JP2007202073A - Radio communication apparatus and radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress increase in power consumption and to attain improvement in communicability in a radio communication apparatus which sequentially performs capture operations on a plurality of communication system networks. <P>SOLUTION: The present invention relates to a radio communication apparatus which comprises a communication means for performing radio communication through a communication connection with any one of a plurality of communication system networks and a capture control means for controlling the communication means to sequentially perform captures, in accordance with priorities, on the plurality of communication system networks at intervals of a predetermined time and in which the communication means performs the communication connection with a communication system network which successes the capture. The radio communication apparatus includes a communication failure detection means for detecting a communication failure on each of the communication system networks, and a predetermined time setting means for setting the predetermined time for each communication system network based on a degree of the communication failure, and the capture control means controls the communication means to perform a capture on each communication system network in response to the lapse of the predetermined time set by the predetermined time setting means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

 The present invention relates to a wireless communication apparatus and a wireless communication method.

  Conventionally, in a wireless communication between a wireless communication device (for example, a mobile phone) and a base station, when there are a plurality of communication system networks in which priorities are set in advance, the wireless communication device is a communication system network having a high priority. The communication operation is performed in order from the communication system network that can be captured, and the standby state is established. On the other hand, when the communication system network with a low priority is in the standby state, a predetermined time ( When the reselection time (hereinafter referred to as “reselection time”) elapses, the capturing operation is started again from the communication system network having a high priority. Here, the acquisition operation means acquisition of a channel used in each communication system network. In addition, the wireless communication device repeats the capturing operation for the same communication system network when the channel is lost after the communication connection with a certain communication system network is completed and shifts to the standby state. If it fails, the operation proceeds to the acquisition operation of the communication system network having the next lowest priority.

Furthermore, the wireless communication apparatus as described above shifts to the sleep state if all the communication system networks are not successfully captured within a predetermined time, and after returning from the sleep state after a predetermined time (sleep return time), Start the capture operation. For example, Japanese Patent Laid-Open No. 2001-251234 discloses a technique for reducing the power consumption by the capturing operation by changing such a sleep recovery time according to the remaining battery level.
JP 2001-251234 A

 By the way, when performing the capture operation of the communication system network as described above, the following problems occur. For example, in the case of a CDMA2000 1x (Code division Multiple Access 2000 1x) scheme, a first communication system network using the highest priority 2 GHz band and a second communication system network using the next highest priority 800 MHz band There is a third communication system network that uses the old 800 MHz band with the lowest priority. Note that the second communication system network using the new 800 MHz band is a world standard 800 MHz band system, and the third communication system network using the old 800 MHz band is a Japanese specification 800 MHz band system. The third communication system network is widespread throughout Japan, but the first and second communication system networks are currently available only in a part of the city center and the like.

  As described above, when wireless communication is performed in an area where the first or second communication system network with high priority cannot be used, the wireless communication apparatus performs reselection even though acquisition of these communication system networks always fails. Whenever time elapses, the capturing operation is started in order from the first communication system network having the highest priority. As a result, a wasteful capturing operation is performed, and there is a problem that power consumption increases and battery life is shortened.

In addition, there is a communication system network with a high priority, but when performing wireless communication in an extremely unstable place where the radio field strength is weak, the wireless communication device may fail to capture or transition to a standby state. Despite the high possibility of channel loss, every time the reselection time elapses, the acquisition operation is started in order from the first communication system network having the highest priority. As a result, a useless acquisition operation (when the channel is lost, the acquisition operation must be repeated a predetermined number of times for the same communication system network), and the power consumption increases as described above, resulting in battery life. There is a problem that becomes shorter.
Further, in any case, during the capturing operation, the standby state is temporarily exited, so there is a possibility that the incoming call notification may not be received, and there is a problem that the communication property is lowered.

  Therefore, a method of reducing the power consumption by the capture operation by changing the reselection time according to the remaining amount of the battery using the technique of the above Japanese Patent Laid-Open No. 2001-251234 can be considered. When wireless communication is performed in areas where there is no high communication system network or where radio field strength is unstable, wasteful capture operations are eventually performed, and an increase in power consumption cannot be effectively suppressed. .

  The present invention has been made in view of the above-described circumstances, and suppresses an increase in power consumption in a wireless communication apparatus that sequentially performs a capturing operation in accordance with priority with respect to a plurality of communication system networks. The purpose is to improve.

 In order to achieve the above object, according to the present invention, as a first solving means related to a wireless communication apparatus, communication that establishes communication connection with any one of a plurality of communication system networks and performs wireless communication with a base station. And an acquisition control means for controlling the communication means so as to sequentially acquire the plurality of communication system networks in accordance with a priority set in advance for each of a plurality of communication systems. The means is a wireless communication device that performs communication connection with the communication system network that has succeeded in capturing, communication failure detection means for detecting a communication failure for each communication system network, and each of the detection detected by the communication failure detection means The degree of communication failure for each communication system network is obtained, and the predetermined amount is determined for each communication system network based on the degree of communication failure. Predetermined time setting means for setting a time interval, and the acquisition control means performs the acquisition for each communication system network as the predetermined time set by the predetermined time setting means elapses. The means of controlling the means is adopted.

  Further, in the present invention, as a second solving means relating to the wireless communication device, in the first solving means, the communication failure detecting means detects a capture failure for each communication system network as the communication failure. Features.

  Further, in the present invention, as the third solving means relating to the wireless communication apparatus, in the second solving means, the predetermined time setting means counts the number of times of acquisition failure for each communication system network, and the count value When the value exceeds a predetermined threshold, the predetermined time for the communication system network corresponding to the count value is increased.

According to the present invention, as a fourth solving means relating to the wireless communication apparatus, in any one of the first to third solving means, the predetermined time setting means is configured such that the communication connection by the communication means is completed, When a transition is made to a state, the degree of communication failure with respect to the communication system network that has transitioned to the standby state is initialized.

  Further, in the present invention, as a fifth solving means relating to the wireless communication apparatus, in the first or second solving means, the communication failure detecting means is switched to a standby state after the communication connection by the communication means is completed. Then, a communication failure with respect to the communication system network that has transitioned to the standby state is detected.

  Further, in the present invention, as a sixth solving means relating to the wireless communication device, in the fifth solving means, the predetermined time setting means is configured to wait for a predetermined waiting time after the communication failure detecting means has transitioned to a standby state. When the communication failure is detected within the reception time, the degree of communication failure with respect to the communication system network that has transitioned to the standby state is increased.

  According to the present invention, as a seventh solving means relating to the wireless communication apparatus, in the fifth or sixth solving means, the predetermined time setting means has a continuous standby time after transitioning to the standby state. When the predetermined standby time is exceeded, the degree of communication failure with respect to the communication system network that has transitioned to the standby state is initialized.

  In the present invention, as the eighth solving means relating to the wireless communication apparatus, in any one of the first to seventh solving means, the communication failure detecting means detects a failure in capturing each communication system network in the first communication. In addition to detecting as a failure, a communication failure occurring within a predetermined standby time after transitioning to a standby state for each communication system network is detected as a second communication failure, and the predetermined time setting means includes the first time setting means The predetermined time for the communication system network corresponding to the total value is increased when a total value of the degree of communication failure and the second communication failure level is equal to or greater than a predetermined value. .

  Further, in the present invention, as a ninth solving means relating to a wireless communication apparatus, in any of the first to eighth solving means, the capture control means has completed communication connection by the communication means, and is in a standby state. The communication means is controlled so as to continuously perform a capturing operation for a predetermined number of times with respect to the communication system network in which communication failure has occurred, and the predetermined time setting means is the communication system in which the communication failure has occurred. The predetermined number of times is decreased based on the degree of communication failure with respect to the network.

 Also, in the present invention, as a tenth solution means according to the wireless communication apparatus, in any one of the first to ninth solution means, the predetermined time setting means is configured such that the remaining amount of the battery is equal to or less than a predetermined remaining amount. The predetermined time is set based on the degree of communication failure in at least one of the case where the battery is in a non-charged state.

 On the other hand, in the present invention, as a first solving means related to a wireless communication method, a wireless communication with a base station is performed by establishing communication connection with any one of a plurality of communication system networks, and at every elapse of a predetermined time. A wireless communication method for performing communication connection with a communication system network that has succeeded in acquisition while sequentially acquiring the plurality of communication system networks according to preset priorities, and for each communication system network A first step of detecting a communication failure, a second step of obtaining a degree of communication failure for each of the communication system networks detected by the first step, and each communication system based on the degree of communication failure A third step of setting the predetermined time for each network, and the predetermined time set in the third step. Depending on the over, having a fourth step of capturing for each communication system network, employing the means of.

 According to the present invention, it is possible to suppress an increase in power consumption and improve communication performance in a wireless communication apparatus that sequentially performs a capturing operation according to priority for a plurality of communication system networks.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration block diagram of a wireless communication apparatus according to an embodiment of the present invention. As an example of the wireless communication apparatus, a CDMA2000 1x mobile phone will be described. That is, the wireless communication device includes a first communication system network that uses the highest priority 2 GHz band, a second communication system network that uses the next highest priority 800 MHz band, and the oldest 800 MHz that has the lowest priority. It is possible to communicate with a third communication system network using a band.

 As shown in FIG. 1, the wireless communication apparatus includes a wireless communication unit 1 (communication means), a key input unit 2, a display unit 3, a voice input / output unit 4, a camera unit 5, a control unit 6, and a first reselection. It comprises a timer 7, a second reselection timer 8, a third reselection timer 9, a stable standby timer 10 and a storage unit 11. The control unit 6 includes a communication state detection unit 6a (communication failure detection unit), a timer control unit 6b (predetermined time setting unit), and a capture control unit 6c (capture control unit).

 The wireless communication unit 1 performs communication connection with any one of the first communication system network, the second communication system network, and the third communication system network under the control of the control unit 6, and a base (not shown) Wireless communication with the station. In addition, this radio | wireless communication part 1 performed the acquisition operation | movement of each communication system network according to progress of the reselection time (predetermined time) of each communication system network under control by the acquisition control part 6c, and succeeded in acquisition. A communication connection is established with the communication system network. Here, the capturing operation is capturing the frequency channel and the sync channel of each communication system network, and the communication connection is capturing the paging channel and negotiating various parameters with the base station.

 The key input unit 2 includes dial keys, function keys, power keys, and the like, and outputs operation information of these keys to the control unit 6 as operation signals. The display unit 3 is, for example, a liquid crystal display or an organic EL display, and displays various messages, images, and the like based on display signals input from the control unit 6. The voice input / output unit 4 includes a microphone and a speaker. The voice input / output unit 4 converts voice input from the outside into a voice signal and outputs the voice signal to the control unit 6. And output sound to the outside. The camera unit 5 is a CCD (Charge Coupled Device) camera, for example, and outputs an image signal of a photographed image to the control unit 6 under the control of the control unit 6.

 The control unit 6 controls the overall operation of the wireless communication apparatus based on a predetermined control program stored in advance in the storage unit 11, an operation signal input from the key input unit 2, a communication state of the wireless communication unit 1, and the like. To do. In the control unit 6, the communication state detection unit 6 a detects success or failure of acquisition for each communication system network based on the communication state of the wireless communication unit 1. In addition, the communication state detection unit 6a detects a lost paging channel (channel lost) after the communication connection with any communication system network is completed and the standby state transition.

 The timer control unit 6b sets a reselection time for each communication system network based on the success or failure of acquisition by the communication state detection unit 6a and the detection result of channel lost. Specifically, a first reselection time RT1 corresponding to the first communication system network, a second reselection time RT2 corresponding to the second communication system network, and a third corresponding to the third communication system network. Reselection time RT3 is set. That is, the timer control unit 6b performs control so that the first reselection timer 7 is started at the first reselection time RT1 set as described above, and the second reselection time RT2 The reselection timer 8 is controlled to be activated, and the third reselection timer 9 is activated at the third reselection time RT3. Moreover, the timer control part 6b starts the stable standby timer 10 after a standby state transition.

 Further, the timer control unit 6b detects that each reselection timer has counted up, and outputs a count-up detection signal to the capture control unit 6c. Based on the count-up detection signal, the capture control unit 6c controls the wireless communication unit 1 to start a capture operation for the communication system network corresponding to the counted up reselection timer.

 The first reselection timer 7 is activated under the control of the timer control unit 6b and counts the first reselection time RT1. The second reselection timer 8 is activated under the control of the timer control unit 6b and counts the second reselection time RT2. The third reselection timer 9 is activated under the control of the timer control unit 6b and counts the third reselection time RT3. In this embodiment, the reselection timers are separately provided. However, on the actual circuit, it is desirable that these reselection timers be operated at an integer multiple of the same clock signal. With such a configuration, the number of parts can be reduced, and by providing separate independent reselection timers, frequent capture operations described below can be prevented.

The stable standby timer 10 is activated under the control of the timer control unit 6b and counts the stable standby time (predetermined standby time) ST. The stable standby time ST is set to a time at which it is determined that the standby state has been stably changed after the standby state transition.
The storage unit 11 includes control programs and various data used by the control unit 6, initial setting values of the first reselection time RT1, the second reselection time RT2, and the third reselection time RT3, and stable standby. The time ST and the like are stored.

 Next, the operation of the wireless communication apparatus configured as described above will be described in detail with reference to the flowcharts of FIGS.

 Here, in the initial state when the power is turned on, the wireless communication unit 1 performs the capturing operation from the first communication system network having the highest priority under the control of the capturing control unit 6c. FIG. 2A is a flowchart showing an acquisition operation for the first communication system network. First, the timer control unit 6b determines whether or not the first reselection timer 7 is being activated (step S1). In this step S1, when “NO”, that is, when the first reselection timer 7 is not activated (this is the case when the power is turned on), the capture control unit 6c performs the first communication based on the determination result. The wireless communication unit 1 is controlled to start the capturing operation for the system network (step S2). The wireless communication unit 1 scans the frequency channel and the sync channel of the first communication system network.

 Based on the communication state of the wireless communication unit 1, the communication state detection unit 6a detects whether the acquisition of the frequency channel and the sync channel has succeeded. The control unit 6 determines whether or not the acquisition of the first communication system network has succeeded based on the detection result by the communication state detection unit 6a (step S3), and “YES”, that is, the first communication system network. If the acquisition is successful, the wireless communication unit 1 is controlled to start communication connection with the first communication system network (step S4). And the control part 6 starts the stable standby timer 10 by the timer control part 6b (step S5), and transfers to the standby process routine shown in FIG.2 (b) (step S6).

 On the other hand, if “YES” in step S1, that is, if the first reselection timer 7 is activated, the control unit 6 determines whether or not the first reselection timer 7 has been counted up by the timer control unit 6b ( It is determined whether or not the first reselection time RT1 has elapsed (step S7). If “YES”, that is, the count is up, the process proceeds to step S2, and “NO”, that is, counts up. If not, the process proceeds to the acquisition operation for the second communication system network shown in FIG. 3A (step S13).

Furthermore, in step S3, when “NO”, that is, when acquisition of the first communication system network fails, the timer control unit 6b uses the first number used to count the number of acquisition failures for the first communication system network. The count variable C1 is incremented (step S8). In the initial state, the first count variable C1 = 0.
And the 1st count variable C1 counted according to the frequency | count of acquisition failure will be calculated | required as a degree of communication failure.

Then, the control unit 6 compares the first count variable C1 with the first threshold value Ct1, and determines whether or not the first count variable C1 is smaller than the first threshold value Ct1 (step S9). If “YES”, that is, if the first count variable C1 is smaller than the first threshold value Ct1, the operation proceeds to the acquisition operation for the second communication system network shown in FIG. 3A (step S13). On the other hand, if “NO” in step S9, that is, if the first count variable C1 becomes equal to or greater than the first threshold value Ct1, the timer control unit 6b increments the first reselection time RT1 (step S10). ).
That is, when the number of acquisition failures (first count variable C1) reaches the number defined by the first threshold value Ct1, the first reselection time RT1 is increased. The first threshold value Ct1 is set to about 10 times in the initial state.

 Subsequently, when the number of acquisition failures reaches the number defined by the first threshold value Ct1 as described above, the timer control unit 6b decrements the first threshold value Ct1 (step S11), and the channel lost described later. The first scan count threshold value Crt1 at the time is decremented (step S12), and the process proceeds to a capturing operation for the second communication system network (step S13).

Next, the standby processing routine will be described with reference to the flowchart of FIG. The standby process routine is a process after the communication connection is completed and the standby state transitions.
First, the communication state detection unit 6a detects whether or not the paging channel has been lost (channel lost) based on the communication state of the wireless communication unit 1. The control unit 6 determines whether or not a channel lost has occurred based on the detection result by the communication state detecting unit 6a (step S20). If “NO”, that is, if no channel lost has occurred, stable control is performed. It is determined whether or not the timer 10 has counted up (step S21).

 In step S21, when “NO”, that is, when the stable standby timer 10 has not been counted up (when the continuous standby time after transitioning to the standby state has not reached the stable standby time ST), the control is performed. The unit 6 proceeds to the process of step S20, while “YES”, that is, when the stable standby timer 10 is counting up (when the stable standby time ST has elapsed since the transition to the standby state), The first count variable C1 = 0 is initialized (step S22), and the first reselection time RT1 is initialized to an initial set value (step S23). The timer control unit 6b then counts each reselection time set by the process so far, so that the first reselection timer 7, the second reselection timer 8, and the third reselection timer 9 Is activated (step S24), and the standby state is continued (step S25). Thereafter, the timer control unit 6b proceeds to the process of step S1 in FIG. 2A (step S26).

 On the other hand, if “YES” in step S20, that is, if a channel lost has occurred, the control unit 6 sets the first scan count variable Cr1 for counting the number of scans of the paging channel to 0 (step S27). Then, the control unit 6 determines whether or not the first scan count variable Cr1 is smaller than the first scan count threshold Crt1 (step S28).

 In this step S28, if “YES”, that is, if the first scan count variable Cr1 is smaller than the first scan count threshold Crt1, the control unit 6 increments the first scan count variable Cr1 (step S29). The acquisition controller 6c is requested to rescan the paging channel (step S30). The acquisition control unit 6c controls the wireless communication unit 1 so as to rescan the paging channel.

Based on the communication state of the wireless communication unit 1, the communication state detection unit 6a detects whether or not the paging channel has been recaptured. The control unit 6 determines whether or not the paging channel has been recaptured based on the detection result by the communication state detection unit 6a (step S31). If “NO”, that is, the paging channel cannot be recaptured, The process proceeds to S28.
That is, when the channel is lost by the processing of steps S28 to S31, the paging channel is rescanned for the same communication system network by the number of times defined by the first scan count threshold Crt1. Note that such a first scan count threshold Crt1 is set to about 5 as an initial set value.

 Then, in step S31, the timer control unit 6b proceeds to the process of step S21 when “YES”, that is, when the paging channel can be recaptured.

On the other hand, in step S28, when “NO”, that is, when the first scan count variable Cr1 becomes equal to or larger than the first scan count threshold Crt1, the timer control unit 6b counts up the stable standby timer 10. Whether or not (step S32). If “NO” in step S32, that is, if the stable standby timer 10 has not counted up, the control unit 6 proceeds to the process of step S8 in FIG. When the standby timer 10 is counting up, the operation shifts to a capturing operation for the second communication system network (step S33).
Thus, when the continuous standby time when the channel is lost is less than the stable standby time ST, the first count variable C1 as the degree of communication failure is increased as in the case of acquisition failure.

  FIG. 3A is a flowchart showing an acquisition operation for the second communication system network, and FIG. 3B is a standby processing routine in the acquisition operation for the second communication system network. As can be seen from these figures, the capturing operation for the second communication system network is the same as the capturing operation for the first communication system network shown in FIG. In FIG. 3, the second count variable C2, the second threshold value Ct2, the second reselection time RT2, and the second scan count variable are shown as the unique variables and constants in the capture operation for the second communication system network. Cr2 and the second scan count threshold Crt2 are used, and the processing of step S53 and step S73 is changed to “transition to acquisition operation for the third communication system network”.

  FIG. 4A is a flowchart showing an acquisition operation for the third communication system network, and FIG. 4B is a standby processing routine in the acquisition operation for the third communication system network. The capturing operation for the third communication system network is also the same as that shown in FIGS. 2 and 3, and a detailed description thereof will be omitted. In FIG. 4, the third count variable C3, the third threshold value Ct3, the third reselection time RT3, and the third scan count variable are shown as unique variables and constants in the capture operation for the third communication system network. Cr3 and the third scan count threshold Crt3 are used, and the processing in step S93 and step S113 is changed to “transition to capture operation for the first communication system network”. In any of steps S3, S43, and S83, if acquisition of each communication system network fails and the process proceeds to step S93, the out-of-service state is entered, and the reselection timers 7 to 9 operate in the out-of-service state. Accordingly, the capturing operation for each communication system network is performed.

  Hereinafter, it demonstrates more concretely using the flowchart of these FIGS. Here, the initial setting value of each reselection time is set to satisfy RT1 = RT2 = RT3. Note that RT1 <RT2 <RT3 may be set.

  First, since each reselection timer is not started when the power is turned on, the processes of steps S2 and S3 in FIG. 2A are performed. Here, it is assumed that acquisition of the first communication system network has failed in step S3. In this case, the first count variable C1 is incremented by the process of step S8, and C1 = 1. At this time, in the process of step S9, the first count variable C1 is smaller than the first threshold value Ct1 (10 times). Therefore, the process of step S13, that is, the acquisition for the second communication system network in FIG. Move to operation.

  In FIG. 3A, since the second reselection timer 8 is not activated, the processes of steps S42 and S43 are performed. Here, assuming that acquisition of the second communication system network has succeeded in step S43, the processing of steps S44 to S46 is performed, and the process proceeds to the standby processing routine of FIG.

  Here, after the communication connection is started, if the stable standby timer 10 counts up without occurrence of channel lost, that is, if “YES” in the step S61, the second count variable C2 = The third reselection time RT3 is initialized to the initial set value by the process of step S63. At this time, since the second count variable C2 and the third reselection time RT3 are not originally changed, the respective values do not change.

  Then, after the all-reselection timer is activated by the process of step S64, the second communication system network enters a standby state. Thus, even in the standby state, the process of step S1 in FIG. 2A is performed by the process of step S66. At this time, since the first reselection timer 7 is activated, the process of step S7 is performed. At this point in time, the first reselection timer 7 has not been counted up, and the process proceeds to step S41 in FIG. Here, since the second reselection timer 8 is being activated, the process of step S47 is performed. At this time, naturally, the second reselection timer 7 has not counted up, so the routine proceeds to step S81 in FIG. Here, since the third reselection timer 9 is being activated, the process of step S87 is performed. At this point, of course, the third reselection timer 9 is not counting up, so the routine proceeds to step S1 in FIG.

  That is, each reselection timer is monitored until one of the reselection timers counts up. At this time, since each reselection time remains at the initial set value, first, the first reselection timer 7 counts up. That is, the processes of steps S2 and S3 in FIG. 2A are performed, and the re-acquisition operation of the first communication system network is performed. Here, also in this re-acquisition operation, when acquisition of the first communication system network fails, the first count variable C1 is incremented by the process of step S8, and C1 = 2. Also in this case, in the process of step S9, the first count variable C1 is smaller than the first threshold value Ct1 (10 times), so that the process of step S13, that is, the second communication system network of FIG. Transition to capture operation.

  Thereafter, similarly to the above, it is assumed that the second communication system network can be set in a standby state, and acquisition of the first communication system network has failed 10 times (first count variable C1 = 10). ). That is, since the first count variable C1 has the same value as the first threshold value Ct1, the first reselection time RT1 is increased by the processing in steps S10 to S12 in FIG. The threshold value Ct1 and the first scan count threshold value Crt1 decrease.

  And when it will be in a stand-by state with respect to a 2nd communication system network and all the reselection timers are started, only 1st reselection timer 7 will be changed in 1st reselection time RT1. It will count up. That is, when the number of acquisition failures (first count variable C1) reaches the number defined by the first threshold value Ct1, the wireless communication apparatus has no first communication system network or exists. By determining that wireless communication is being performed in an extremely unstable place where the radio field intensity is weak and increasing the time (first reselection time RT1) until the next capture operation start for the first communication system network, It is possible to suppress useless capturing operation for the first communication system network, and to suppress power consumption and improve communication performance.

  Furthermore, as the number of acquisition failures increases (that is, there is a high possibility that wireless communication is performed in an extremely unstable place where the first communication system network does not exist or exists but has weak radio field strength). Since the selection time RT1 increases, it is possible to more effectively reduce power consumption and improve communication.

  Further, by reducing the first threshold value Ct1 according to the number of acquisition failures, the first reselection time RT1 can be increased at an early point in the process of step S9, and further according to the communication environment. It is possible to effectively reduce power consumption and improve communication performance.

  Then, as described above, the first reselection timer 7 counts up at the increased first reselection time RT1, and the processing after step S2 in FIG. Assume that the system network has been successfully captured.

  In this case, the processes of steps S4 to S6 are performed, and the process proceeds to the standby process routine of FIG. Here, after the communication connection is started, when the channel is not lost and the stable standby timer 10 counts up, that is, when “YES” in step S21, the first increased by the processing in step S22. The count variable C1 is initialized to 0, and the increased first reselection time RT1 is initialized to an initial set value by the process of step S23. Further, the decreased first scan number threshold Crt1 is also initialized to an initial set value.

  That is, if the channel has not been lost even after the acquisition has succeeded and the stable standby time ST has passed the predetermined standby time, the first communication system network exists and the radio wave strength is high. Since it can be determined that the vehicle has moved to a stable location, if the re-acquisition operation is performed at the large first reselection time RT1, the communication efficiency deteriorates. Therefore, when the state is stably shifted to the standby state, the first count variable C1 and the first reselection time RT1 are initialized.

  If it is determined in step S20 in FIG. 2B that a channel lost has occurred, the processing of steps S28 to S31 results in the number of paging channel as many times as specified by the first scan count threshold Crt1. Rescan is performed, but as described above, if the first communication system network does not exist or there is a strong possibility that wireless communication is performed in an extremely unstable place where the radio field strength is weak, a large number of times Performing rescan increases power consumption and deteriorates communication performance. Therefore, the number of rescans of the paging channel can be reduced by reducing the first scan number threshold Crt1 in accordance with the number of acquisition failures by the process of step S12, thereby reducing power consumption and improving communication performance. Can contribute.

  Further, if the process of step S32 does not succeed in re-acquiring the paging channel even if the first scan count threshold Crt1 is exceeded, and the stable standby time ST is within the predetermined standby time, FIG. By shifting to the process of step S8 of 2 (a) and increasing the number of acquisition failures, the first reselection time RT1 can be increased at an early point in time and consumed effectively according to the communication environment. Electric power can be suppressed and communication performance can be improved.

  The above description is an example, and in addition, the first communication system network and the second communication system network cannot be acquired, and the third communication system network can be acquired. The effect of can be obtained. Further, as can be seen from the above description, in an area where the first communication system network does not exist, the first reselection time RT1 exceeds the second reselection time RT2, and the first communication system network Instead, the acquisition operation may be started from the second communication system network. That is, in the past, the capture order was fixed according to the priority, but according to the present embodiment, the capture order can be changed according to the communication environment, reducing wasteful capture operations and effectively It is possible to reduce power consumption and improve communication.

 Note that the present invention is not limited to the above embodiment, and includes, for example, a function that allows the capturing operation described in the above embodiment to be performed by a user's selection by operating the user interface (key input unit 2). May be. Similarly, when the remaining battery level is equal to or lower than a predetermined threshold value by operating the key input unit 2, a function that allows the user to select the capturing operation as a power saving mode may be provided. Further, it is determined whether or not the battery is being charged. If the battery is being charged, there is no need to consider the power consumption. Therefore, a function for performing a normal capturing operation (capturing operation similar to the conventional one) may be provided. By providing such a function, it is possible to select an optimal capturing operation in accordance with a user's usage situation and behavior pattern.

 Further, in the above-described embodiment, even when the standby state is set in the first communication system network having a high priority (step S25), the capturing operation is performed on each communication system network. However, when the acquisition process for the first communication system network having a high priority is successful and the communication system is in the standby state, the channel is lost without performing the acquisition operation for the other communication system networks. You may comprise so that the standby state in a 1st communication system network may be maintained.

 Further, in the above-described embodiment, when the reselection time RT3 for the third communication system network having a low priority fails to communicate with the third communication system network (when acquisition fails or the continuous standby time waits stably). However, the reselection time for a communication system network with a low priority may be unchanged. In this case, if NO is determined in step S83, the process proceeds to step S93. If NO is determined in step S108, the process proceeds to step S113, where it is determined to be out of service. When this out-of-service state is entered, all the reselection timers are stopped and a transition to the out-of-service state is made. Then, a predetermined time is measured by a timer separately provided for out-of-service processing, and when the predetermined time has elapsed, processing of the capture operation flow for the first communication system network shown in FIG. 2A is started.

 In the above-described embodiment, in the standby processing routine for the second communication system network shown in FIG. 3B and the standby processing routine for the third communication system network shown in FIG. When the standby state is entered in S105, the flow proceeds to step S1 in FIG. 2A in steps S66 and S106. However, when the standby state is entered in steps S65 and S105, the process is started in steps S64 and S104. If it is detected that any of the reselection timers has counted up, the process may proceed to steps S66 and S106. In this case, the frequency of transition to step S1 is reduced, and the processing load and power consumption can be reduced.

 In the above-described embodiment, the degree of communication failure with respect to each communication system network is determined according to the number of acquisition failures and the continuous standby time that is less than the stable standby time ST. Instead, the degree of communication failure may be obtained according to other communication failure states, and the reselection time for each communication system network may be set according to this degree.

1 is a configuration block diagram of a wireless communication device according to an embodiment of the present invention. It is a 1st flowchart which shows operation | movement of the radio | wireless communication apparatus in one Embodiment of this invention. It is a 2nd flowchart which shows operation | movement of the radio | wireless communication apparatus in one Embodiment of this invention. It is a 3rd flowchart which shows operation | movement of the radio | wireless communication apparatus in one Embodiment of this invention.

Explanation of symbols

 DESCRIPTION OF SYMBOLS 1 ... Wireless communication part, 2 ... Key input part, 3 ... Display part, 4 ... Audio | voice output part, 5 ... Camera part, 6 ... Control part, 6a ... Communication state detection part, 6b ... Timer control part, 6c ... Capture control , 7... First reselection timer, 8... Second reselection timer, 9... Third reselection timer, 10.

Claims (11)

A communication means for establishing communication connection with any one of a plurality of communication system networks and performing wireless communication with a base station, and a priority set in advance for the plurality of communication system networks every predetermined time Capture control means for controlling the communication means so as to sequentially capture according to the degree, the communication means is a wireless communication device that performs communication connection with the communication system network that has succeeded in capture,
Communication failure detection means for detecting communication failure for each communication system network;
A predetermined time setting means for obtaining a degree of communication failure for each communication system network detected by the communication failure detection means, and setting the predetermined time for each communication system network based on the degree of communication failure; Prepared,
The acquisition control means controls the communication means to acquire each communication system network in accordance with the elapse of the predetermined time set by the predetermined time setting means;
A wireless communication apparatus. The communication failure detection means detects a capture failure for each communication system network as the communication failure.
The wireless communication apparatus according to claim 1. The predetermined time setting means counts the number of acquisition failures for each communication system network, and increases the predetermined time for the communication system network corresponding to the count value when the count value exceeds a predetermined threshold value. Let
The wireless communication apparatus according to claim 2. The predetermined time setting means initializes the degree of communication failure for the communication system network that has transitioned to the standby state when the communication connection by the communication means has been completed and the standby state has transitioned.
The wireless communication device according to claim 1, wherein the wireless communication device is a wireless communication device. The communication failure detection unit detects a communication failure for the communication system network that has transitioned to the standby state after the communication connection by the communication unit has been completed and the standby state has been transitioned.
The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is a wireless communication apparatus. The predetermined time setting means, when the communication failure detection means detects the communication failure within a predetermined standby time after transitioning to the standby state, a communication failure for the communication system network that has transitioned to the standby state. Increase the degree,
The wireless communication apparatus according to claim 5. When the predetermined standby time exceeds the predetermined standby time after the transition to the standby state, the predetermined time setting means determines the degree of communication failure with respect to the communication system network that has transitioned to the standby state. ,
The wireless communication apparatus according to claim 5 or 6, The communication failure detection means detects a capture failure for each communication system network as a first communication failure, and detects a communication failure that occurs within a predetermined standby time after transitioning to a standby state for each communication system network. Detected as a second communication failure,
The predetermined time setting means, when a total value of the first communication failure degree and the second communication failure degree is equal to or greater than a predetermined value, the predetermined time setting means for the communication system network corresponding to the total value. Increase time,
The wireless communication device according to claim 1, wherein the wireless communication device is a wireless communication device. After the communication connection by the communication means is completed and transition to the standby state, the acquisition control means performs the acquisition operation continuously for a predetermined number of times for a communication system network in which communication failure has occurred. Control
The predetermined time setting means decreases the predetermined number of times based on the degree of communication failure for the communication system network in which the communication failure has occurred.
The wireless communication device according to claim 1, wherein the wireless communication device is a wireless communication device. The predetermined time setting means sets the predetermined time based on the degree of communication failure when the remaining amount of the battery is equal to or less than the predetermined remaining amount and when the battery is not charged. To
The wireless communication device according to claim 1, wherein the wireless communication device is a wireless communication device. A communication connection is established with any one of a plurality of communication system networks to perform wireless communication with a base station, and a predetermined priority is set for the plurality of communication system networks every predetermined time. A wireless communication method for performing communication connection with a communication system network that has succeeded in capturing,
A first step of detecting a communication failure for each communication system network;
A second step of obtaining a degree of communication failure for each communication system network detected by the first step;
A third step of setting the predetermined time for each communication system network based on the degree of communication failure;
A fourth step of capturing each communication system network according to the passage of the predetermined time set in the third step;
A wireless communication method comprising:

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