WO2014175156A1

WO2014175156A1 - Mobile communication terminal and mobile communication terminal control method

Info

Publication number: WO2014175156A1
Application number: PCT/JP2014/060912
Authority: WO
Inventors: 桂安藤; 大將梅田; 望座間
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2013-04-23
Filing date: 2014-04-17
Publication date: 2014-10-30
Also published as: JP2014216711A; JP5762461B2

Abstract

Provided is a mobile communication terminal that can use both a state of simultaneously performing communications by use of two bands and a state of performing a communication by selection of one band to achieve appropriate adaptation. A mobile communication terminal of the present invention comprises: an antenna; a band-A transmission/reception circuit; a band-B transmission/reception circuit; a variable multiplexer; a recording unit that records a plurality of pieces of setting information for the variable multiplexer; and a filter control unit. The filter control unit controls the variable multiplexer in accordance with the setting information. The plurality of pieces of setting information include a piece of setting information corresponding to the state of simultaneously performing communications by use of both bands A and B, a piece of setting information corresponding to the state of performing a communication by use of only the band A and to a state of standby using the band A, and a piece of setting information corresponding to the state of performing a communication by use of only the band B and to a state of standby using the band B. The filter control unit sets the variable multiplexer on the basis of the setting information corresponding to any one of the states.

Description

Mobile communication terminal and mobile communication terminal control method

The present invention relates to a mobile communication terminal capable of simultaneously communicating in a plurality of bands and a control method thereof.

Carrier aggregation is known as a wireless communication method for performing communication using two bands at the same time in order to widen the communication band (see Non-Patent Document 1). Further, Patent Document 1 is known as a technique related to a receiver having a filter circuit that can be commonly used in wireless communication systems having different reception bands.

Japanese Patent Laid-Open No. 10-41844

Mobile communication terminals capable of carrier aggregation also perform communication using a communication method that selects one of the two bands, so both the state of simultaneous communication in two bands and the state of selecting one band for communication are supported. Must. However, the technique of Patent Document 1 is not a technique for a communication system that uses two bands simultaneously, but is a technique related to a communication system that selects one of two bands.

FIG. 1 shows a functional configuration of a mobile communication terminal that performs carrier aggregation in band A and band B when the conventional technology is used. FIG. 2 is a diagram showing the filter characteristics of the multiplexer of the mobile communication terminal of FIG. The mobile communication terminal 700 includes an antenna 110, a band A transmission / reception circuit 170-A that transmits / receives a band A signal, a band B transmission / reception circuit 170-B that transmits / receives a band B signal, and a band B signal that transmits a band A signal. And a baseband signal generator 150 that generates a baseband signal. The multiplexer 760 includes a first filter 761 that blocks the band B and a second filter 762 that blocks the band A signal and transmits the band B signal. The transmission / reception circuits 170-A and 170-B include duplexers 120-A and 120-B, power amplifiers 131-A and 131-B, low noise amplifiers 132-A and 132-B, and orthogonal modulation units 141-A and 141-. B, orthogonal demodulation units 142-A and 142-B, D / A conversion units 143-A and 143-B, and A / D conversion units 144-A and 144-B.

2, F761 indicates the frequency characteristic of the first filter 761, and F762 indicates the frequency characteristic of the second filter 762. When the interval 909 between the band A and the band B is narrow, in order to communicate simultaneously in the two bands, the multiplexer 760 must ensure isolation between the two bands at the expense of an increase in insertion loss of the pass band. I do not get. If the multiplexer 760 is set in this way, the insertion loss increases even when one band is selected for communication, and deterioration of the maximum transmission power and reception sensitivity occurs. .

An object of the present invention is to provide a mobile communication terminal that can appropriately cope with both a state where two bands are simultaneously communicated and a state where one band is selected and communicated.

The mobile communication terminal of the present invention includes an antenna, a band A transmission / reception circuit that transmits / receives a band A signal, a band B transmission / reception circuit that transmits / receives a band B signal, a variable multiplexer, and a recording unit that records a plurality of setting information of variable multiplexers, A filter control unit is provided. The variable multiplexer sends a band A signal from the antenna side to the band A transmission / reception circuit side, a band B signal from the antenna side to the band B transmission / reception circuit side, and a band A signal from the band A transmission / reception circuit side. The band B signal from the band B transmission / reception circuit side is combined and sent to the antenna side. The filter control unit controls the variable multiplexer according to the setting information. The plurality of setting information includes setting information corresponding to a state in which communication is simultaneously performed in both band A and band B, setting information corresponding to a state in which communication is performed only in band A and a standby state in band A, and only band B And the setting information corresponding to the standby state in band B. The filter control unit sets the variable multiplexer based on setting information corresponding to each state.

According to the mobile communication terminal of the present invention, the frequency characteristic of the multiplexer is variable, and the setting corresponding to the state of the mobile communication terminal can be performed. Therefore, even when there is a characteristic that must be compromised when communicating in two bands simultaneously, there is no need to compromise when communicating in only one band. Therefore, the mobile communication terminal of the present invention can appropriately cope with both the state of communicating simultaneously in two bands and the state of selecting one band for communication.

The figure which shows the function structure of the mobile communication terminal which performs a carrier aggregation by the band A and the band B at the time of using a prior art. The figure which shows the characteristic of the filter of the multiplexer of the mobile communication terminal of FIG. 1 is a diagram illustrating a functional configuration example of a mobile communication terminal according to a first embodiment. FIG. 3 is a diagram illustrating characteristics of the variable multiplexer of the mobile communication terminal according to the first embodiment. The figure which shows the example of the control flow of the variable multiplexer of the mobile communication terminal of this invention. The figure which shows the frequency band of the bands 1-K. The figure which shows the function structural example of the mobile communication terminal of this modification.

Hereinafter, embodiments of the present invention will be described in detail. In addition, the same number is attached | subjected to the component which has the same function, and duplication description is abbreviate | omitted.

FIG. 3 shows a functional configuration example of the mobile communication terminal of the first embodiment. FIG. 4 is a diagram illustrating characteristics of the variable multiplexer of the mobile communication terminal according to the first embodiment. FIG. 5 is a diagram illustrating an example of a control flow of the variable multiplexer of the mobile communication terminal according to the first embodiment. The mobile communication terminal 100 includes an antenna 110, a band A transmission / reception circuit 170-A for transmitting / receiving a band A signal, a band B transmission / reception circuit 170-B for transmitting / receiving a band B signal, a variable multiplexer 160, and a plurality of variable multiplexer setting information. Recording unit 190, filter control unit 165, and baseband signal generator 150. The antenna 110, the band A transmission / reception circuit 170-A, the band B transmission / reception circuit 170-B, and the baseband signal generator are the same as those of the mobile communication terminal 700.

The variable multiplexer 160 sends a band A signal from the antenna 110 side to the band A transmission / reception circuit 170-A side, and sends a band B signal from the antenna 110 side to the band B transmission / reception circuit 170-B side. The band A signal from the circuit 170-A side and the band B signal from the band B transmission / reception circuit 170-B side are combined and sent to the antenna 110 side. For example, the variable multiplexer 160 may include a first variable filter 161 that transmits a band A signal and blocks a band B signal, and a second variable filter 162 that blocks a band A signal and transmits a band B signal. Good.

The filter control unit 165 controls the variable multiplexer 160 according to the setting information. The plurality of setting information includes setting information corresponding to a state in which communication is simultaneously performed in both band A and band B, setting information corresponding to a state in which communication is performed only in band A and a standby state in band A, and only band B And the setting information corresponding to the standby state in band B. The filter control unit 165 sets the variable multiplexer 160 based on setting information corresponding to each state.

The setting information will be described with reference to FIG. The setting information in which the characteristic of the first variable filter 161 is F761 and the characteristic of the second variable filter 162 is F762 is set as the setting information corresponding to the state of simultaneous communication in both the band A and the band B. The setting information in which the characteristic of the first variable filter 161 is F161A and the characteristic of the second variable filter 162 is F162A is the setting information corresponding to the state of communication using only band A and the standby state of band A. In addition, setting information such that the characteristic of the first variable filter 161 is F161B and the characteristic of the second variable filter 162 is F162B includes setting information corresponding to the state of communication only in the band B and the standby state in the band B. To do.

As described in “Problems to be Solved by the Invention”, when the distance between the band A and the band B is narrow, in order to communicate simultaneously in both the band A and the band B, the transmission loss is sacrificed to some extent ( Isolation between the two bands must be ensured (compromising the characteristics of the passage loss). In the case of the variable multiplexer 160 of the mobile communication terminal 100, when performing communication using only band A, the characteristic of the first variable filter 161 can be F161A, and the characteristic of the second variable filter 162 can be F162A. Further, when performing communication using only the band B, the characteristic of the first variable filter 161 can be F161B, and the characteristic of the second variable filter 162 can be F162B. Therefore, when communication is performed using only one band, a low passage loss can be set. Therefore, even if there is a characteristic that must be compromised when communicating in two bands simultaneously, there is no need to compromise when communicating in only one band.

Next, the control flow of the variable multiplexer of the mobile communication terminal will be described with reference to FIG. When the mobile communication terminal 100 is turned on, the mobile communication terminal 100 reads the setting information from the recording unit 190 according to the internal cell search order and sets the variable multiplexer 160. Then, the mobile communication terminal 100 acquires a band instruction (information) to be used when waiting from the network side (S181). The filter control unit 165 reads the setting information corresponding to the standby state in the band designated by this instruction from the recording unit 190, and sets the variable multiplexer 160 (S161).

In the standby state, the presence / absence of transmission / reception or data transmission / reception is confirmed (S191). When step S191 is No (when there is no outgoing / incoming call or data transmission / reception), it is confirmed whether there is a new instruction from the network side (S182). If step S182 is No, the process returns to step S191. When step S182 is Yes, it returns to step S161, reads the setting information corresponding to the standby state in the band designated by the new instruction from the recording unit 190, and sets the variable multiplexer 160 (S161).

When step S191 is Yes (when there is an incoming / outgoing call or data transmission / reception), it is confirmed whether there is a new instruction from the network side (S183). When step S183 is Yes, the setting information corresponding to the state which communicates only in the band designated by the new instruction is read from the recording unit 190, and the variable multiplexer 160 is set (S162). When step S183 is No, the setting information corresponding to the state of communicating only in the band used in the standby state is read from the recording unit 190, and the variable multiplexer 160 is set (S163).

When the communication is in progress, it is confirmed whether the communication is completed (S192). When step S192 is Yes (when communication is completed), the process returns to step S181 (returns to the standby state). When Step S192 is No (when communication is continued), it is confirmed whether there is a new instruction from the network side (S184). If step S184 is No, the process returns to step S192. When step S184 is Yes, the band to be used is determined according to the new instruction, the variable multiplexer is controlled (S164), and the process returns to step S192. For example, when the instruction communicates simultaneously in both band A and band B, the filter control unit 165 reads setting information corresponding to the state in which communication is performed simultaneously in both band A and band B from the recording unit 190, and the variable multiplexer 160. Set. Further, when the communication is performed using only the band B, the filter control unit 165 reads setting information corresponding to the state of performing communication using only the band B from the recording unit 190 and sets the variable multiplexer 160. Such a processing flow may be repeated while the mobile communication terminal 100 is powered on.

According to the mobile communication terminal of the present invention, the frequency characteristic of the multiplexer is variable, and the setting corresponding to the state of the mobile communication terminal can be performed. Therefore, even when there is a characteristic that must be compromised when communicating in two bands simultaneously, there is no need to compromise when communicating in only one band. Therefore, the mobile communication terminal of the present invention can appropriately cope with both the state of communicating simultaneously in two bands and the state of selecting one band for communication.
[Modification]
In the first embodiment, the description has been given focusing on two bands. This modification will be described on the assumption that there are three or more bands. FIG. 6 is a diagram illustrating frequency bands of bands 1 to K. However, K is an integer of 3 or more. I and j are integers of 1 to K, and i <j. As shown in FIG. 6, the bands are referred to as bands 1 to K from the lowest frequency. FIG. 7 is a functional configuration example of the mobile communication terminal according to this modification. The processing flow relating to the control of the multiplexer is the same as that in FIG.

The mobile communication terminal 300 is different from the mobile communication terminal 100 in that it includes a switch 367 for selecting two bands and includes K transmission / reception circuits 170-1 to 170-K for bands 1 to K. . Also, the setting information recorded in the recording unit 390 and the number of bands corresponding to the baseband signal generator 350 are different. The recording unit 390 sets setting information corresponding to a state in which communication is simultaneously performed in both bands of the combination for all combinations for selecting two of the K bands, and only the band for the K bands. The communication state and setting information corresponding to the standby state in the band are recorded.

For example, when the mobile communication terminal 300 selects band i and band j according to an instruction from the network side, the switch 367 connects the transmission / reception circuit 170-i and the transmission / reception circuit 170-j to the variable multiplexer 160. The filter control unit 165 controls the variable multiplexer 160 with the band i as the band A of the first embodiment and the band j as the band B of the first embodiment. That is, the filter control unit 165 sets the variable multiplexer 160 based on setting information corresponding to a state in which communication is simultaneously performed in both bands i and j.

Since the mobile communication terminal 100 is premised on two bands, according to instructions from the network side, a determination of a band to be awaited, a determination of a band for communication in a single band, a state of communication in a single band, and simultaneous communication in two bands The decision to switch the status to be performed Since the mobile communication terminal 300 is premised on K bands, information on which band to use is necessary even when communicating simultaneously in two bands. Therefore, the mobile communication terminal 300 determines a standby band, a single band communication band, two simultaneous band determinations, a single band communication state, and two bands according to an instruction from the network side. It decides to switch the state of communication at the same time. For this reason, the processing flow of FIG. 5 is different in that the determination of two bands to be communicated simultaneously is included in the processing of step S164 when communication is simultaneously performed in two bands. In other cases, there is a difference between selecting one from K or selecting one from two, but the flow of processing is the same. Since the mobile communication terminal of the first modification is also configured as described above, the same effects as in the first embodiment can be obtained.
[Program, recording medium]
The various processes described above are not only executed in time series according to the description, but may also be executed in parallel or individually as required by the processing capability of the apparatus that executes the processes or as necessary. Needless to say, other modifications are possible without departing from the spirit of the present invention.

In addition, when the above configuration is realized by a computer, the processing contents of the functions that each device should have are described by a program. The processing functions are realized on the computer by executing the program on the computer.

The program describing the processing contents can be recorded on a computer-readable recording medium. As the computer-readable recording medium, any recording medium such as a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory may be used.

Also, this program is distributed by selling, transferring, or lending a portable recording medium such as a DVD or CD-ROM in which the program is recorded. Furthermore, the program may be distributed by storing the program in a storage device of the server computer and transferring the program from the server computer to another computer via a network.

For example, a computer that executes such a program first stores a program recorded on a portable recording medium or a program transferred from a server computer in its own storage device. When executing the process, the computer reads a program stored in its own recording medium and executes a process according to the read program. As another execution form of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and the program is transferred from the server computer to the computer. Each time, the processing according to the received program may be executed sequentially. In addition, the program is not transferred from the server computer to the computer, and the above-described processing is executed by a so-called ASP (Application Service Provider) type service that realizes a processing function only by an execution instruction and result acquisition. It is good. Note that the program in this embodiment includes information that is used for processing by an electronic computer and that conforms to the program (data that is not a direct command to the computer but has a property that defines the processing of the computer).

In this embodiment, the present apparatus is configured by executing a predetermined program on a computer. However, at least a part of these processing contents may be realized by hardware.

100, 300, 700 Mobile communication terminal 110 Antenna 120 Duplexer 131 Power amplifier 132 Low noise amplifier 141 Orthogonal modulator 142 Orthogonal demodulator 143 D / A converter 144 A /

D converter

150, 350 Baseband signal generator 160 Variable multiplexer 161 first variable filter 162 second variable filter 165 filter control unit 170 transmission /

reception circuit

190, 390 recording unit 367 switch 760 multiplexer 761 first filter 762 second filter

Claims

An antenna,
A band A transceiver circuit for transmitting and receiving a band A signal;
A band B transmitting / receiving circuit for transmitting and receiving a band B signal;
A band A signal from the antenna side is sent to the band A transmission / reception circuit side, a band B signal from the antenna side is sent to the band B transmission / reception circuit side, and a band A signal from the band A transmission / reception circuit side is sent. And a variable multiplexer for combining the band B signal from the band B transmission / reception circuit side and sending it to the antenna side,
A recording unit that records a plurality of setting information of the variable multiplexer;
A filter control unit for controlling the variable multiplexer according to the setting information;
With
The plurality of setting information includes
Setting information corresponding to the state of simultaneous communication in both band A and band B;
Setting information corresponding to the state of communication only in band A and the state of standby in band A,
Setting information corresponding to the state of communication only in band B and the state of standby in band B;
Including
The mobile communication terminal, wherein the filter control unit sets the variable multiplexer based on setting information corresponding to each state.
The mobile communication terminal according to claim 1, wherein
K is an integer greater than or equal to 3,
The mobile communication terminal can select two of the K bands, set one selected band as band A and the other band as band B, and simultaneously communicate in both band A and band B. Mobile communication terminals that can
The setting information includes
For all of the combinations that select two of the K bands, setting information corresponding to the state of simultaneous communication in both bands of the combination;
For K bands, setting information corresponding to the state of communication only in that band and the standby state in that band;
The mobile communication terminal characterized by including.
The mobile communication terminal according to claim 1, wherein
In accordance with instructions from the network side, determine the standby band, determine the band to communicate in the single band, switch the state to communicate in the single band and the state to communicate in the two bands simultaneously,
The mobile communication terminal, wherein the filter control unit sets the variable multiplexer based on setting information corresponding to a state determined by the determination.
The mobile communication terminal according to claim 2, wherein
According to instructions from the network side, determination of a standby band, determination of a band for communication in a single band, determination of two bands for simultaneous communication, determination of switching between a state for communication in a single band and a state for simultaneous communication in two bands And
The mobile communication terminal, wherein the filter control unit sets the variable multiplexer based on setting information corresponding to a state determined by the determination.
A method for controlling a mobile communication terminal according to claim 1 or 2,
An instruction corresponding step in which the filter control unit sets the variable multiplexer with setting information corresponding to a state according to the instruction when receiving an instruction regarding a band to be used from the network side;
When the mobile communication terminal changes from a standby state to a single band communication state, if there is no instruction about the band to be used from the network side, it will be in a state of communicating only in the band used in the standby state. Start setting step in which the filter control unit sets the variable multiplexer with corresponding setting information;
A method for controlling a mobile communication terminal.