JP2013223122A - Mobile terminal and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile terminal and a communication method, capable of securely preventing the occurrence of abnormal communication caused by interference between signals.SOLUTION: A mobile terminal 100 includes: a receiver unit 11 for receiving band information related to the transmission band of a PUSCH signal; a likelihood determination unit 12 for setting lower likelihood to determine that the transmission band of the PUSCH signal includes a PUCCH band (second frequency band); based on the set likelihood, a decoder unit 13 for decoding the received band information to determine whether or not the transmission band of the PUSCH signal includes the PUCCH band; and on determination that the transmission band of the PUSCH signal includes the PUCCH band, a band modification unit 2 for performing processing to reduce the possibility of transmitting the PUSCH signal at the PUCCH band, to transmit the PUSCH signal. By this, it is possible to securely prevent the occurrence of abnormal communication caused by interference between signals.

Description

  The present invention relates to a mobile terminal capable of transmitting a signal to a system band including a first frequency band and a second frequency band, and a communication method performed by the mobile terminal.

  Conventionally, a method of mixing a plurality of mobile communication systems has been proposed in carrier aggregation in which a plurality of fundamental frequency blocks are integrated to increase the bandwidth.

  For example, in the control information signal transmission method described in Patent Document 1, a UCI (Uplink Control Information) signal is transmitted to a base station apparatus of a mobile communication system having a system band composed of a plurality of component carriers. UCI signal to PUSCH (Physical Uplink Shared. CHannel) signal generated and transmitted in the same subframe as UCI signal in user-specific component carrier used for transmission of PUCCH (Physical Uplink Control CHannel) signal Are multiplexed and transmitted to the base station apparatus.

JP 2011-188468 A

  FIG. 1 is a band explanatory diagram illustrating interference that occurs when a PUSCH signal is received at the timing of receiving a PUCCH signal. As shown in FIG. 1, when the PUSCH signal is received at the timing of receiving the PUCCH signal, there is no orthogonal relationship between the PUSCH signal and the PUCCH signal, so that the PUSCH signal and the eNB (evolved Node B: base station) The interference power is large for both PUCCH signals.

  Due to the interference described above, CQI (Channel Quality Indicator), RI (Rank Indicator), and PMI (Precoding Matrix Indicator) of PUCCH signals of all UEs (User Equipment: mobile stations) at the above timings. The reception characteristics of the coding matrix), Ack / Nack (reception success response / reception failure response), and SR (Scheduling Request: scheduling request) are degraded and may not reach the eNB, which may cause a communication abnormality.

  In addition, due to the above-described interference, when the eNB performs a calculation process that averages the interference power of the PUCCH signal to some extent, the instantaneous interference increase due to the PUSCH signal continues for a long time with a large amount of uplink interference. And the calculation result of the interference power of the PUCCH signal becomes abnormal. As a result, the control by the power controller (power control: power control device) of the PUCCH signal becomes abnormal, and the uplink power transmitted to the UE becomes excessive, which may cause a communication abnormality.

  Furthermore, due to the above-described interference, the reception characteristics of the PUSCH signal at the above-described timing may be deteriorated, and communication abnormality may occur.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a mobile terminal and a communication method that can more reliably prevent the occurrence of communication abnormality due to signal-to-signal interference. With the goal.

  A mobile terminal according to an aspect of the present invention is a mobile terminal capable of transmitting a signal to a system band configured to include a first frequency band and a second frequency band, the first being higher than the second frequency band. A receiving means for receiving band information relating to a transmission band of a signal that is more suitable to be transmitted in one frequency band, and a likelihood to be set by lowering a likelihood of determining that the signal transmission band includes the second frequency band A band determining unit for determining whether the transmission band of the signal includes the second frequency band based on the determining unit, the band information received by the receiving unit and the likelihood set by the likelihood determining unit; Control means for transmitting the signal by performing a process of reducing the probability of transmitting the signal in the second frequency band when the band determination means determines that the transmission band of the signal includes the second frequency band; Specially equipped with To.

  According to a mobile terminal according to an aspect of the present invention, band information related to a transmission band of a signal that is appropriate to be transmitted in the first frequency band is received, and it is determined that the transmission band of the signal includes the second frequency band. If the transmission band of the signal is determined to include the second frequency band based on the received band information and the set likelihood, the signal is set to the second frequency. The signal is transmitted by performing processing for reducing the probability of transmission in the band. Thus, when the transmission band of the signal includes the second frequency band, in order to reduce the probability of transmitting the signal in the second frequency band, for example, a signal such as a PUSCH signal and the second frequency band For example, the probability of interference with a PUCCH signal or the like transmitted at the time decreases. As a result, it is possible to more reliably prevent the occurrence of communication abnormalities resulting from signal-to-signal interference.

  In the mobile terminal according to another aspect, the above-described processing may be control to transmit a signal only in the first frequency band.

  In this embodiment, when the transmission band of the signal includes the second frequency band, control is performed so that the signal is transmitted only in the first frequency band. For example, a signal such as a PUSCH signal and the second frequency band are controlled. For example, the probability of interference with a PUCCH signal or the like transmitted at the time decreases. As a result, it is possible to more reliably prevent the occurrence of communication abnormalities resulting from signal-to-signal interference.

  A communication method according to an aspect of the present invention is a communication method performed by a mobile terminal capable of transmitting a signal to a system band configured to include a first frequency band and a second frequency band. A reception step for receiving band information related to a transmission band of a signal that is more suitable to be transmitted in the first frequency band than a band; and a likelihood of determining that the transmission band of the signal includes the second frequency band; Based on the likelihood determining step to be set, the band information received by the receiving step, and the likelihood set by the likelihood determining step, the mobile terminal determines whether the signal transmission band includes the second frequency band or not. A band determining step for determining, and when the band determining step determines that the transmission band of the signal includes the second frequency band, a process for reducing the probability of transmitting the signal in the second frequency band And having a control step of transmitting the signal is performed is.

  According to the communication method of one aspect of the present invention, band information related to a transmission band of a signal that is appropriate to be transmitted in the first frequency band is received, and it is determined that the transmission band of the signal includes the second frequency band. If the transmission band of the signal is determined to include the second frequency band based on the received band information and the set likelihood, the signal is set to the second frequency. The signal is transmitted by performing processing for reducing the probability of transmission in the band. Thus, when the transmission band of the signal includes the second frequency band, in order to reduce the probability of transmitting the signal in the second frequency band, for example, a signal such as a PUSCH signal and the second frequency band For example, the probability of interference with a PUCCH signal or the like transmitted at the time decreases. As a result, it is possible to more reliably prevent the occurrence of communication abnormalities resulting from signal-to-signal interference.

  ADVANTAGE OF THE INVENTION According to this invention, the mobile terminal and communication method which can prevent more reliably generation | occurrence | production of the communication abnormality resulting from a signal and signal interference can be provided.

It is band explanatory drawing explaining the interference which generate | occur | produces when receiving a PUSCH signal at the timing which receives a PUCCH signal. It is a functional block diagram for demonstrating the outline of the main function structures of a mobile terminal. It is a physical block diagram for demonstrating the outline of the main physical structures of a mobile terminal. It is a flowchart for demonstrating the flow of the band change process in a mobile terminal.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

(1) Interference between PUCCH signal and PUSCH signal First, interference between a PUCCH signal and a PUSCH signal will be described with reference to FIG. FIG. 1 is a band explanatory diagram illustrating interference that occurs when a PUSCH signal is received at the timing of receiving a PUCCH signal, where the vertical axis indicates frequency and the horizontal axis indicates time.

  Here, the PUCCH band is a band multiplexed between users, and includes CQI (Channel Quality Indicator: channel quality signal), RI (Rank Indicator: rank information), PMI (Precoding Matrix Indicator: precoding matrix), Ack. PUCCH signals such as / Nack (reception success response / reception failure response) and SR (Scheduling Request) are transmitted. In the PUCCH band, the center frequency of a digitalized carrier wave is hopped at every predetermined time (intra-subframe frequency hopping), so that communication quality can be improved due to the effect of frequency diversity. Further, the PUCCH exclusion band is a band in which no PUCCH signal is transmitted. If the transmission band of the PUSCH signal is the PUCCH band, the PUSCH signal and the PUCCH signal may interfere with each other.

  Here, the mobile terminal according to this embodiment includes a PUSCH band (a system band as a transmission band of a PUSCH signal) configured to include a PUCCH exclusion band (first frequency band) and a PUCCH band (second frequency band). ) On the other hand, it is a terminal such as a mobile phone terminal or a smartphone capable of transmitting an uplink signal. This mobile terminal makes it difficult to transmit the PUSCH signal to the PUCCH band, thereby reducing the probability that the PUSCH signal and the PUCCH signal interfere with each other, and more reliably preventing the occurrence of communication abnormality.

(2) Configuration of Mobile Terminal Next, the configuration of the mobile terminal according to the present embodiment will be described using FIG. 2 and FIG. FIG. 2 is a functional block diagram for explaining an outline of the main functional configuration of the mobile terminal 100, and FIG. 3 is a physical configuration diagram for explaining an outline of the main physical configuration of the mobile terminal 100.

  As shown in FIG. 3, the mobile terminal 100 includes a CPU 101 (Central Processing Unit), a RAM 102 (Random Access Memory), a ROM 103 (Read Only Memory), an operation unit 104, and a wireless communication unit 105 as main physical components. , A portable computer terminal configured by hardware such as the display 106 and the antenna 107. When these components operate, each function of the mobile terminal 100 is exhibited.

  As shown in FIG. 2, the mobile terminal 100 includes, as main functional components, a reception composite processing unit 1, a band changing unit 2 (control means) connected to the reception composite processing unit 1, and a bandwidth. The transmission unit 3 (control means) is connected to the changing unit 2 in communication. The reception composite processing unit 1 includes a reception unit 11 (reception unit), a likelihood determination unit 12 (likelihood determination unit), and a decoding unit 13 (band determination unit).

  The receiving unit 11 is a communication function part capable of receiving various signals from a base station that is a communication target of the mobile terminal 100. For example, the receiving unit 11 can receive a PDCCH (Physical Downlink Control CHannel) signal (DCI format 0) from the base station. The PDCCH signal is a signal having band information regarding the transmission band of the PUSCH signal. The PUSCH signal is a signal that is more suitable to be transmitted in the PUCCH exclusion band (first frequency band) than in the PUCCH band (second frequency band).

  The likelihood determination unit 12 is an information storage part that is set by reducing the likelihood of determining that the transmission band of the PUSCH signal includes the PUCCH band. The likelihood indicates the plausibility of the precondition when the determination result that the transmission band of the PUSCH signal includes the PUCCH band is derived, and is represented by a numerical value, for example. Likelihood is set for each band, and when the likelihood of becoming a PUCCH band decreases and the likelihood of becoming a PUCCH exclusion band increases, the likelihood of determining that the transmission band of the PUSCH signal includes the PUCCH band decreases. That is, it is difficult to determine that the transmission band of the PUSCH signal includes the PUCCH band.

  In addition, the likelihood determination part 12 has previously memorize | stored beforehand the reference value of likelihood used as a PUCCH band, and the reference value of likelihood used as a PUCCH exclusion band. The likelihood determining unit 12 can adjust the likelihood according to the instruction signal received from the decoding unit 13 and the receiving unit 11.

  The decoding unit 13 is an arithmetic processing part that determines whether the transmission band of the PUSCH signal includes the PUCCH band based on the band information received by the receiving unit 11 and the likelihood set by the likelihood determining unit 12. is there. The decoding unit 13 decodes information (Resource block assignment and hopping resource allocation) indicating the number of allocated RBs (resource blocks) and the allocated RB positions based on the information on the likelihood of the likelihood determining unit 12. Then, the decoding unit 13 determines whether or not the transmission band of the PUSCH signal includes the PUCCH band.

  The band changing unit 2 is a control part that performs a process of reducing the probability of transmitting the PUSCH signal in the PUCCH band when the decoding unit 13 determines that the transmission band of the PUSCH signal includes the PUCCH band. The band changing unit 2 controls the likelihood determining unit 12 to reduce the likelihood of becoming the PUCCH band when the decoding unit 13 determines that the transmission band of the PUSCH signal includes the PUCCH band, Control is performed to increase the likelihood of becoming a PUCCH exclusion band. Accordingly, when the decoding unit 13 determines that the transmission band of the PUSCH signal includes the PUCCH band, the PUSCH band is changed, and the probability that the PUSCH signal is transmitted in the PUCCH band decreases.

  Note that the band changing unit 2 can perform processing such that the probability that the PUSCH signal is transmitted in the PUCCH band becomes zero. As a result, the PUSCH signal is transmitted only in the PUCCH exclusion band.

  The transmission unit 3 is a communication function part that transmits a PUSCH signal to the base station in the PUSCH band changed by the band changing unit 2. The transmission unit 3 can transmit the PUSCH signal even in the PUCCH band in the subframe in which the PUCCH signal is not transmitted. Note that, when a PUSCH signal is assigned to the PUCCH band after the PUSCH band is changed by the band changing unit 2, the transmission unit 3 may not transmit the PUSCH signal.

(3) Flow of Band Change Process in Mobile Terminal Next, the flow (communication method) of the band change process in the mobile terminal 100 will be described with reference to FIG. FIG. 4 is a flowchart for explaining the flow of the band changing process in the mobile terminal 100. The process shown in the flowchart of FIG. 4 is repeatedly executed at a predetermined timing from when the mobile terminal 100 is powered on until it is turned off.

  First, in a situation where the receiving unit 11 receives various signals from the base station, the receiving unit 11 receives a PDCCH signal (DCI format0) (step S1, receiving step).

  Next, the likelihood determining unit 12 sets the likelihood of determining that the transmission band of the PUSCH signal includes the PUCCH band, and the decoding unit 13 determines based on information on the likelihood of the likelihood determining unit 12. Then, the information (Resource block assignment and hopping resource allocation) indicating the number of assigned RBs and the assigned RB position is decoded (step S2, likelihood determining step). Then, the decoding unit 13 determines whether or not the transmission band of the PUSCH signal includes the PUCCH band (step S3, band determination step). When it is determined that the transmission band of the PUSCH signal includes the PUCCH band, the process proceeds to step S4 described later. On the other hand, when it is determined that the transmission band of the PUSCH signal does not include the PUCCH band, the process proceeds to step S5 described later.

  In step S4, the band changing unit 2 controls the likelihood determining unit 12 to lower the likelihood of becoming a PUCCH band and to increase the likelihood of becoming a PUCCH excluded band (control step). . Thereby, the PUSCH band is changed, and the probability that the PUSCH signal is transmitted in the PUCCH band decreases. And the transmission part 3 transmits a PUSCH signal to a base station by the PUSCH band changed by the band change part 2 (control step). Then, a series of processing ends.

  In step S5, the likelihood adjustment by the band changing unit 2 is not performed (control step). For this reason, the PUSCH band is not changed, and in this state, the transmission unit 3 transmits the PUSCH signal to the base station (control step). Then, a series of processing ends.

(4) Operation and Effect According to the Present Invention According to the mobile terminal 100, band information related to the transmission band of the PUSCH signal appropriate to be transmitted in the PUCCH exclusion band is received, and it is determined that the transmission band of the PUSCH signal includes the PUCCH band. When the transmission band of the PUSCH signal is determined to include the PUCCH band based on the received band information and the set likelihood, the PUSCH signal is transmitted in the PUCCH band. A PUSCH signal is transmitted by performing processing for reducing the probability. As described above, when the transmission band of the above-described PUSCH signal is the PUCCH band, the probability that the PUSCH signal and the PUCCH signal transmitted in the PUCCH band interfere with each other in order to reduce the probability of transmitting the PUSCH signal in the PUCCH band. Decreases. As a result, it is possible to more reliably prevent the occurrence of communication abnormalities resulting from signal-to-signal interference.

  Moreover, when the transmission band of the above-described PUSCH signal includes the PUCCH band, it is possible to control to transmit the PUSCH signal only in the PUCCH exclusion band. Thereby, the probability that a signal such as a PUSCH signal, for example, interferes with, for example, a PUCCH signal transmitted in the PUCCH band is reduced. As a result, it is possible to more reliably prevent the occurrence of communication abnormalities resulting from signal-to-signal interference.

(5) Modified Example In the above-described embodiment, the band changing unit 2 controls the likelihood determining unit 12 to reduce the likelihood of becoming a PUCCH band and increases the likelihood of becoming a PUCCH excluded band. However, instead of the likelihood changing process, when the PUCCH band is decoded, the PUCCH band may be replaced with the PUCCH excluded band or the uplink transmission may not be performed in the PUCCH band.

  ADVANTAGE OF THE INVENTION According to this invention, the mobile terminal and communication method which can prevent more reliably generation | occurrence | production of the communication abnormality resulting from a signal and signal interference can be provided.

  DESCRIPTION OF SYMBOLS 1 ... Reception composite process part, 2 ... Band change part, 3 ... Transmission part, 11 ... Reception part, 12 ... Likelihood determination part, 13 ... Decoding part, 100 ... Mobile terminal, 101 ... CPU, 102 ... RAM, 103 ... ROM, 104 ... operation unit, 105 ... wireless communication unit, 106 ... display, 107 ... antenna.

Claims (3)

A mobile terminal capable of transmitting a signal to a system band configured to include a first frequency band and a second frequency band,
Receiving means for receiving band information relating to a transmission band of the signal that is more suitable to be transmitted in the first frequency band than in the second frequency band;
Likelihood determining means for reducing and setting the likelihood of determining that the transmission band of the signal includes the second frequency band;
Band determining means for determining whether a transmission band of the signal includes the second frequency band based on the band information received by the receiving means and the likelihood set by the likelihood determining means When,
When the transmission band of the signal is determined to include the second frequency band by the band determination unit, the signal is transmitted by performing a process for reducing the probability of transmitting the signal in the second frequency band. Control means to
A mobile terminal comprising:   The mobile terminal according to claim 1, wherein the processing is control to transmit the signal only in the first frequency band. A communication method performed by a mobile terminal capable of transmitting a signal to a system band configured to include a first frequency band and a second frequency band,
A reception step of receiving band information relating to a transmission band of the signal that is more suitable to be transmitted in the first frequency band than in the second frequency band;
A likelihood determining step of setting a reduced likelihood of determining that the transmission band of the signal includes the second frequency band; and
The mobile terminal determines whether the transmission band of the signal includes the second frequency band based on the band information received in the reception step and the likelihood set in the likelihood determination step. A bandwidth determination step,
When it is determined in the band determination step that the transmission band of the signal includes the second frequency band, the mobile terminal performs a process of reducing the probability of transmitting the signal in the second frequency band. A control step for transmitting the signal;
A communication method characterized by comprising:

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