To perform downlink high-speed packet transmission. Hereinafter, this method will be described using FIG. 1 . FIG. 1 is a diagram showing the configuration of a conventional radio communication system. [0003] In FIG. 1 , base station apparatus 11 is performing two-way wireless communication with communication terminal apparatuses 21 to 23 using a communication channel (DPCH). In this case, each communication terminal apparatus 21 to 23 transmits information indicating th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
CPCH04B7/0408H04B7/0615H04B7/10
Inventor 青山高久三好宪一上丰树
Owner GK BRIDGE 1
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