JP4369943B2 - Wireless communication terminal and control method - Google Patents

Description

  The present invention relates to a wireless communication terminal and a control method in a hybrid wireless communication terminal that performs communication by switching between two communication systems.

2. Description of the Related Art A dual type wireless communication terminal capable of performing communication with a base station by switching between two communication systems is known.
JP-A-9-172675

   In the above-described dual wireless communication terminal, a device capable of measuring the wireless communication state of the other communication method and monitoring incoming calls during communication using one communication method is particularly called a hybrid method.

  In this hybrid wireless communication terminal, in particular, a hybrid wireless communication terminal of a cdma2000 1x system mainly for voice communication and a 1xEVDO system dedicated to data communication is provided with an antenna to enable each system to wait simultaneously. The radio unit is switched to each system at a predetermined interval, and the radio wave condition in each system and the incoming call from the base station are monitored. This system monitoring interval is defined in each system, and the wireless communication terminal performs timing adjustment with the base station so that the monitoring interval of the cdma2000 1x system and the monitoring interval of the 1xEVDO system do not overlap ( (See FIG. 2). At this time, when system monitoring is performed in one system, the antenna and the radio unit are occupied, and thus the other system cannot be monitored.

  Here, when the idle handoff (handoff in the standby state) due to the deterioration of the radio wave state occurs on the cdma2000 1x system side and the base station to be monitored changes, the system monitoring timing may change. In this case, the wireless communication terminal needs to change the monitoring timing on the 1xEVDO system side so that the monitoring timings of the two systems do not overlap. At this time, since the 1xEVDO system communicates with the base station to change the monitoring timing, the antenna and the radio unit are occupied by the 1xEVDO system. By the way, the 1xEVDO system considers that disconnection due to momentary radio wave interruption occurs during communication, and for a certain period of time after the completion of communication processing with the base station, the incoming signal from the base station can be received or measured. stand by.

  For this reason, the antenna and the radio unit are occupied by the 1xEVDO system for a certain period from the end of communication. Therefore, the cdma2000 1x system cannot detect an incoming call while the 1xEVDO system is changing the system monitoring timing and for a certain period thereafter. Especially when the cdma2000 1x system is in a region where signals from a plurality of base stations compete with each other such that the idle handoff frequently repeats, the monitoring timing change process on the 1xEVDO system side after the cdma2000 1x idle handoff described above Frequently occurs, the incoming rate of cdma2000 1x is extremely lowered.

  The present invention has been made in view of the above problems, and in a hybrid terminal that switches between the cdma2000 1x system, the 1xEVDO system, and the two systems to communicate with the base station, wireless communication that prevents deterioration of the incoming rate of cdma2000 1x The purpose is to provide a terminal.

The present invention provides a wireless communication terminal capable of performing wireless communication with a base station in each communication method using the first communication method and the second communication method, and in the wireless communication terminal capable of both types of standby, the first communication method. Setting means for setting a waiting time for waiting for an incoming call from the base station in the first communication method continuously after the communication with the base station is completed, and the base station in the first communication method Determining means for determining the cause of termination of communication with the communication means, and the setting means does not set the waiting time when the cause of termination of communication determined by the determining means is an end in accordance with a normal sequence. It is characterized by.

In a third aspect of the invention, the first communication method is a 1xEVDO system, and the second communication method is a cdma2000 1x system.

The present invention provides a wireless communication terminal control method capable of performing wireless communication with a base station in each communication method using the first communication method and the second communication method, and waiting in both types. In the communication method, the cause of termination of communication with the base station is determined, and when the cause of termination of communication is termination in accordance with a normal sequence, the waiting time is not set.

In a sixth aspect of the invention, the first communication method is a 1xEVDO system, and the second communication method is a cdma2000 1x system.

  According to the present invention, determination means for determining a cause of termination of communication with the base station, and a standby state for determining whether to set a standby time for continuously waiting for an incoming call from the base station based on the cause of termination Therefore, the waiting time can be set as appropriate depending on the cause of termination of communication with the base station, the throughput of data communication can be improved, and the decrease in the incoming rate can be improved.

  In particular, when the cause of termination is due to the correct processing procedure, the waiting time is not set so that the incoming rate can be improved. When the cause of termination is unexpected, the waiting time is set so that the throughput of data communication can be improved. .

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a wireless communication terminal according to an embodiment of the present invention.

  The radio communication terminal according to the present embodiment selectively switches between a cdma2000 1x communication system and a 1x EVDO (1x Evolution Data Only) communication system to switch between the base station 100A and the base station 100B in each system. This is a wireless communication terminal that can communicate while moving by handoff.

  The antenna 10 converts the high-frequency signal from the radio unit 20 into radio waves and transmits the radio wave to the base stations 100A and 100B. The antenna 10 receives radio waves from the base stations 100A and 100B and transmits the radio waves to the radio unit 20 as high-frequency signals.

  The radio unit 20 converts the high-frequency signal sent from the antenna 10 into a baseband signal, sends it to the radio processing units 40 and 50 via the switching unit 30, and sends the switching unit 30 from the radio processing units 40 and 50 to the radio processing unit 40. The baseband signal sent via the route is converted into a high frequency signal and sent to the antenna 10.

  The switching unit 30 selectively sends the baseband signal from the 1xEVDO radio processing unit 40 or the cdma2000 1x radio processing unit 50 to the radio unit 20, and selectively sends the baseband signal from the radio unit 20 to the 1xEVDO radio processing unit 40. Alternatively, it is sent to the cdma2000 1x wireless processing unit 50.

  The 1xEVDO wireless processing unit 40 converts the data signal transmitted in the 1xEVDO format into a baseband signal, and sends it to the wireless unit 20 via the switching unit 30. Further, the baseband signal transmitted from the wireless unit 20 via the switching unit 30 is converted into a data signal in 1xEVDO format.

  Similar to the 1xEVDO wireless processing unit 40, the cdma2000 1x wireless processing unit 50 converts the data or audio signal transmitted in the cdma2000 1x format into a baseband signal, and sends the baseband signal to the wireless unit 20 via the switching unit 30. Further, the baseband signal transmitted from the wireless unit 20 via the switching unit 30 is converted into data or audio signal in cdma2000 1x format.

  The hybrid unit 60 is a control unit that selectively switches between two communication systems of 1xEVDO and cdma2000 1x to control the two communication systems. The hybrid unit 60 is connected to the switching unit 30, the 1xEVDO wireless processing unit 40, and the cdma2000 1x wireless processing unit 50, respectively. Connected and controls each switching. In particular, during standby, the two communication systems are selectively switched at predetermined time intervals to wait for a call in both communication systems. The hybrid unit 60 is connected to a memory 70, a display unit 80, and an external I / O 90.

  The memory 70 is a storage unit that can write or read a control program for the wireless communication terminal, communication data, or the like in response to a request.

  The display unit 80 is mainly configured by an LCD display or the like, and is a display unit that displays the state of the wireless communication terminal, communication data, and the like.

  The external I / O 90 is an interface through which a wireless communication terminal can be connected to an external device such as another personal computer or a PDA, and various data can be transmitted and received.

  Next, the operation of the wireless communication terminal according to the embodiment of the present invention configured as described above will be described.

  The cdma2000 1x system and 1xEVDO system are required to monitor the system at regular intervals in order to measure radio wave conditions and monitor incoming calls. This interval is, for example, every 5.12 seconds.

  Since the wireless communication terminal cannot communicate with two systems at the same time, the antenna 10 and the wireless unit 20 are switched so that each system can be monitored at intervals of 5.12 seconds.

  FIG. 2 shows a time chart of this monitoring timing. First, when it becomes the monitoring timing of the cdma2000 1x system, the antenna 10 and the radio unit 20 are switched to cdma2000 1x, the system is shifted to the system monitoring state (Active), and the radio wave state of the base station and the incoming call are monitored. When the monitoring process of the cdma2000 1x system ends, the antenna 10 and the radio unit 20 are released, and the cdma2000 1x system shifts to a sleep state (Sleep).

  Then, at the monitoring timing of the 1xEVDO system, switching the antenna 10 and the radio unit 20 to 1xEVDO shifts to the active state, and monitors the radio wave state and incoming call of the base station. When the monitoring process of the 1xEVDO system ends, the antenna 10 and the radio unit 20 are released, and the 1xEVDO system shifts to the sleep state.

  Next, the 1xEVDO system has a mechanism that allows communication to be resumed immediately when communication disconnection occurs due to radio wave conditions or the like. When a wireless communication terminal detects a communication disconnection due to a radio wave condition, it transmits a communication disconnection message (Connection Close Message) to the base station, and then receives an incoming message (Page Message) instructing reconnection from the base station for a certain period of time. Is waiting in a continuous reception state so that can be received. The continuous standby time after the disconnection of communication is called a guard time (suspended time). After a certain time elapses, the wireless communication terminal shifts to a sleep state in order to save power, and thereafter monitors the system at regular intervals.

  If the wireless communication terminal can receive an incoming message from the base station during the continuous reception state, the wireless communication terminal can immediately resume communication. Once the wireless communication terminal shifts to the sleep state, the system only at a certain interval. Since monitoring is performed, reconnection takes time.

  FIG. 3 shows a time chart of communication using the guard time in the 1xEVDO system.

  In a state where 1xEVDO is performing data communication (Comm), when communication with the base station is disconnected due to sudden disconnection of radio waves or the like, a communication disconnect message is transmitted to the base station. After that, the state shifts to a continuous reception state (Idle) for receiving a signal from the base station, and when the guard time elapses, the state shifts to the Sleep state (FIG. 3A).

  FIG. 3B is a time chart when an incoming message is received from the base station after the communication disconnection is detected and the communication disconnection message is transmitted until the guard time elapses. When the radio wave state recovers before the guard time elapses, the 1xEVDO is continuously receiving in the idle state, so that the incoming message from the base station can be immediately received, and the data communication can be resumed.

  FIG. 3C is a time chart when the guard time is not set (that is, SuspendTime = 0). If the communication disconnection is detected, the communication disconnection message is transmitted, and the sleep state is immediately entered, the incoming message can be received even if the incoming message (Page (1)) from the base station is immediately transmitted. First, the incoming message (Page (2)) from the base station is received when the incoming call monitoring process is performed after 5.12 seconds. That is, when the guard time is not set, the throughput of data communication is reduced unless the radio wave condition is good.

  However, this reconnection mechanism using the guard time is effective in the wireless communication system of the 1xEVDO system alone, but the following problems occur in the hybrid terminal of cdma2000 1x and 1xEVDO. That is, in the cdma2000 1x system, when the idle handoff (handoff in the standby state) due to the radio wave state occurs and the base station is switched and the monitoring timing is different, the monitoring timing is updated in the cdma2000 1x system.

  At this time, in order to prevent the monitoring timings of the cdma200 1x system and the 1xEVDO system from overlapping, the wireless communication terminal performs readjustment (Reconfiguration) of the system monitoring timing also in the 1xEVDO system. In order to perform this readjustment, the wireless communication terminal immediately switches to the 1xEVDO system when the idle handoff of the cdma2000 1x system ends. In the 1xEVDO system, communication with the base station is started in order to perform readjustment. Thereafter, the readjustment is completed and the communication with the base station is disconnected, but the 1xEVDO system cannot be released during the guard time even after the communication is disconnected due to the guard time described above. Therefore, even if there is an incoming call to the cdma2000 1x system during that period, the incoming call cannot be detected because the antenna and the radio unit are switched to the 1xEVDO side. In particular, when the cdma2000 1x system is in an area where the idle handoff is repeated such that the monitoring timing is changed near the boundary of the base station, in order to change the monitoring timing on the 1xEVDO system side after the idle handoff of cdma2000 1x, Since the time that the 1xEVDO system occupies the antenna 10 and the radio unit 20 becomes long, the incoming rate of the cdma2000 1x system is extremely lowered.

  FIG. 4 shows a conventional time chart when an idle handoff occurs in the cdma2000 1x system.

  The cdma2000 1x system detects idle handoff based on the radio wave condition of the base station and executes idle handoff processing. At this time, if the incoming monitoring timing of the cdma2000 1x system is changed, immediately after the idle handoff process of cdma2000 1x is completed, the 1xEVDO system is immediately set in the active state and readjustment with the base station is performed. At this time, when this readjustment process is completed, the 1xEVDO system transmits a communication disconnection message to the base station. However, since the guard time is set in the 1xEVDO system as described above, until the guard time ends. Since the standby state is maintained while the 1xEVDO system remains in the Active state, even if the incoming message (Page (1)) is transmitted from the base station to the cdma2000 1x system, the incoming call on the cdma2000 1x system side can be detected. The incoming message (Page (2)) is detected for the first time at the incoming monitoring timing after the 1xEVDO shifts to the sleep state.

  In the wireless communication terminal according to the embodiment of the present invention, in order to improve the above problem, the guard time of the 1xEVDO system is guarded in the same way as in the past when the 1xEVDO system ends unexpected communication such as instantaneous interruption of radio waves during data communication. The time is set, and the guard time is not set when the communication process with the base station ends normally.

  FIG. 5 is a sequence showing a flow of processing at the time of 1xEVDO system communication in the wireless communication terminal according to the embodiment of the present invention.

First, when 1xEVDO communication disconnection occurs (step 101), it is determined whether or not the cause of disconnection is a normal process (step 102). If the normal processing such as the end made in accordance with the processing sequence of the wireless communication terminal is completed, SuspendTime = 0 is set so that the sleep state can be shifted immediately after the disconnection processing is completed. No time is provided (step 104). On the other hand, if it is not a normal end such as an unexpected communication disconnection due to an instantaneous interruption of radio waves, etc., the guard time is set by setting SuspendTime = Tsuspend so that the state transitions to the Sleep state after the disconnection process ends (step 103)
Next, a communication disconnect message is transmitted to the base station to notify the base station that communication disconnection has occurred (step 105).

  Next, in steps 106 and 107, a guard time counting process (countdown) is performed. When the countdown is completed, the process shifts to the sleep state (step 108), and the process is terminated.

  With the above processing, the guard time setting can be changed depending on the type of communication disconnection in the 1xEVDO system.

  FIG. 6 is a time chart when an idle handoff occurs in the cdma2000 1x system when the guard time is not set (SuspendTime = 0).

  When the cdma2000 1x system performs idle handoff processing and the incoming call monitoring timing is changed, the 1xEVDO system is shifted to the Active state and readjustment processing is performed on the base station in order to change the incoming monitoring timing of 1xEVDO. When the readjustment process ends normally and the line is disconnected, it is determined in step 102 in FIG. 5 that the communication has been completed in accordance with the normal sequence, so the guard time is set to 0. As soon as is finished, the 1xEVDO system can transition to the Sleep state. Therefore, after the readjustment process is completed, if an incoming message is detected at the incoming monitoring timing of the cdma2000 1x system, communication can be performed immediately.

  In the wireless communication terminal according to the embodiment of the present invention configured as described above, the 1xEVDO base station is required to change the monitoring timing of 1xEVDO due to idle handoff of the cdma2000 1x system, and the monitoring timing is readjusted. 1xEVDO system guard time is not set when the communication processing with the server ends normally, so the time for 1xEVDO to occupy the system is shortened, so when idle handoff frequently occurs in the cdma2000 1x system Can also improve the decrease in the incoming rate of cdma2000 1x.

  In this embodiment, the guard time setting condition is determined based on whether the 1xEVDO communication disconnection is a radio wave disconnection or the other (communication disconnection by a normal sequence). The end of readjustment, an end instruction from the user, and the like.

It is a block diagram of the radio | wireless communication terminal of embodiment of this invention. It is a time chart showing the conventional incoming call monitoring timing. It is a time chart showing the process of the conventional guard time in a 1xEVDO system. 10 is a conventional time chart when an idle handoff occurs in the cdma2000 1x system. It is a flowchart showing the flow of the process of the radio | wireless communication terminal of embodiment of this invention. It is a time chart of an embodiment of the invention when idle handoff occurs in a cdma2000 1x system.

Explanation of symbols

10 Antenna 20 Radio unit (RF)
30 switching unit 40 1xEVDO wireless processing unit 50 cdma2000 1x wireless processing unit 60 hybrid unit 70 memory 80 display unit 90 external I / O
100A, 100B base station

Claims (4)

In a wireless communication terminal that uses the first communication method and the second communication method to perform wireless communication with the base station in each communication method and can stand by both methods,
Setting means for setting a standby time for waiting for an incoming call from the base station in the first communication method continuously after the first communication method ends communication with the base station;
Determining means for determining a cause of termination of communication with the base station in the first communication method;
The wireless communication terminal characterized in that the setting means does not set the standby time when the cause of termination of communication determined by the determination means is an end in accordance with a normal sequence.   The wireless communication terminal according to claim 1, wherein the first communication method is a 1xEVDO system, and the second communication method is a cdma2000 1x system. In a wireless communication terminal control method capable of performing wireless communication with a base station in each communication method using the first communication method and the second communication method and waiting in both methods,
Radio communication characterized in that the cause of termination of communication with the base station is determined in the first communication method, and the waiting time is not set when the cause of termination of communication is termination in accordance with a normal sequence Terminal control method.   The wireless communication terminal control method according to claim 3, wherein the first communication method is a 1xEVDO system, and the second communication method is a cdma2000 1x system.

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