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Communication terminal and radio communication method

A communication terminal and control channel technology, applied in wireless communication, selection device, multiplex communication, etc., can solve problems such as ineffective use of code resources

Inactive Publication Date: 2002-08-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, if the access channel used for control or short message communication is assigned the same spreading code as that of the large-capacity traffic channel, code resources cannot be effectively used

Method used

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  • Communication terminal and radio communication method
  • Communication terminal and radio communication method
  • Communication terminal and radio communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, in a multi-carrier communication system using OFDM (Orthogonal Frequency Division Multiplex: Orthogonal Frequency Division Multiplexing) method, it will be described that an access channel serving as a control channel is allocated to subcarriers fewer than subcarriers of a traffic channel. , the case of accessing a grouped communication terminal device.

[0024] figure 1 A block diagram showing the configuration of a communication terminal device according to Embodiment 1 of the present invention. exist figure 1 In the communication terminal device shown, transmission data is converted into parallel signals in a serial / parallel (S / P) conversion unit 101 , and each parallel signal is output to a modulation unit 102 . Each modulation section 102 performs digital modulation processing on an input signal, and outputs the modulated signal to an IFFT (Inverse Fast Fourier Transform) section 103 .

[0025] On the other hand, the access information is con...

Embodiment 2

[0044] In this embodiment, in a multicarrier communication system using the OFDM scheme, a case will be described in which an access channel serving as a control channel is assigned to a designated subcarrier to access grouped communication terminal devices.

[0045] Figure 4 A block diagram showing the configuration of a communication terminal device according to Embodiment 2 of the present invention. exist Figure 4 In the communication terminal device shown, transmission data is converted into parallel signals in the S / P conversion unit 401 , and each parallel signal is output to the modulation unit 402 . Each modulation section 402 performs digital modulation processing on an input signal, and outputs the modulated signal to the IFFT section 403 .

[0046] The IFFT section 403 performs IFFT transformation on the digitally modulated transmission data, and outputs the IFFT-transformed signal to the D / A conversion section 404 . The D / A converter 404 converts the IFFT-tran...

Embodiment 3

[0065] In this embodiment, in a CDMA (Code Division Multiple Access: Code Division Multiple Access) multi-code communication system, the number of spreading codes assigned to the access channel serving as the control channel is less than that of the traffic channel. , the case of accessing a grouped communication terminal device.

[0066] Figure 7 A block diagram showing the configuration of a communication terminal device according to Embodiment 3 of the present invention. exist Figure 7 In the communication terminal device shown, channel coding (error correction coding, interleaving, and processing of assigning each spreading code) is performed on the transmission data for each channel in the channel coding section 701, and each channel-coded signal is output to the modulation section 702. Each modulation section 702 performs digital modulation processing on an input signal, and outputs the modulated signal to the spectrum spreading section 703 .

[0067] Spreading sec...

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PUM

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Abstract

Spectral efficiency is improved by assigning only a small number of subcarriers to an access channel as compared with a traffic channel to which a large number of subcarriers are assigned. Also, by grouping users and assigning the access channel of each group to an individual subcarrier, the reception band is reduced and processing involved in reception decreased, and power consumption is reduced, thus saving battery power.

Description

technical field [0001] The present invention relates to a communication terminal device and a wireless communication method used in a digital wireless communication system. Background technique [0002] In a cellular mobile radio communication system, radio communication channels within the service area of ​​a base station include a traffic channel for storing traffic data, a control channel for controlling, and the like. [0003] For an access channel that transmits a call from a wireless communication mobile station or transmits control information from a mobile station to a base station, by grouping the mobile stations and assigning different subcarriers as each group, the interference in the access channel can be avoided. transmission conflicts, and a decrease in frequency utilization efficiency can be suppressed. [0004] On the one hand, like multimedia information, with the increase of transmission of voice, image and other information, the ...

Claims

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Application Information

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IPC IPC(8): H04J13/00H04B1/707H04J11/00H04J13/16H04L5/02H04W4/06H04W16/02H04W16/14H04W52/02H04W52/04H04W72/04H04W88/02H04W88/08
CPCH04W4/08H04B1/7115Y02B60/50H04W72/0453H04L5/023H04W52/0219H04W16/14Y02D30/70H04W52/02H04W72/04H04W88/02
Inventor 金本英树加藤修
Owner PANASONIC CORP
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