JP2005341366A - Cellular phone terminal device - Google Patents

Cellular phone terminal device Download PDF

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Publication number
JP2005341366A
JP2005341366A JP2004159236A JP2004159236A JP2005341366A JP 2005341366 A JP2005341366 A JP 2005341366A JP 2004159236 A JP2004159236 A JP 2004159236A JP 2004159236 A JP2004159236 A JP 2004159236A JP 2005341366 A JP2005341366 A JP 2005341366A
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Prior art keywords
reception
diversity
means
receiving
operation
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JP2004159236A
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Japanese (ja)
Inventor
Ryoichi Enoshima
Kazutoshi Higuchi
Tsuyoshi Obuchi
堅 大淵
了一 榎嶋
和俊 樋口
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Hitachi Ltd
株式会社日立製作所
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Priority to JP2004159236A priority Critical patent/JP2005341366A/en
Publication of JP2005341366A publication Critical patent/JP2005341366A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • Y02D70/44Radio transmission systems, i.e. using radiation field
    • Y02D70/442Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas
    • Y02D70/444Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • Y02D70/44Radio transmission systems, i.e. using radiation field
    • Y02D70/448Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • Y02D70/449Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile

Abstract

<P>PROBLEM TO BE SOLVED: To improve usability by owning a receiving circuit in diversity-composition, operating diversity-reception efficiently, and reducing power-consumption. <P>SOLUTION: The diversity-composition comprises a receiving system which consists of transceiver antenna 1a and receiving means 4a, and a receiving system which consists of receive-only antenna 1b and receiving means 4b. Diversity receiving operation and diversity receiving operation are selective by changing receiving means 4b into operating state or non-operation state since whole control 11 controls diversity control means 9. Energy detection means 8 detects receiving energy C/I values in present condition, The whole control means 11 seeks data rate which is receivable from the detected C/I values, requests a base station to transmit data at the data rate, and control diversity control means 9, therefore, operation/non-operation of receiving means 4b in accordance with the data rate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile phone terminal apparatus that performs communication by a CDMA (Code Division Multiple Access) system, and more particularly to a control method at the time of diversity reception.

  Conventionally, diversity reception methods called antenna selection diversity and post-detection selection diversity are known. Antenna selection diversity is an antenna that uses a plurality of antennas shared by one receiving circuit, measures the received electric field strength of the received signal of each antenna in a receiving section that is not used for communication, and obtains an optimal reception level. The receiving circuit is switched. The post-detection selection diversity uses a plurality of antennas and receiving circuits corresponding to the antennas, and these receiving circuits are always operating. The switching of the reception signals of these reception circuits compares the received electric field strengths at these reception circuits, and selects the reception signal of one of the reception circuits as a detection output according to the comparison result.

In addition, a method in which the antenna selection diversity and the post-detection selection diversity are combined has been proposed. This is because an antenna selection diversity unit that switches any one antenna to a specific reception circuit based on a reception level at a specific reception circuit, and any one of the reception signals of a plurality of reception circuits are connected to these reception circuits. It is configured by a post-detection selection diversity unit that selects according to the comparison result of the reception level or synthesizes the received signals of these reception circuits in phase. Furthermore, a line quality detection unit that detects line quality during operation of the apparatus is provided, and during operation of the antenna selection diversity unit, power supply control is performed to stop power supply to a non-operating part in the selection diversity unit after detection (for example, Patent Document 1).
JP 2000-183793 A

  However, in the prior art described in Patent Document 1 in which diversity control is performed based on the reception level (reception electric field strength), when the communication method is the CDMA method, the diversity effect is low and sufficient call quality is obtained. I can't. In other words, the CDMA system is a system in which a single speech channel (physical channel) is shared by many users, and data is obtained by despreading a received signal spread with a spreading code assigned to itself by using the same spreading code. Play. For this reason, when diversity control is performed according to the reception level, there is a problem that a large number of user data is clogged in the channel, and there is little data allocated to itself, so that sufficient call quality cannot be maintained and communication reliability is lowered. is there.

  In particular, in an EV-DO (EVolution for Data Only: EVDO) system specialized for CDMA data communication, a downlink reception data rate is determined by a C / I (Carrier to Interfer Ratio) value of a reception signal. The C / I value corresponds to the ratio of the sum of the logical channels related to its own communication to the interference level. For example, when an interference wave exists, the reception level increases, but the level of the reception signal used for actual communication decreases. That is, the reception level and the C / I value do not always match. For this reason, the diversity control based only on the reception level includes a problem that the data rate of downlink information decreases. Further, there is a problem that the data throughput decreases due to the decrease in the data rate, the communication time increases, and the power consumption increases.

  An object of the present invention is to solve such a problem and maintain a high call quality by maintaining a high throughput without decreasing a reception data rate even in a diversity operation, and a convenient mobile phone with low power consumption. It is to provide a terminal device.

  In order to achieve the above object, the present invention provides a mobile phone terminal apparatus that communicates with a base station using a code division multiple access method, wherein a transmission data from the base station is received by a transmission / reception antenna. Receiving means, a second receiving means for receiving transmission data from the base station by a reception dedicated antenna, a signal synthesizing means for synthesizing received signals of the first and second receiving means, A reception energy detection means for detecting a reception energy C / I value related to its own communication using a reception signal of the second reception means, and a switching control of the operation / non-operation state of the second reception means, Diversity control means for switching between a diversity receiving operation in which the first and second receiving means operate and a non-diversity receiving operation in which only the first receiving means operates, and the reception detected by the received energy detecting means And control of the diversity control unit according to the energy C / I value, inoperative receiving means of the second from the operating state, or in which and a control unit for switching the operation state from the non-operating state.

  The reception energy detection means uses the reception signal of the first reception means to obtain the first reception energy C / I value, and uses the reception signal of the second reception means to obtain the second reception energy C / I value. , And a combined reception energy C / I value obtained by combining the first and second reception energy C / I values is generated, and the control means performs the first reception energy C / I during the non-diversity reception operation. By controlling the diversity control means according to the value, it switches to the diversity reception operation state, and at the time of the diversity reception operation, the diversity control means according to the first reception energy C / I value and the combined reception energy C / I value Is switched to the non-diversity reception operation state.

  A memory having a conversion table for converting the received energy C / I value to a corresponding receivable data rate, and the control means includes a first fetched from the received energy detecting means based on the conversion table; The received energy C / I value is converted into a first receivable data rate, and the combined received energy C / I value is converted into a second receivable data rate, and the first receivable can be received during non-diversity reception operation. When the data rate is smaller than the current receivable data rate, the diversity control means is controlled to switch to the diversity reception operation state, and during the diversity reception operation, the first receivable data rate can be received second. When the data rate is higher than the normal data rate, the diversity control means is controlled to switch to the non-diversity reception operation state. It is obtain things.

  The signal combining means outputs a combined signal of the received signals of the first and second receiving means during the diversity receiving operation, and outputs a received signal of the first receiving means during the non-diversity receiving operation. .

  In addition, a reception level detection unit that detects a reception level of the reception signal of the first reception unit and outputs a control signal when the detected reception level is smaller than a predetermined threshold is provided, and the diversity control unit detects the reception level. The second receiving means is switched from the operating state to the non-operating state or from the non-operating state to the operating state in accordance with a control signal output from the means.

  According to the present invention, the C / I value of the received signal at the time of diversity operation and non-diversity operation is detected, and diversity control is performed according to the C / I value, thereby reducing power consumption while maintaining a high data rate. Can be reduced, call quality is improved, usable time is increased, and usability is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a first embodiment of a cellular phone terminal device according to the present invention, wherein 1a is a transmission / reception antenna, 1b is a reception-only antenna, 2 is a transmission / reception wave selection filter (duplexer), 3 is a transmission means, 4a and 4b are receiving means, 5 is a frequency synthesizer for TX (transmission) (TX local oscillator), 6 is a frequency synthesizer for RX (reception) (local oscillator for RX), 7 is a signal synthesis means, and 8 is an energy detection means. , 9 is diversity control means, 10 is baseband signal processing means, 11 is overall control means, 12 is memory, 13 is input / output means, 14a and 14b are A / D (analog / digital) converters, and 20 is this embodiment. Mobile phone terminal device.

  In FIG. 1, a mobile phone terminal device 20 includes two antennas that receive the same CDMA radio waves from a base station (not shown) through different paths, that is, a transmission / reception antenna 1a and a reception-only antenna 1b. Yes. A CDMA RF (radio frequency) signal received by the transmission / reception antenna 1a is supplied to the reception means 4a via the transmission / reception wave selection filter 2, and is transmitted to a predetermined reception channel corresponding to the local oscillation signal from the RX frequency synthesizer 6. An RF signal is selected and frequency-converted directly into a baseband signal by a direct conversion (also called zero IF) method.

  Here, in the selected reception channel, a plurality of RF spread modulation signals including an RF spread modulation signal addressed to the cellular phone terminal device 20 (hereinafter referred to as a self-addressed spread modulation signal) are multiplexed. Each spread modulation signal is spread and modulated using a spread code assigned to the destination mobile phone terminal device 20, and by performing a despreading process using the spread code used for this spread modulation, Data is restored as playback data.

  This baseband signal is converted into a digital signal DDa by the A / D converter 14 a and then supplied to the signal synthesis means 7. The CDMA RF signal received by the reception-only antenna 1b is supplied to the receiving means 4a, and the RF signal of the predetermined reception channel corresponding to the local oscillation signal from the RX frequency synthesizer 6 is selected, and the direct conversion method. Thus, the frequency is directly converted into a baseband signal. This baseband signal is converted into a digital signal DDb by the A / D converter 14b and then supplied to the signal synthesis means 7. Here, the receiving means 4a and the receiving means 4b select the same receiving channel.

  In this embodiment, under the control of the overall control means 11, a diversity reception operation for combining the reception signals of the transmission / reception antenna 1a and the reception-dedicated antenna 1b and reproducing data, and reception signals of only the transmission / reception antenna 1a are performed. And a non-diversity receiving operation for performing data reproduction by using it. Switching between the diversity reception operation and the non-diversity reception operation is performed by the overall control unit 11 controlling the diversity control unit 9.

  When the diversity control means 9 supplies power to the receiving means 4b and operates the receiving means 4b by this control, the cellular phone terminal device 20 is in a diversity receiving operation state. The digital signal DDa of the predetermined reception channel output from the A / D converter 14a and the digital signal DDb of the same predetermined reception channel received by the reception antenna 1b and output from the A / D converter 14b are supplied to the signal synthesis means 7. However, when the diversity control means 9 stops the receiving means 4b in an idle state where power consumption is reduced or power supply is stopped (this state of the receiving means 4b is hereinafter referred to as an operation stop state), the cellular phone terminal device 20 is not It is in the state of diversity reception operation. It is received by the burner 1a only the digital signal DDa predetermined receiving channels output from the A / D converter 14a is supplied to the signal synthesis means 7.

  The signal synthesizing means 7 is composed of a despreading circuit and a finger circuit that despreads the supplied digital signal of the CDMA system using a spreading code, and a rake receiver that rake combines the output signal of the despreading circuit. It is provided for each of the digital signals DDa and DDb from the D converters 14a and 14b, and further includes a combining means for combining the outputs of these rake receivers.

  In the signal synthesizing means 7 having such a configuration, in the case of non-diversity reception operation, the digital signal DDa supplied from the A / D converter 14a is despread using the spreading code assigned by the cellular phone terminal device 20 in the despreading circuit. By processing, a spread modulation signal addressed to itself is extracted from the predetermined reception channel selected by the receiving means 4a, subjected to despreading processing, and rake-combined by the rake receiver, so that the spread modulation signal addressed to itself is extracted. Signal reproduction data is obtained. This reproduction data passes through the synthesizing means as it is, and is supplied to the baseband signal control means 10 as logical channel reproduction data DD.

  In the case of the diversity reception operation, the digital signals DDa and DDb supplied from the A / D converters 14a and 14b are despread using the spreading codes assigned by the cellular phone terminal device 20 in the respective despreading circuits. By spreading, a spread modulation signal addressed to itself is extracted for each predetermined reception channel (the same reception channel) selected by the receiving means 4a and 4b, and despreading processing is performed, and rake synthesis is performed by the rake receiver. Thus, reproduction data is obtained for each. These reproduction data are synthesized by the synthesizing means, and supplied to the baseband signal control means 10 as the logical channel reproduction data DD. In this way, in the case of diversity reception, since the reproduction data of the spread modulation signal addressed to itself received by the transmission / reception antenna 1a and the reception-only antenna 1b is synthesized, either one of the antennas 1a and 1b is combined. Even if the reception level decreases due to fading or the like, stable reception is possible.

  In the baseband signal control means 10, the reproduction data DD supplied from the signal synthesizing means 7 is demodulated into audio data, video data, etc., and the demodulated data is supplied to the input / output means 13 for audio output and image display by a speaker. An image is displayed on the device, and is output from an external input / output device to an external device (not shown). Of the received data, data related to call control is sent to the overall control means 11 and used for communication control. On the other hand, data related to transmission call control is sent from the overall control means 11 to the baseband signal processing means 10, converted into a predetermined communication data format, supplied to the transmission means 3, and output from the TX frequency synthesizer 5. As a result, a transmission signal of a predetermined channel is obtained and transmitted from the transmission / reception antenna 1a to the base station via the transmission / reception wave selection filter 2. Also, the audio signal from the microphone of the input / output means 13 and the data from the external device are converted into a predetermined communication data format by the baseband signal processing means 10, and similarly, the transmission means 3, the transmission / reception wave selection filter. 2 from the transmitting / receiving antenna 1a to the base station.

  The reproduction data output from the rake receiver in the signal synthesizing unit 7 is supplied to the energy detecting unit 8 to detect the reception energy C / I value of the received spread modulation signal addressed to itself at the present time. That is, at the time of non-diversity receiving operation, the signal combining means 7 despreads the digital signal DDa and the reproduction data of the spread modulation signal addressed to the self obtained by rake combining by the rake receiver is supplied to the energy detecting means 8. Then, a received energy C / I value (hereinafter referred to as “one antenna received energy value”) is detected. This one-channel received energy C / I value is the received energy C / I value of the spread modulation signal addressed to itself at the time of non-diversity reception. Further, during the diversity reception operation, the signal combining means 7 despreads the digital signals DDa and DDb, and the reproduction data obtained by the rake combination by the rake receiver is supplied to the energy detection means 8, and these reproduction data are supplied. Received energy C / I values are detected and combined. The combined value of the received energy C / I values (hereinafter referred to as combined received energy C / I value) is the received energy C / I value of the spread modulation signal addressed to itself during the diversity reception operation.

  The received energy C / I values at the time of non-diversity reception and diversity reception detected by the energy detection means 8 in this way are supplied to the overall control means 11. More specifically, the overall control unit 11 can determine whether the mobile phone terminal device 20 is currently in a non-diversity reception operation state or in a diversity reception operation state, and at the time of non-diversity reception, from the antenna 1a. The received energy C / I value of the received data is taken in, and at the time of diversity reception, the 1-channel received energy C / I value of the received data from the antenna 1a and the combined received energy C / I value are taken in.

  Here, the overall control means 11 includes a memory 12, and this memory 12 is used as a storage area for a program executed by the overall control means 11 and a work area when the overall control means 11 performs data processing. In addition, a conversion table indicating the correspondence between the received energy C / I value and the receivable data rate is provided. The overall control unit 11 uses this conversion table in the memory 12 to obtain a receivable data rate for the received energy C / I value obtained by the energy detection unit 8.

  FIG. 2 is a diagram schematically showing a specific example of the conversion table stored in the memory 12.

  In this figure, in this conversion table, the possible range of the received energy C / I value (detection result C / I value) detected by the energy detection means 8 is divided into a plurality of stages (9 stages in FIG. 2). The receivable data rate is defined for each stage. When the reception energy C / I value is detected from the energy detection means 8, the overall control means 11 takes it in and obtains a receivable data rate based on this conversion table. For example, if the reception energy C / I value detected by the energy detection means 8 is 7 dB, the receivable data rate is 1 Mbps. The higher the received energy C / I value, the higher the receivable data rate is set.

  When the overall control means 11 obtains the receivable data rate in this way, the data rate of data from a base station (not shown) is equal to the receivable data rate in accordance with the obtained receivable data rate. In the case where they are equal, the base station is requested to perform data transmission using the receivable data rate as the transmission data rate. For this purpose, the overall control means 11 sends the received receivable data rate to the baseband signal control means 10. The baseband signal control means 10 generates DRC (Data Rate Control) information according to the receivable data rate under the control of the overall control means 11, and transmits the transmission means 3 and transmission / reception selection. Transmission is performed from the transmission / reception antenna 1 a via the filter 2. Upon receiving this data transmission request, the base station sets the data rate of transmission data to the mobile phone terminal device 20 to the receivable data rate. Further, the overall control unit 11 stores the receivable data rate in the memory 12 as the current data communication reception data rate (hereinafter referred to as the current reception data rate).

  When the overall control unit 11 obtains a receivable data rate from the received energy C / I value detected by the energy detection unit 8, the overall control unit 11 determines whether the reception operation of the mobile phone terminal device 20 is non-diversity reception or diversity. Judge whether to receive. If it is determined that the non-diversity reception is in the diversity reception operation state, the overall control unit 11 controls the diversity control unit 9 to switch the reception unit 4b from the operation state to the operation stop state. As a result, the reception state by only the reception unit 4a is set, and the non-diversity state is set. If it is determined that non-diversity reception is in the non-diversity reception operation state, the overall control unit 11 controls the diversity control unit 9 to switch the reception unit 4b from the operation stop state to the operation state. As a result, in addition to the receiving means 4a, the receiving means 4b is also in a receiving state, and is in a diversity receiving operation state.

  FIG. 3 is a flowchart showing a specific example of the above control procedure of the overall control means 11.

  In this figure, the current data rate stored in the memory 12 is now DRb (step 31), the energy detection means 8 detects the reception energy C / I value, and the one-channel reception energy C / I value is obtained. When supplied, this 1-channel received energy C / I value is taken in and the corresponding 1-channel received data rate DRm is obtained based on the conversion table in the memory 12 (step 32). Then, it is determined whether the diversity reception operation is currently being performed or the non-diversity reception is being performed (step 33).

  Therefore, if it is assumed that it is in the diversity reception operation state, the combined reception energy C / I value DRdiv is fetched from the energy detection means 8 (in the diversity reception operation state, the combined reception energy C / I value is also as described above. Based on the conversion table in the memory 12, the corresponding combined reception data rate DRdiv is obtained (step 34).

Then, the one-channel reception data rate DRm and the combined reception data rate DRdiv are compared,
DRdiv ≤ DRm
In the present situation, it is possible to use a higher receivable data rate when receiving only by the receiving means 4a than when receiving diversity (step 35). The current reception data rate DRb is set in the memory 12 (step 36), and the diversity control means 9 is controlled to switch the reception means 4b from the operating state to the non-operating state, thereby setting the non-diversity receiving operation state (step 37). Then, the process returns to step 32 (step 38). On the other hand
DRdiv> DRm
In the present situation, the diversity reception can use a higher receivable data rate than the reception means 4a alone (step 35). The reception data rate DRb is set in the memory 12 (step 39), and the process returns to step 32 while maintaining the current diversity reception state (step 40).

When the reception state of the mobile phone terminal 20 is a non-diversity reception operation state (step 33), the current reception data rate DRb stored in the memory 12 is compared with the one-channel reception data rate DRm obtained in step 32. ,
DRm ≧ DRb
In the present situation, the newly obtained 1-channel reception data rate DRm is higher than the current reception data rate DRb stored in the memory 12 (step 41). This one-channel reception data rate DRm is set as the current reception data rate DRb in the memory 12 (step 42), and the process returns to step 32 while maintaining the current non-diversity reception state (step 43). On the other hand
DRm <DRb
, The current reception data rate DRb stored in the memory 12 is a higher receivable data rate than the newly obtained one-channel reception data rate DRm (step 41). Receivable data rate is low. For this reason, the diversity control means 9 is controlled to switch the reception means 4b from the operation stop state to the operation state, thereby setting the diversity reception operation state (step 44). Then, the process returns to step 32 (step 45).

  The memory 12 also stores information indicating the reception state of the diversity reception state or the non-diversity reception state of the mobile phone terminal device 20. In step 37, the reception circuit 4b is switched to the operation stop state. The information is rewritten from the information indicating the diversity reception state to the information indicating the non-diversity reception state. In step 44, the reception circuit 4b is switched to the operation state, and this information is expressed from the information indicating the non-diversity reception state to the diversity reception state. Rewrite information. With this information, the overall control unit 11 can determine the reception state of the mobile phone terminal device 20.

  Alternatively, a command signal to the diversity control means 9 for turning on / off the receiving means 4b by the overall control means 11 is also held in the memory 12, and the state of the receiving means 4b is detected by this command signal, so that the mobile phone terminal The reception state of the device 20 may be determined.

  In this way, in this embodiment, it is possible to maintain high call quality that is not easily affected by interference waves without reducing the reception data rate, and to reduce power consumption, thereby improving the quality of the mobile phone terminal device. The use time can be improved.

  FIG. 4 is a block diagram showing a second embodiment of a cellular phone terminal device according to the present invention, 15 is a reception level detecting means, and the same reference numerals are given to the portions corresponding to FIG. Omitted.

  In the figure, the cellular phone terminal device 20 of the second embodiment is obtained by adding a reception level detecting means 15 to the cellular phone terminal device 20 shown in FIG. The reception level detection means 15 detects the received electric field strength (RSSI) of the physical channel currently received from the detection signal of the reception means 4a and compares it with the threshold set by the overall control means 11, and the comparison result The diversity control means 9, and therefore the reception means 4b are controlled accordingly.

  When the reception level is lowered due to fading or the like in the non-diversity reception operation state, the reception signal from the reception unit 4a is deteriorated. The level of the received signal is detected by the reception level detecting means 15 and compared with a threshold value. When this detection level value falls below the threshold value, the reception signal has deteriorated, and the reception level detection means 15 supplies a control signal to the diversity control means 9. Thereby, the receiving means 4b switches to an operation state. As a result, the cellular phone terminal device 20 enters the diversity reception operation state, and the reception-only antenna 1b receives radio waves on a different path from the transmission / reception antenna 1a, and therefore is not affected by fading at the same time.

  As described above, in the second embodiment, it is possible to maintain high call quality and reduce power consumption without causing a decrease in reception data rate and even when a sudden decrease in reception level occurs. Thus, the quality of the mobile phone terminal device can be improved and the usage time can be improved.

It is a block diagram which shows 1st Embodiment of the mobile telephone terminal device by this invention. It is a figure which shows one specific example of the conversion table stored in the memory in FIG. It is a flowchart which shows a specific example of the control procedure of 1st Embodiment shown in FIG. It is a block diagram which shows 2nd Embodiment of the mobile telephone terminal device by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Transmission / reception antenna 2 Transmission / reception wave selection filter 3 Transmission means 4a, 4b Reception means 5 Transmission frequency synthesizer 6 Reception frequency synthesizer 7 Signal synthesis means 8 Reception energy detection means 9 Diversity switching control means 10 Baseband processing means 11 Overall control means 12 Memory 13 Input / output means 14a, A / D converter 15 Reception level detection means 20 Mobile phone terminal device

Claims (5)

  1. In a mobile phone terminal device that communicates with a base station using a code division multiple access method,
    First receiving means for receiving transmission data from the base station by a transmission / reception antenna;
    Second receiving means for receiving transmission data from the base station by a reception-only antenna;
    Signal synthesizing means for synthesizing the received signals of the first and second receiving means;
    A reception energy detection means for detecting a reception energy C / I value related to its own communication using reception signals of the first and second reception means;
    The switching control of the operation / non-operation state of the second receiving means is performed to switch between the diversity receiving operation in which the first and second receiving means operate and the non-diversity receiving operation in which only the first receiving means operates. Diversity control means to perform,
    The diversity control means is controlled in accordance with the received energy C / I value detected by the received energy detection means, and the second receiving means is changed from the operating state to the non-operating state, or from the non-operating state to the operating state. And a control unit for switching.
  2. The mobile phone terminal device according to claim 1, wherein
    The reception energy detection means uses the reception signal of the first reception means to obtain a first reception energy C / I value, and uses the reception signal of the second reception means to obtain a second reception energy C / I. Detecting each value and generating a combined received energy C / I value obtained by combining the first and second received energy C / I values;
    The control means switches to the diversity reception operation state by controlling the diversity control means according to the first received energy C / I value during the non-diversity reception operation, and during the diversity reception operation, Switching to the non-diversity reception operation state by controlling the diversity control means in accordance with the first reception energy C / I value and the combined reception energy C / I value. .
  3. The mobile phone terminal device according to claim 2, wherein
    A memory having a conversion table for converting the received energy C / I value into a corresponding receivable data rate;
    Based on the conversion table, the control means converts the first received energy C / I value captured from the received energy detection means to a first receivable data rate, and the combined received energy C / I value. Is converted into a second receivable data rate, and the diversity control means is controlled when the first receivable data rate is smaller than the current receivable data rate during the non-diversity reception operation. By switching to the diversity reception operation state, and controlling the diversity control means when the first receivable data rate is larger than the second receivable data rate during the diversity reception operation. And switching to the non-diversity reception operation state.
  4. In the mobile phone terminal device according to claim 1, 2, or 3,
    The signal combining means outputs a combined signal of the received signals of the first and second receiving means during the diversity receiving operation, and outputs a received signal of the first receiving means during the non-diversity receiving operation. A mobile phone terminal device.
  5. The mobile phone terminal device according to any one of claims 1 to 4,
    A reception level detection unit that detects a reception level of the reception signal of the first reception unit and outputs a control signal when the detected reception level is smaller than a predetermined threshold;
    The diversity control means switches the second receiving means from an operating state to a non-operating state or from a non-operating state to an operating state in accordance with the control signal output from the reception level detecting means. Mobile phone terminal device.
JP2004159236A 2004-05-28 2004-05-28 Cellular phone terminal device Pending JP2005341366A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006094364A (en) * 2004-09-27 2006-04-06 Kyocera Corp Mobile communication terminal and data-receiving method of the mobile communication terminal
WO2007129381A1 (en) * 2006-04-28 2007-11-15 Fujitsu Limited Mobile unit using w-cdma scheme having reception diversity function, and system therefor
JP2009033532A (en) * 2007-07-27 2009-02-12 Sharp Corp Communications equipment, communication method, and program
JP2009213052A (en) * 2008-03-06 2009-09-17 Sumitomo Electric Ind Ltd Wireless communication apparatus
JP2010206357A (en) * 2009-03-02 2010-09-16 Fujitsu Ltd Radio transmitting and receiving apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006094364A (en) * 2004-09-27 2006-04-06 Kyocera Corp Mobile communication terminal and data-receiving method of the mobile communication terminal
JP4566671B2 (en) * 2004-09-27 2010-10-20 京セラ株式会社 Mobile communication terminal and data reception method for mobile communication terminal
WO2007129381A1 (en) * 2006-04-28 2007-11-15 Fujitsu Limited Mobile unit using w-cdma scheme having reception diversity function, and system therefor
US8711827B2 (en) 2006-04-28 2014-04-29 Fujitsu Limited Mobile terminal based on W-CDMA system having receive diversity function and system thereof
JP2009033532A (en) * 2007-07-27 2009-02-12 Sharp Corp Communications equipment, communication method, and program
JP2009213052A (en) * 2008-03-06 2009-09-17 Sumitomo Electric Ind Ltd Wireless communication apparatus
JP2010206357A (en) * 2009-03-02 2010-09-16 Fujitsu Ltd Radio transmitting and receiving apparatus

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