JP4781993B2 - Wireless communication terminal and control method thereof - Google Patents

Description

  The present invention relates to a wireless communication terminal and a control method thereof.

  In recent years, there are a plurality of systems corresponding to respective standards in wireless communication terminals such as mobile phones. For example, the TDMA system and the CDMA system are widely used in Japanese mobile phone systems.

  Normally, a wireless communication terminal is configured to correspond to any one of the standards. For example, in the mobile phone system, the frequency band assigned to each system is becoming tight as the terminal spreads. To multiband is considered. In addition, in order to provide a stable and highly functional service, handoff between different frequency bands and multiband / multimode communication using a plurality of communication systems are also performed.

  As a wireless communication terminal compatible with such multiband / multimode, for example, a TDMA system and a CDMA system are combined, a TDMA transmission / reception unit and a CDMA transmission unit are coupled to a primary antenna, and a CDMA system is coupled to a secondary antenna. There is known a wireless communication terminal in which two receiving units are combined (for example, see Patent Document 1).

  Recently, a multi-band / multi-mode wireless communication terminal equipped with two communication systems of a cdma2000 1xEV-DO system and a cdma2000 1x system has been considered.

  FIG. 10 is a functional block diagram showing a schematic configuration of a main part of a wireless communication terminal equipped with two communication systems of the cdma2000 1xEV-DO system and the cdma2000 1x system. This wireless communication terminal includes a 1x communication system based on a cdma2000 system in the 800 MHz band (hereinafter abbreviated as 800 MHz band as appropriate) and a cdma2000 system in 2 GHz band (hereinafter abbreviated as 2 GHz band as appropriate), 1xEV-DO ( In the following, the communication system is simply referred to as EVDO as appropriate, and has a GPS frequency reception function of 1575.42 MHz (hereinafter appropriately abbreviated as 1.5 GHz band), and has a modulation circuit and a demodulation circuit. A transmission unit (Tx) 101, a primary reception unit (primary Rx) 102, and a secondary reception unit (secondary Rx) 103 connected to the baseband unit 100 are provided.

  The transmitter 101 and the primary receiver 102 are connected to the primary antenna 105 via the duplexer 104, and can transmit and receive in the 800 MHz band and the 2 GHz band. The secondary receiving unit 103 is connected to the secondary antenna 106 and can receive signals in the 800 MHz band, the 2 GHz band, and the 1.5 GHz band independently of the primary receiving unit 102. Since the secondary antenna 106 receives three bands of 800 MHz band, 2 GHz band, and 1.5 GHz band, compared with the primary antenna 105 that transmits and receives two bands of 800 MHz band and 2 GHz band, the antenna gain of 800 MHz band and 2 GHz band Is generally low. For example, as shown in FIG. 11, the antenna gain in the 800 MHz band and 2 GHz band of the primary antenna 105 is −3 dBi and 0 dBi, respectively, whereas the antenna gain in the 800 MHz band and 2 GHz band of the secondary antenna 106 is respectively It is −10 dBi and −3 dBi. For this reason, the secondary receiving unit 103 has a lower paging capture capability from the base station than the primary receiving unit 102.

Therefore, conventionally, as shown in FIG. 10, the actual reception sensitivity received by the primary reception unit 102 or the secondary reception unit 103 and input to the baseband unit 100 and the threshold value of the reception sensitivity stored in the threshold memory 107 in advance. Are switched by the mode switching unit 108, and the primary reception unit 102 and the secondary reception unit 103 are controlled to be switched according to the reception environment.
JP 2004-15162 A

  In the wireless communication terminal having the functions of the 1x system and the EVDO system described above, information necessary for communication with the base station is transmitted to the base station using an access channel (Access Channel). The transmission by the access channel performs the first transmission with the initial transmission power, and when no acknowledgment (Ack) is received from the base station for this transmission, after a predetermined time, the transmission power is adjusted and the transmission is repeated. In a wireless communication terminal having a function of both 1x system and EVDO system until an acknowledgment is received from the base station or repeated access attempts are made a predetermined number of times, one of the systems is a transmitter (Tx) is occupied. FIG. 12 is a diagram illustrating transmission through an access channel in the above-described conventional wireless communication terminal. As shown in the figure, there is an access processing request to the 1x system, and there is an access processing request to the EVDO system while the 1x system occupies the transmission unit (Tx) and performs access processing by the access channel. When the Ack signal of the 1x system is received and the transmission in the 1x system is completed, the EVDO system occupies the transmission unit (Tx) and performs access processing through the access channel. In this way, in the above-described wireless communication terminal, when one system is transmitting, the other system waits until the transmission of one system is completed before performing the transmission, so the transmission time lag is small. There is a problem that occurs. As another method, there is a method in which transmission of one system is stopped and transmission of the other system is performed. However, the stopped system has to perform transmission again after transmission of the other system.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a wireless communication terminal in which no time lag occurs when two wireless communication systems attempt to transmit simultaneously on an access channel, and It is to provide a control method.

  In order to achieve the above object, the present invention performs an initial transmission with initial transmission power to attempt to gain access to the system, and if no acknowledgment is received from the base station for the transmission, After a period of time, the transmission power is adjusted and repeated transmission is performed, and the access processing to the system is continued until an acknowledgment is received from the base station for the transmission or until the repeated access attempts are performed a predetermined number of times. A wireless communication terminal compatible with the first wireless communication system and the second wireless communication system, capable of transmitting and receiving information by the first wireless communication system and the second wireless communication system, and the first wireless communication Receiving means capable of receiving information by the system and the second wireless communication system, the first wireless communication system and the second wireless communication system When the access processing to the communication system is duplicated, the transmission / reception means receives the acknowledgment of the wireless communication system that started the access processing first, and the reception of the acknowledgment of the wireless communication system that started the access processing later And control means for controlling to be performed by the means.

  Preferably, the control means performs control so that the transmission / reception means receives an acknowledgment of the wireless communication system that has started the access process after the access process of the wireless communication system that has started the access process is completed.

  The present invention also performs an initial transmission with initial transmission power to attempt to gain access to the system, and if no acknowledgment is received from the base station for the transmission, after a predetermined time, the transmission A first wireless communication system that performs transmission repeatedly while adjusting power and continues access processing to the system until an acknowledgment is received from the base station for the transmission or until the repeated access attempts are made a predetermined number of times And a method of controlling a wireless communication terminal compatible with the second wireless communication system, wherein when the first wireless communication system is performing access processing, when receiving an access processing request to the second wireless communication system, When the transmission timing of each system is determined and the transmission timing of each system is different, the system waits for the next transmission of the first wireless communication system. During the predetermined time is a time, and controlling to perform a transmission of the second radio communication system.

  The present invention also performs an initial transmission with initial transmission power to attempt to gain access to the system, and if no acknowledgment is received from the base station for the transmission, after a predetermined time, the transmission A first wireless communication system that performs transmission repeatedly while adjusting power and continues access processing to the system until an acknowledgment is received from the base station for the transmission or until the repeated access attempts are made a predetermined number of times And a method of controlling a wireless communication terminal compatible with the second wireless communication system, wherein when the first wireless communication system is performing access processing, when receiving an access processing request to the second wireless communication system, The transmission timing of each system is determined, and when the transmission timing of each system is the same, the access processing to the second wireless communication system is opened. In addition, the transmission of the second wireless communication system is stopped to give priority to the transmission of the first wireless communication system, and when the access process of the first wireless communication system is completed, the transmission of the second wireless communication system is started. It is characterized by doing.

  According to the present invention, when two wireless communication systems try to perform transmission on the access channel at the same time, transmission on the access channel can be performed at the same time, so that a transmission time lag can be eliminated.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram showing a schematic configuration of an access channel transmission unit of a wireless communication terminal according to the present invention. Similarly to FIG. 10, the wireless communication terminal according to the present embodiment has a 1 × system based on the 800 MHz band and the 2 GHz band, and an EVDO system, and also has a function of receiving a GPS frequency in the 1.5 GHz band. In FIG. 1, a transmission unit 1 and a primary reception unit 2 which are transmission / reception means can perform transmission / reception in the 800 MHz band and the 2 GHz band, and can transmit and receive information by the 1x system and the EVDO system. The secondary receiving unit 3 that is a receiving means can receive in the 800 MHz band, 2 GHz band, and 1.5 GHz band independently of the primary receiving unit 2, and can receive information by the 1x system and the EVDO system. It has become. The secondary antenna connected to the secondary receiving unit 3 has a lower antenna gain than the primary antenna connected to the primary receiving unit 2.

  If the 1x system and the EVDO system attempt to gain access to the system, make an initial transmission with an initial transmission power using the access channel and no acknowledgment is received from the base station for this transmission, After a predetermined time, the transmission power is adjusted and repeated transmission is performed. Until an acknowledgment is received from the base station for this transmission, or until the repeated access attempt (AccessAttempt) is performed a predetermined number of times, Continue the access process.

  The access channel transmission unit of the wireless communication terminal shown in FIG. 1 generates an EVDO access channel signal by receiving the EVDO protocol control unit 8 that outputs the EVDO access channel transmission request command and the EVDO transmission / reception request command, and the EVDO access channel transmission request command. EVDO transmission control unit 6 that performs, 1x protocol control unit 9 that outputs a 1x access channel transmission request command and 1x transmission / reception request command, and 1x transmission control unit 7 that receives the 1x access channel transmission request command and generates a 1x access channel signal And control the transmission timing of the access channel signal for each communication system, and output the EVDO and / or 1x access channel signal to the transmission unit 1, and the EVDO and / or 1x transmission / reception request command The primary reception unit receives the EVDO and / or 1x transmission / reception request command from the access channel transmission control unit 5, the access channel transmission control unit 5, the EVDO protocol control unit 8, and the 1x protocol control unit 9 that outputs to the reception antenna control unit 4. 2 or a secondary reception unit 3 and a reception antenna control unit (control means) 4 that allocates reception of signals of the EVDO system or 1x system.

  When receiving the EVDO access channel transmission request command from the EVDO protocol control unit 8, the EVDO transmission control unit 6 outputs an EVDO access channel signal to the access channel transmission control unit 5. At this time, since the 1x access channel signal is not input from the 1x transmission control unit 7, the access channel transmission control unit 5 outputs only the EVDO access channel signal to the transmission unit 1. In addition, when receiving antenna control unit 4 receives an EVDO transmission request command from access channel transmission control unit 5 and EVDO protocol control unit 8, receiving antenna control unit 4 assigns primary receiving unit 2 to receive the signal of the EVDO system. At this time, the 1x reception request command from the 1x protocol control unit 9 is ignored.

  FIG. 2 is a diagram illustrating an operation when there is an access channel transmission request from the 1x system. When receiving the 1x access channel transmission request command from the 1x protocol control unit 9, the 1x transmission control unit 7 outputs a 1x access channel signal to the access channel transmission control unit 5. At this time, since the EVDO access channel signal is not input from the EVDO transmission control unit 6, the access channel transmission control unit 5 outputs only the 1x access channel signal to the transmission unit 1. Further, when receiving the 1x transmission request command from the access channel transmission control unit 5 and the 1x protocol control unit 9, the reception antenna control unit 4 assigns the primary reception unit 2 to receive the signal of the 1x system. At this time, the EVDO reception request command from the EVDO protocol control unit 8 is ignored.

  FIG. 3 is a diagram illustrating an operation when there is an access channel transmission request from the 1x system during transmission of an EVDO access channel signal. In the state of FIG. 1, that is, in the state where the EVDO access channel signal is output from the access channel transmission control unit 5 to the transmission unit 1 and the reception of the signal of the EVDO system is assigned to the primary reception unit 2 as shown in FIG. Thus, when the 1x transmission control unit 7 receives the 1x access channel transmission request command from the 1x protocol control unit 9 and outputs the 1x access channel signal to the access channel transmission control unit 5, the access channel transmission control unit 5 Timing control with the access channel signal is performed, and the EVDO access channel signal and the 1x access channel signal are output to the transmitter 1.

  When receiving the 1x transmission request command from the access channel transmission control unit 5 and the 1x protocol control unit 9, the reception antenna control unit (control unit) 4 assigns the secondary reception unit 3 to receive the signal of the 1x system. As described above, the reception antenna control unit (control unit) 4 receives the acknowledgment of the system that started the access process first when the access process (transmission of access channel signal) to the EVDO system and the 1x system overlaps. The primary reception unit 2 connected to the primary antenna having a high antenna gain is controlled so that the secondary reception unit 3 receives the acknowledgment of the system that has started the access process later.

  FIG. 4 is a diagram illustrating an operation when transmission of the EVDO access channel signal is completed during simultaneous transmission of the EVDO access channel signal and the 1x access channel signal. When the EVDO access channel transmission request from the EVDO protocol control unit 8 to the EVDO transmission control unit 6 disappears, the EVDO access channel signal is not output from the EVDO transmission control unit 6 to the access channel transmission control unit 5, and the access channel transmission control unit 5 Since only the 1x access channel signal is input, the access channel transmission control unit 5 outputs only the 1x access channel signal to the transmission unit 1.

  In addition, the reception antenna control unit (control means) 4 stops the EVDO transmission request command from the access channel transmission control unit 5 and the EVDO protocol control unit 8 and transmits 1x transmission from the access channel transmission control unit 5 and the 1x protocol control unit 9. Since the request command is received, the primary receiver 2 is switched from receiving the signal of the EVDO system to receiving the signal of the 1x system. At this time, the EVDO reception request command from the EVDO protocol control unit 8 is ignored. Thus, when the access process of the system that first started the access process (access channel signal transmission) is completed, the reception antenna control unit (control unit) 4 receives the acknowledgment of the system that started the access process later. Control is performed so as to be performed by the primary receiver 2 connected to the primary antenna having a high antenna gain.

  FIG. 5 is a diagram illustrating transmission through the access channel when the transmission timings of the systems are different. As shown in the figure, there is an access processing request (access channel transmission request command) to the EVDO system, and the EVDO system performs access processing (access channel signal transmission) using the access channel. When the access processing request is received, the access channel transmission control unit 5 determines the transmission timing of each system, and when the transmission timing of each system is different, the access channel transmission control unit 5 is a predetermined time that is a waiting time for the next transmission of the EVDO system. In the meantime, the 1x system performs access processing using the access channel.

  FIG. 6 is a diagram illustrating transmission through the access channel when the transmission timings of the respective systems are the same. As shown in the figure, when there is an access processing request to the EVDO system and the EVDO system is performing access processing using the access channel, if an access processing request to the 1x system is received, the access channel transmission control unit 5 Determines the transmission timing of each system, and when the transmission timing of each system is the same, starts the access processing to the 1x system and skips the transmission of the 1x system that has been requested later (skips processing) The transmission of the EVDO system is prioritized, and when the EVDO system access process is completed, the transmission of the 1x system is started.

  FIG. 7 is a sequence diagram when there is an access channel transmission request from the 1x system during transmission of the EVDO access channel signal. When EVDO protocol control unit 8 transmits an EVDO access channel transmission request command to EVDO transmission control unit 6, EVDO transmission control unit 6 outputs an EVDO access channel signal to access channel transmission control unit 5. The access channel transmission control unit 5 performs transmission control and outputs an EVDO access channel signal to the transmission unit 1. When the EVDO protocol control unit 8 transmits an EVDO transmission request command to the reception antenna control unit 4, the reception antenna control unit 4 switches the reception antenna and allocates reception of the EVDO system signal to the primary reception unit 2.

  Next, when the 1x protocol control unit 9 transmits a 1x access channel transmission request command to the 1x transmission control unit 7, the 1x transmission control unit 7 outputs a 1x access channel signal to the access channel transmission control unit 5. The access channel transmission control unit 5 performs transmission control and outputs a 1x access channel signal to the transmission unit 1. When the 1x protocol control unit 9 transmits a 1x transmission request command to the reception antenna control unit 4, the reception antenna control unit 4 switches the reception antenna and assigns the secondary reception unit 3 to receive the signal of the 1x system.

  FIG. 8 is a flowchart of the access channel transmission control unit. When there is an access channel signal input (step 100), the access channel transmission control unit determines whether the access channel signal is an EVDO access channel signal or a 1x access channel signal (step 110). In the case of a 1x access channel signal, it is determined whether or not 1x transmission is being performed (step 120), and if 1x transmission is being performed, the process ends. If 1x transmission is not performed, it is determined whether transmission of the EVDO access channel signal is performed (step 130). If transmission of the EVDO access channel signal is performed, the EVDO access channel signal is And the 1x access channel signal is output to the transmitter (step 140). If the EVDO access channel signal is not transmitted, the 1x access channel signal is output to the transmitter without timing control (step 170).

  In step 110, if the access channel signal is an EVDO access channel signal, it is determined whether EVDO transmission is being performed (step 150), and if EVDO transmission is being performed, the process ends. If EVDO transmission is not performed, it is determined whether or not transmission of 1x access channel signal is performed (step 160). If transmission of 1x access channel signal is performed, 1x access channel signal and And the EVDO access channel signal is output to the transmitter (step 140). If the 1x access channel signal is not transmitted, the EVDO access channel signal is output to the transmitter without timing control (step 170).

  FIG. 9 is a flowchart of the receiving antenna control unit. When receiving a transmission request command (step 200), the receiving antenna control unit determines whether it is an EVDO transmission request command or a 1x transmission request command (step 210). In the case of a 1x transmission request command, it is determined whether or not 1x transmission is being performed (step 220), and if 1x transmission is being performed, the process ends. If 1x transmission is not performed, it is determined whether EVDO transmission is performed (step 230). If EVDO transmission is performed, 1x reception is assigned to the secondary receiver (receiver) 3. (Step 240). If EVDO transmission is not performed, 1x reception is assigned to the primary receiver (receiver) 2 (step 270).

  In step 210, if the transmission request command is an EVDO transmission request command, it is determined whether EVDO transmission is being performed (step 250), and if EVDO transmission is being performed, the process ends. When the EVDO transmission is not performed, it is determined whether or not the 1x transmission is performed (step 260). When the 1x transmission is performed, the EVDO reception is assigned to the secondary reception unit 3 (step 240). . If 1x transmission is not performed, EVDO reception is assigned to the primary receiver 2 (step 270).

As described above, according to the present invention, when two systems try to perform transmission on the access channel at the same time, transmission on the access channel can be performed at the same time, so that a transmission time lag can be eliminated.
Until now, registration of the 1x system could not be performed when the connection of the EVDO system was established, but registration can now be performed, and the EVDO traffic is interrupted and the incoming call or SMS (1x system SMS ( Short message service) can be received normally.
In addition, when updating the terminal identifier (UATI) due to the color code of the EVDO system being updated, it is highly possible that a 1x system handoff has occurred, and transmission of an access channel signal can be performed at the same time. If so, the time required for registration completion or UATI update is reduced.

It is a functional block diagram which shows schematic structure of the access channel transmission part of the radio | wireless communication terminal of this invention. It is a figure which shows operation | movement when there is an access channel transmission request from 1x system. It is a figure which shows operation | movement when there exists an access channel transmission request from 1x system during transmission of an EVDO access channel signal. It is a figure which shows operation | movement when transmission of an EVDO access channel signal is completed during simultaneous transmission of an EVDO access channel signal and a 1x access channel signal. It is a figure which shows the transmission by an access channel when the transmission timings of each system differ. It is a figure which shows transmission by the access channel in case the transmission timing of each system is the same. It is a sequence diagram when there is an access channel transmission request from the 1x system during transmission of the EVDO access channel signal. It is a flowchart of an access channel transmission control part. It is a flowchart of a receiving antenna control part. It is a functional block diagram which shows schematic structure of the conventional radio | wireless communication terminal. It is a figure which shows the gain of a primary antenna and a secondary antenna. It is a figure which shows the transmission by the access channel in the conventional radio | wireless communication terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission part 2 Primary reception part 3 Secondary reception part 4 Reception antenna control part 5 Access channel transmission control part 6 EVDO transmission control part 7 1x transmission control part 8 EVDO protocol control part 9 1x protocol control part

Claims (4)

In order to attempt to gain access to the system, perform an initial transmission with initial transmission power, and if no acknowledgment is received for the transmission from the base station, after a predetermined time, adjust the transmission power and repeat A first radio communication system and a second radio communication system that perform transmission and continue access processing to the system until an acknowledgment is received from the base station for the transmission or until the repeated access attempts are performed a predetermined number of times. A wireless communication terminal compatible with
Transmitting / receiving means capable of transmitting / receiving information by the first wireless communication system and the second wireless communication system;
Receiving means capable of receiving information by the first wireless communication system and the second wireless communication system;
When access processing to the first radio communication system and the second radio communication system overlaps, the transmission / reception means receives the acknowledgment of the radio communication system that started the access processing first, and then starts the access processing later Control means for controlling the reception means to receive an acknowledgment in a wireless communication system;
A wireless communication terminal.   The control means performs control so that the transmission / reception means receives an acknowledgment of the wireless communication system that has started the access process after the access process of the wireless communication system that has started the access process is completed. The wireless communication terminal according to claim 1. In order to attempt to gain access to the system, perform an initial transmission with initial transmission power, and if no acknowledgment is received for the transmission from the base station, after a predetermined time, adjust the transmission power and repeat A first radio communication system and a second radio communication system that perform transmission and continue access processing to the system until an acknowledgment is received from the base station for the transmission or until the repeated access attempts are performed a predetermined number of times. A method of controlling a wireless communication terminal corresponding to
When the first wireless communication system is performing access processing, when receiving an access processing request to the second wireless communication system, the transmission timing of each system is determined, and when the transmission timing of each system is different, A control method for a radio communication terminal, wherein control is performed so that transmission of the second radio communication system is performed during the predetermined time which is a waiting time for the next transmission of the first radio communication system. In order to attempt to gain access to the system, perform an initial transmission with initial transmission power, and if no acknowledgment is received for the transmission from the base station, after a predetermined time, adjust the transmission power and repeat A first radio communication system and a second radio communication system that perform transmission and continue access processing to the system until an acknowledgment is received from the base station for the transmission or until the repeated access attempts are performed a predetermined number of times. A method of controlling a wireless communication terminal corresponding to
When the first wireless communication system is performing access processing, upon receiving an access processing request to the second wireless communication system, the transmission timing of each system is determined, and when the transmission timing of each system is the same, The access processing to the second wireless communication system is started, the transmission of the second wireless communication system is skipped, the transmission of the first wireless communication system is prioritized, and the access processing of the first wireless communication system ends. Then, the wireless communication terminal control method starts transmission of the second wireless communication system.

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