JP2004229087A - Portable terminal unit and error data resending method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal unit which prevents a decrease in a data transmission rate of respective channels when radio communication is executed using a plurality of channels simultaneously. <P>SOLUTION: The portable terminal unit comprises a radio section 201 and a modulation/demodulation section 202, which execute radio communication using a frequency in 5 GHz band; a radio section 203 and a modulation/demodulation section 204, which execute radio communication using a frequency in 800 MHz band; and a terminal control unit 207 which executes control to assign either of the radio frequency bands of 5 GHz and 800 MHz to a first channel while assigning the other of radio frequency band to a second channel, and executes simultaneous communication using both two channels. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mobile terminal device such as a mobile phone that performs wireless communication by simultaneously using a plurality of channels, and an error data retransmission method.
[0002]
[Prior art]
2. Description of the Related Art In a mobile terminal device such as a mobile phone that transmits and receives data by wireless communication, when data is transmitted and received to and from a wireless base station (hereinafter simply referred to as a base station), an error occurs depending on the quality of the wireless communication line. Usually, an error correction code is provided in communication data to correct this error. In addition, when an error occurs, high-quality data is received by reacquiring data in response to a retransmission request. However, there is a problem that the transmission rate decreases during retransmission.
[0003]
For this reason, when a mobile station transmits a transmission request to a base station, the base station allocates all time slots available at that time as communication channels, thereby achieving an increase in transmission efficiency (for example, And Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2002-186016
[Problems to be solved by the invention]
However, if all available time slots are allocated to a specific mobile station as in the above-described conventional example, other mobile stations cannot start communication with the base station later. Further, in the case of the code division multiple access (CDMA) system, as the number of connected terminals increases, the line capacity itself that can be allocated to the terminals decreases. For example, when the maximum number of connected base stations is two, the data transmission rate per channel is reduced to と き に は when two are connected at the same time as compared to when only one is connected. Therefore, in the above-mentioned conventional portable terminal device, two channels of two channels are used, and one channel is dedicated to retransmission, so that the actual data transmission rate is reduced to 1/4. As a result, problems such as an increase in communication time occur. This problem is the same when transmitting and receiving data by packet communication. Normally, one data transmission frame can be transmitted by one packet, but the number of packets required to transmit the one frame increases.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a portable communication device capable of preventing a reduction in the data transmission rate of each channel when performing wireless communication using a plurality of channels simultaneously. It is to provide a terminal device.
[0007]
Another object of the present invention is to provide a method for retransmitting error data in the portable terminal device.
[0008]
[Means for Solving the Problems]
In order to solve the above problem, the portable terminal device according to claim 1 includes a plurality of wireless communication units that wirelessly communicate using frequencies of different radio frequency bands, and the radio frequency bands are assigned to different channels. Terminal control means for controlling the allocation and simultaneous communication using at least two or more of the channels.
[0009]
3. The mobile terminal device according to claim 2, wherein a plurality of wireless communication means for performing wireless communication using frequencies of different radio frequency bands, and each of the radio frequency bands is assigned to a different channel, and at least two or more communication methods are used. And a terminal control means for performing control for simultaneously communicating using the terminal.
[0010]
According to a third aspect of the present invention, in the portable terminal device, the terminal control means uses one of the channels exclusively for retransmission.
[0011]
5. The mobile terminal device according to claim 4, wherein the terminal control means switches between using each channel as a main channel or using a respective channel as a subchannel based on the communication quality of each channel. And
[0012]
An error data retransmission method according to claim 5, wherein a plurality of radio frequency bands are allocated to different channels, a radio communication is performed simultaneously using at least two or more of the channels, And retransmitting the received data using wireless communication.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, as specific examples of the mobile terminal device, two bands of 5 GHz and 800 MHz are used as a radio frequency band used when performing radio communication with a radio base station (hereinafter, simply referred to as a base station). The following describes a mobile phone to be used.
[0014]
1 and 2 are diagrams showing an example of a connection configuration between a mobile phone and a base station according to the present embodiment.
First, FIG. 1 will be described. The base station 1 uses a radio frequency band of 5 GHz and provides a service area 100. The base station 2 uses a radio frequency band of 800 MHz and provides a service area 101. The base station 1 and the base station 2 are synchronized by a GPS clock.
[0015]
The terminal 3 is the mobile phone according to the present embodiment. The terminal 3 is a terminal for dual communication capable of supporting two radio frequency bands of 5 GHz and 800 MHz, and simultaneously communicates with the base station 1 and the base station 2 at different frequencies (5 GHz band and 800 MHz band). can do. However, in this case, the terminal 3 needs to exist in the service areas 100 and 101 of both the base stations 1 and 2.
[0016]
On the other hand, in FIG. 2, the base station 4 is a base station for dual communication capable of supporting two radio frequency bands of 5 GHz and 800 MHz. In this case, the terminal 3 can simultaneously communicate with the base station 4 at different frequencies (a frequency in the 5 GHz band and a frequency in the 800 MHz band) as long as the terminal 3 is within the service area of the base station 4. .
[0017]
FIG. 3 is a block diagram illustrating a configuration of the mobile phone (terminal 3) according to the present embodiment. In FIG. 3, a radio unit 201 has an antenna and wirelessly communicates with a base station using a radio frequency in a 5 GHz band. The modulation and demodulation unit 202 performs modulation and demodulation in the 5 GHz band. The wireless unit 203 has an antenna and wirelessly communicates with a base station using an 800 MHz band wireless frequency. The modulation and demodulation unit 204 performs modulation and demodulation in the 800 MHz band.
[0018]
The operation unit 205 includes various input keys such as numeric keys. The display unit 206 includes a liquid crystal display panel and a display control circuit. The terminal control unit 207 controls each unit of the circuit. For example, communication control such as channel assignment is performed. The error detection / processing unit 208 detects an error in data received from the wireless units 201 and 203 of the two systems. The data execution unit 209 processes the received data. For example, interpolation processing is performed on a portion of the received data that has been lost due to an error.
[0019]
Next, the operation of the mobile phone shown in FIG. 3 relating to data reception will be described with reference to FIGS. FIG. 4 is a flowchart illustrating a flow of a reception control process performed by the terminal control unit 207 of the mobile phone illustrated in FIG. FIG. 5 is a conceptual diagram showing a flow of data interpolation processing performed by the mobile phone shown in FIG. In FIG. 5, the processes corresponding to the steps in FIG. 4 are denoted by the same reference numerals.
[0020]
A mobile phone normally transmits and receives data to and from a base station using a 5 GHz band. 4 and 5, upon receiving data in the 5 GHz band, the mobile phone detects the presence or absence of an error and temporarily stores the received data in a buffer (steps S1 to S3). Here, when an error is detected, a request for retransmission of data at the location of the error is transmitted to the base station in the 800 MHz band (step S6). Next, the retransmission data is received from the base station using the 800 MHz band (step S7).
[0021]
Next, based on the retransmission data received in step S7, the missing data among the received data buffered in step S3 is interpolated (step S4). Next, the data after the interpolation is output (step S5).
[0022]
As described above, according to the present embodiment, different radio frequency bands are used for a communication channel (main channel) for normal data transmission / reception and a channel (sub-channel) dedicated to retransmission, so that the data transmission rate of each channel is different. Can be secured.
[0023]
In this embodiment, since one of the radio frequency bands is dedicated to retransmission, the effect of reducing power consumption is obtained as compared with a case where all two channels are used for normal data communication. Also, the data arrangement can be simplified.
[0024]
In the above-described embodiment, the mobile phone may appropriately switch the channel of higher quality to the communication channel (main channel) based on the communication quality of each channel. Thereby, even when the communication quality of one of the radio frequency bands is poor, the communication quality can be kept good.
[0025]
Alternatively, three or more radio frequency bands may be allocated to different channels, and two or more channels may be used for simultaneous wireless communication.
Further, communication between channels allocated to two different frequency bands may be performed by different communication systems such as a CDMA system and a TDMA system.
[0026]
As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes a design change or the like without departing from the gist of the present invention.
[0027]
【The invention's effect】
As described above, according to the present invention, since different radio frequency bands are used for each channel, it is possible to prevent a decrease in the data transmission rate of each channel when performing radio communication using a plurality of channels simultaneously. Can be.
[0028]
Further, since one of the channels is used exclusively for retransmission, the effect of lower power consumption can be obtained as compared with the case where all the channels are used for normal data communication.
[0029]
In addition, since the main channel is appropriately switched based on the communication quality of each channel, even if the communication quality of any of the radio frequency bands is poor, the communication quality can be kept good.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first connection configuration example of a mobile phone and a base station according to an embodiment of the present invention.
FIG. 2 is a diagram showing a second connection configuration example between the mobile phone and the base station according to the embodiment;
FIG. 3 is a block diagram showing a configuration of a mobile phone (terminal 3) according to the embodiment.
FIG. 4 is a flowchart illustrating a flow of a reception control process performed by the mobile phone illustrated in FIG. 3;
FIG. 5 is a conceptual diagram showing a flow of data interpolation processing performed by the mobile phone shown in FIG.
[Explanation of symbols]
1, 2, 4 base station, 3 terminal (cellular phone), 100, 101 service area, 201 radio unit (5 GHz), 202 modulation / demodulation unit (5 GHz), 203 radio unit (800 MHz), 204 Modulation / demodulation unit (800 MHz), 205: operation unit, 206: display unit, 207: terminal control unit, 208: error detection / processing unit, 209: data execution unit

Claims (5)

A plurality of wireless communication means for performing wireless communication using frequencies of different radio frequency bands,
Terminal control means for allocating each of the radio frequency bands to different channels, and performing control to simultaneously communicate using at least two or more of the channels,
A portable terminal device comprising: A plurality of wireless communication means for performing wireless communication using frequencies of different radio frequency bands,
Terminal control means for allocating each of the radio frequency bands to different channels and performing control to simultaneously communicate using at least two or more communication methods,
A portable terminal device comprising: The mobile terminal device according to claim 1, wherein the terminal control unit uses the one of the channels exclusively for retransmission. 3. The terminal control unit according to claim 1, wherein the terminal control unit switches between using each channel as a main channel and using each channel as a subchannel based on communication quality of each channel. 4. Mobile terminal device. Assigning multiple radio frequency bands to different channels;
A step of simultaneously performing wireless communication using at least two or more of the channels, and a step of performing retransmission of received data by wireless communication using any one of the channels,
An error data retransmission method comprising:

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