JP2009267847A - Radio terminal equipment and radio network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve high speed re-selection processing suitable for a radiowave environment without deviating from the original purpose of re-selection. <P>SOLUTION: A control part 18 is provided with a function of trying a transmitting operation by changing a communication system to be used by a communication part 11, performs a transmitting operation by the communication system successively selected based on a priority list to a base station in a standby state, stores, each time the transmitting operation fails, the factor of the failure in the prescribed region of a storage part 17 in association with the communication system to be used for the transmitting operation, and changes a priority list by referring to the factor of the failure stored in a storage part 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless terminal device and a wireless network system that connect to a network via a base station.

In the wireless terminal device described above, it is required to always select the best base station in the radio wave condition or traffic environment in order to maintain the communication quality.
Conventionally, in order to capture neighboring cells at high speed, information on neighboring cells is received from the base station of the currently waiting cell, and cells are detected according to the priority order included in the neighboring cell information. A wireless terminal device compatible with W-CDMA (Wideband-Code Division Multiple Access) is known.
As described above, a method for reporting information on neighboring base stations from the base station is also known in CDMA2000 1x.

  In recent years, wireless terminal devices that can stand by in a plurality of frequency bands (communication systems) are appearing. In addition, an 800 MHz band (band class 3) infrastructure has been established since the old days. However, the traffic has become crowded. Therefore, newly allocated infrastructure of 800 MHz band (band class 0) and 2 GHz high frequency band (band class 6) is being newly established. In such a tri-band compatible environment, the new frequency band is naturally more advantageous for traffic, and there is a demand to set the priority higher.

  However, in terms of infrastructure, band class 3 is an overwhelmingly stable cover area. For this reason, once waiting in the frequency band of the band class 3, the wireless terminal device can be operated without any problem only by the soft handoff in this frequency band. For this reason, if there is no opportunity for handoff, the standby class cannot be changed to the band class 6 or 0 frequency band.

In order to avoid such a problem, a process called “reselection” is known. “Reselection” is a process of releasing a standby at that frequency (session release) and capturing another high-frequency band while waiting at any frequency. That is, if there is a frequency band with high priority in the vicinity, the standby frequency band can be changed to a higher frequency band by performing location registration processing in that frequency band. Reselection refers to a reselection process of a communication system under such a predetermined condition (see, for example, Patent Document 1).
JP 2007-150478 A

The above-described reselection process is normally performed at predetermined intervals at time intervals counted by a reselection timer.
There are two types of reselection timers: a long-cycle timer prepared for the case where the standby state lasts for a relatively long time, and a short-cycle timer that operates when a call ends or a handoff occurs. Reselection processing always occurs.
For this reason, useless reselection processing occurs in an area where there is no communication system with higher priority defined by PRL (Preferred Roaming List) or the like in the vicinity. That is, a wasteful communication system capture operation is performed, and power is consumed for that purpose.
In particular, the short-cycle timer is prepared assuming changes in the radio wave environment where the wireless terminal device is placed, but it can spontaneously capture changes in the state of the base station and the radio wave environment. Therefore, useless reselection processing frequently occurs, and a capturing operation of the communication system may be performed.

  An object of the present invention is to provide a wireless terminal device and a wireless network system capable of selecting a communication system suitable for a radio wave environment at high speed and efficiently.

  A first aspect of the present invention is a wireless terminal device capable of switching between and waiting for a plurality of communication systems, and a communication unit capable of selecting one of the plurality of communication systems and wirelessly communicating with a base station A storage unit that stores a priority list in which possible communication systems are defined in order of priority; and a control unit that attempts a transmission operation by changing the communication system used by the communication unit, the control unit includes: For a base station that is waiting, a transmission operation is performed in a communication system that is sequentially selected based on the priority list, and each time the transmission operation fails, the failure factor is assigned to the communication system used for the transmission operation. The priority list is updated by referring to the cause of failure stored in the storage unit in association with a predetermined area of the storage unit.

  Further, in the wireless terminal device of the present invention, when the control unit fails in all transmission operations of the communication system defined in the priority list, the priority stored in the storage unit after the transmission operation ends. The priority list may be updated so that the priority order of the list is changed based on the cause of failure.

  Further, in the wireless terminal device of the present invention, the control unit transmits while waiting in the first communication system, fails to perform a transmission operation in the first communication system, and performs the second communication. If the transmission operation is successful in the system, the priority list may be updated so that the first communication system is the communication system having the lowest priority and the priorities of the other communication systems are sequentially increased. Good.

  Further, in the wireless terminal device of the present invention, the control unit controls to maintain the priority of other communication systems including the communication system when the transmission operation is successful in the communication system that has been waiting. Also good.

  In the wireless terminal device of the present invention, the control unit has a valid timer for managing a valid period of a priority list stored in the storage unit, and the valid timer is changed when the priority of the communication system is changed. The timing list of the communication system stored in the storage unit may be returned to the default value when the time counting by the above is started and a timeout of the valid timer is detected.

  Further, in the wireless terminal device of the present invention, the cause of failure of the transmission operation includes a partial restriction notifying that the base station partially restricts access to its own base station, the control unit Is started by the start of the transmission operation, and when it expires, the first transmission retry timer that updates the priority list based on the failure factor at that time, and the count cycle is shorter than the first transmission retry timer A second transmission retry timer, and when the transmission operation fails and the cause of the failure in the transmission operation is other than the partial restriction, the first timer sets an interval until the transmission operation is retried. And when the second transmission retry timer times out, the transmission operation is retried when the base station is partially restricted, and the second transmission retry timer counts If transmission operation in time to was not successful, then it may be subjected to trial acquisition of high-priority communication system.

  According to a second aspect of the present invention, there is provided a wireless network system including a plurality of base stations and mobile terminal devices capable of supporting a plurality of communication systems, wherein the base station includes at least the plurality of communications. Broadcast information identifying another communication system in the vicinity is transmitted by one communication system of the systems, and the mobile terminal device can select one of the plurality of communication systems and wirelessly communicate with a base station A communication unit, a storage unit that stores a priority list in which a plurality of usable communication systems are defined in order of priority, and a control unit that attempts a transmission operation by changing the communication system used by the communication unit. The control unit makes a call to the waiting base station using the communication system sequentially selected based on the priority list, and each time the call operation fails, each control unit has a priority. The assigned failure factor is stored in a predetermined area of the storage unit in association with the communication system used for the transmission, and the priority list is updated with reference to the failure factor stored in the storage unit To do.

  According to the present invention, it is possible to select a communication system suitable for a radio wave environment at high speed and efficiently.

  FIG. 1 is a diagram showing an example of a system configuration of a wireless network system according to the present invention.

As shown in FIG. 1, base stations A, B, and C all perform wireless communication with a wireless terminal (here, mobile phone 10) using a CDMA digital mobile communication system.
These base stations A, B, and C perform radio communication with each mobile phone 10 using radio signals in different frequency bands. Further, these base stations A, B, and C constitute different communication systems, and the entire wireless communication system is constituted by a plurality of communication systems.

  Here, one base station A, B, and C constituting the wireless communication system is shown for convenience, but each may be configured to have a plurality of base stations. In addition to the communication system using these base stations A, B, and C, there may be more communication systems. In addition, the cellular phone 10 uses a radio communication connection with a radio communication system having the base stations A, B, and C or a radio communication connection with each base station in each communication system according to the radio wave intensity and instructions from the base station. Switch accordingly. By this switching, a process for always maintaining a good standby state with the communication system and the base station is performed.

Specifically, in the above-described wireless communication system, the mobile phone 10 performs a system capturing operation in order from the communication system with the highest priority, and enters a standby state in the captured communication system. If the communication system with the highest priority cannot be captured, the mobile phone 10 waits for the communication system with the next highest priority.
In addition, since the mobile phone 10 in the standby state in the communication system with a low priority shifts to a higher-level communication system, the mobile phone 10 shifts from the standby state to the reselection operation every certain period, and the communication with the highest priority again. Start the capture operation from the system. Also, when the mobile phone 10 has lost the channel from the standby state, the next communication system capture operation is started when the channel scan is repeated a certain number of times in the same communication system and fails a certain number of times.

  In the example of FIG. 1, it is assumed that the priority of each communication system is given in the order of communication system # 1 → communication system # 2 → communication system # 3. In this case, when the channel acquisition of the communication system # 1 fails, the mobile phone 10 performs a channel scan operation in the communication system # 2 (A-2). In addition, when the mobile phone 10 is in the standby state for the communication systems # 2 and # 3 and the reselection operation is activated due to a timeout, the channel scan operation of the communication system # 1 is started (B-1). , C-1). Details will be described later.

  FIG. 2 is a diagram illustrating an example of an external structure of the wireless terminal device according to the embodiment of the present invention. Here, a foldable mobile phone 10 is assumed as the wireless terminal device.

  As shown in FIG. 2, the mobile phone 10 includes an upper housing 101, a lower housing 102, and a hinge portion 103.

FIG. 2A is a diagram showing a state in which the mobile phone 10 is opened (open state), and FIG. 2B is a diagram showing a state in which the mobile phone 10 is folded (closed state). .
As shown in FIG. 2A, the display unit 16 is disposed on the upper casing 101 so as not to be exposed to the outside when the cellular phone 10 shown in FIG. 2B is closed.
In addition, as shown in FIG. 2A, the lower casing 102 is provided with an operation unit 12 on one surface that is not exposed to the outside when the cellular phone 10 shown in FIG. 2B is closed.

The hinge unit 103 opens and closes the upper housing 101 and the lower housing 102, and allows the transition between the open state of the mobile phone 10 shown in FIG. 2 (a) and the closed state shown in FIG. 2 (b). It is a hinge mechanism which has. Note that the open / closed state of the mobile phone 10 is monitored by a control unit described later, and the control unit (not shown) can detect the closed state of the mobile phone 10.
Specifically, the closed state is detected by the control unit monitoring whether or not a detection switch (not shown) of the lower casing 102 is pressed by a projection (not shown) disposed on the upper casing 101, for example. That is, if the detection switch is pressed, it is determined to be in a closed state, otherwise it is determined to be in an open state. The open / close detection is not limited to the switch, and may be various sensors.

  FIG. 3 is a block diagram showing an internal configuration of the electrical system of the wireless terminal device according to the embodiment of the present invention. Here, a mobile phone 10 is illustrated as a mobile terminal device.

As shown in FIG. 3, the mobile phone 10 is wirelessly connected to a base station (A, B, C in FIG. 1), and can capture a plurality of communication systems possessed by each base station. Then, communication is performed according to a predetermined protocol in the communication system captured with the base station.
Therefore, the mobile phone 10 includes a communication unit 11, an operation unit 12, a voice input / output unit 13, a speaker 14, a microphone 15, a display unit 16, a storage unit 17, and a control unit 18. Composed.

The communication unit 11 captures a plurality of communication systems and follows a communication protocol such as CDMA2000 1x (hereinafter simply referred to as 1x) or EVDO (Evolution-Data Optimized / only) and a base station (not shown) connected to the communication network. Wireless communication between the two.
EVDO communication is faster than 1x communication, and 1x communication is different from EVDO communication in that it supports voice communication in addition to data communication.

  The operation unit 12 includes keys to which various functions are assigned, such as a power key, a call key, a numeric key, a character key, a direction key, a determination key, and a call key. When these keys are operated by the user, the operation unit 12 generates a signal corresponding to the operation content, and inputs the signal to the control unit 18 as a user instruction.

The audio input / output unit 13 processes an audio signal output from the speaker 14 and an audio signal input from the microphone 15.
That is, the voice input / output unit 13 amplifies the voice input from the microphone 15, performs analog-digital conversion, further performs signal processing such as encoding, converts it into digital voice data, and outputs it to the control unit 18. To do.
The audio input / output unit 13 performs signal processing such as decoding, digital-analog conversion, and amplification on the audio data supplied from the control unit 18, converts the audio data into an analog audio signal, and outputs the analog audio signal to the speaker 14.

The display unit 16 is configured using a display device such as a liquid crystal display panel or an organic EL (Electro-Luminescence) panel, for example, and displays an image corresponding to a video signal supplied from the control unit 18.
The display unit 16 is, for example, a telephone number of a callee at the time of outgoing call, a telephone number of a callee at the time of incoming call, contents of received mail or outgoing mail, date, time, remaining battery level, success / failure of outgoing call, standby screen, etc. Display information and images.

The storage unit 17 stores various data used for processing in the control unit 18.
The storage unit 17 includes, for example, a program provided in the control unit 18, an address book for managing personal information such as a telephone number and an e-mail address of a communication partner, a voice file for reproducing a ring tone and an alarm sound, and a standby screen It holds image files, various setting data, temporary data used in the program processing.
Here, a call failure factor table 170 shown in FIG. 4 to be described later, and a priority list such as PRL shown in FIGS. 6A, 6B, and 6C (priority list 171a set by default, updated). The priority lists 171b) are assigned to predetermined areas and stored. Details of the data structure and the like will be described later.

  The above-described storage unit 17 includes, for example, a nonvolatile storage device (nonvolatile semiconductor memory, hard disk device, optical disk device, etc.), a random accessible storage device (eg, SRAM, DRAM), or the like.

The control unit 18 controls the overall operation of the mobile phone.
That is, the control unit 18 controls the operation of each block described above so that various processes of the mobile phone are executed in an appropriate procedure according to the operation of the operation unit 12. The various processes include, for example, a voice call performed via a circuit switching network, creation and transmission / reception of an e-mail, browsing of a Web (World Wide Web) site on the Internet, and the like. The operation of each block includes transmission / reception of signals in the communication unit 11, input / output of audio in the audio input / output unit 13, and display of images on the display unit 16.
The control unit 18 includes a computer (microprocessor) that executes processing based on a program (operating system, application program, etc.) stored in the storage unit 17. In accordance with the procedure instructed in this program, the control unit 18 executes the processing described above.
That is, the control unit 18 sequentially reads instruction codes from programs such as an operating system and application programs stored in the storage unit 17 and executes processing.

The control unit 18 also has a function of changing the communication system used by the communication unit 11 and trying a transmission operation. Specifically, a communication system that performs a transmission operation in a communication system that is sequentially selected based on a priority list with respect to a standby base station, and uses the cause of the failure for transmission whenever the transmission operation fails Is stored in a predetermined area of the storage unit 17 and the priority list is updated with reference to the cause of failure stored in the predetermined area of the storage unit 17.
For this reason, the control unit 18 has a main control unit 180, a notification information acquisition unit 181, a communication system selection unit 182, and a capture trial control unit 183, as shown in FIG. And a priority list update unit 184, transmission retry timers x and y, and a validity period timer z.

  The broadcast information acquisition unit 181 acquires a list of neighboring base stations acquired from the standby base station via the communication unit 11, or information related to regulations (full regulation or partial regulation) to obtain a communication system selection unit 182; Delivered to the capture trial control unit 183.

  The communication system selection unit 182 refers to a priority list in which usable communication systems are defined in order of priority, such as a PRL stored in a predetermined area of the storage unit 17, and the communication unit 11 communicates with the base station. A communication system to be used is selected and delivered to the acquisition trial control unit 183.

The acquisition trial control unit 183 controls the communication unit 11 using the communication system selected by the communication system selection unit 182 for the standby base station, and performs an acquisition request generated by a user operation or the like. Also performs outgoing call processing when it arrives.
When the transmission operation fails, if the cause of the failure in the transmission operation is other than partial restriction, the capture trial control unit 183 manages the interval until the retry of the transmission operation with the transmission retry timer x, and obtains notification information. When the transmission retry timer y times out when the base station recognizes that partial restriction is applied based on the information acquired by the unit 181, the transmission operation is retried and the transmission operation is performed within the time counted by the transmission retry timer y. If is not successful, an acquisition attempt is made by the next highest priority communication system.
It is assumed that the transmission retry timer y has a count cycle shorter than that of the transmission retry timer x that updates the priority list based on the failure factor at that time when the time is started by the start of the transmission operation and time-out occurs. The validity period timer z is a timer that monitors the validity time of a priority list such as PRL, and is managed by the priority list update unit 184.

The priority list updating unit 184 stores the cause of the failure in a predetermined area of the storage unit 17 in association with the communication system used for the transmission operation every time the transmission operation fails under the control of the acquisition trial control unit 183. The priority list 171a is updated with reference to the failure factor stored in the storage unit 17.
Specifically, for example, when the transmission operation fails in all of the communication systems defined in the priority list 171a set by default, the priority list update unit 184 stores the storage unit 17 after the transmission operation is completed. The priority list 171a is updated so that the priority order of the communication systems in the priority list 171a is changed based on the cause of failure.
In addition, when a call is made while waiting in the first communication system, the call operation in the first communication system fails, and the call operation in the second communication system is successful, the priority list update unit In step 184, the first communication system is the communication system having the lowest priority, and the priority list 171a is updated so that the priorities of the other communication systems are sequentially increased. Further, when the transmission operation is successful in the waiting communication system, the priority list update unit 184 maintains the priority of other communication systems including the communication system.
Further, the priority list update unit 184 starts the time measurement by the timer z when the priority of the communication system is changed, and when the timeout of the timer z is detected, the priority list update unit 184 stores the priority list of the communication system stored in the storage unit 17. Restore the default value.

The main control unit 180 serves as an interface with peripheral control blocks such as the communication unit 11, the operation unit 12, the voice input / output unit 13, the display unit 16, the storage unit 17 and the like, and also serves as a standby base station. On the other hand, the transmission operation is performed in the selected communication system.
Whenever the transmission operation fails, the main control unit 180 stores the cause of the failure in a predetermined area of the storage unit 17 in association with the communication system used for the transmission operation, and stores the failure cause stored in the storage unit 17. It operates as a control center as the control unit 18 that updates the priority list 171a with reference to the factors.
For this purpose, the main control unit 180 performs sequence control relating to the above-described delivery of data among the notification information acquisition unit 181, the communication system selection unit 182, the capture trial control unit 183, and the priority list update unit 184. I do.

  By the way, according to the wireless terminal device according to the embodiment of the present invention, the order of priority lists such as PRL is rearranged using the failure factor of the transmission operation, and reselection processing and channel scanning are performed. Here, the failure factor used for the transmission operation is shown in a table format in FIG. 4, for example, and is assigned to a predetermined area of the storage unit 17 and stored.

FIG. 4 is a diagram illustrating an example of a data structure of the transmission failure factor table 170 stored in the storage unit 17.
Here, “successful transmission or not yet captured”, “partial regulation”, “other (release order / status timer TO)”, “fade timer”, “overreach”, “redirection”, “all regulations, Alternatively, “lock order” and “capture failure” are used as failure factors, and each is assigned a high priority in ascending order.
The priority list 171a is updated based on the failure factor described above, and the verification is executed by the priority list update unit 184 referring to the transmission failure factor table 170.

Here, the “status timer” is a timer that monitors the staying time (maximum time) of each state of the protocol that changes according to the event in the transmission operation. The status timer times out when the protocol sequence does not advance in an overreach environment or a weak electric field environment.
The “lock order” is a protocol message transmitted from the base station to the wireless terminal device, and the received wireless terminal device is prohibited from transmitting to the base station. In addition, the “fade timer” is a timer that times out (T40 mT.O) when no normal frame is received for several seconds, that is, monitors a lost reception channel.
In addition, “redirection” refers to a wireless terminal device that is in a standby state with respect to its own base station due to occurrence of communication failure or congestion of transmission / reception data in the base station. This is a process for prompting the station to switch the standby destination.

  One of the causes of failure is "capture failure". This is because the channel could not be found by channel scanning at the time of standby, or the channel was found but the message could not be received, and the standby channel. That fails to receive.

FIG. 5 is a flowchart showing the basic operation of the call retry process of the wireless terminal device according to the embodiment of the present invention.
Hereinafter, the transmission retry operation of the wireless terminal device according to the embodiment of the present invention shown in FIGS. 2 to 4 will be described in detail with reference to the flowchart of FIG.

Prior to the description of the operation based on the flowchart of FIG. 5, the mobile phone 10 (the control unit 18) acquires the neighboring base station list from the base station A (B, C) that is on standby by the notification information acquisition unit 181, and controls It is assumed that the information related to the information is also acquired and stored in a predetermined area of the storage unit 17.
First, a transmission request is generated when the user operates a predetermined button of the operation unit 12, and the capture trial control unit 183 of the control unit 18 receives this, and selects a communication system (highest priority) in a standby state. By instructing the communication unit 11 to use the transmission operation, a transmission operation routine is started for the base station (step S51). At this time, the transmission retry timer x is also started.

Here, when the transmission operation fails (step ST52 “No”), the capture trial control unit 183 acquires the failure factor. Then, only when the failure factor is a factor for performing a call retry operation, such as when receiving a lock order or out-of-service transmission (step S53 "No"), the failure factor is associated with the communication system used for transmission. And stored in a predetermined area of the storage unit 17 (step S54).
The above-described series of processing is repeatedly executed until the timeout of the transmission retry timer x is detected (Step S55 “No” → Step S51). Then, the transmission operation by the communication system with the next highest priority is instructed and executed (step S56).
Then, upon detection of timeout of the transmission retry timer x (“Yes” in step S55), the transmission routine is temporarily given up, and the priority list updating unit 184 performs priority update processing of the priority list 171a such as PRL. (Step S57).
When the transmission operation is successful in the transmission success determination process in step S52 (step S52 “Yes”) and when the failure factor is a factor that does not perform the transmission factor retry operation in the failure factor determination process of step S53. Similarly, in step S53 “Yes”, the priority list update unit 184 executes priority update processing of the priority list 171a such as PRL stored in a predetermined area of the storage unit 17 (step S57). .

An example of the priority update process performed by the priority list update unit 184 described above is developed and shown on the memory (storage unit 17) in FIGS. 6 (a), 6 (b), and 6 (c).
FIG. 6A shows, as Example 1, a case where transmission operations by all communication systems in the priority list 171a set by default have failed. FIG. 6B shows, as Example 2, a case where the transmission operation is successful in the communication system B (second communication system) in a state where the communication system A (first communication system) is in standby. FIG. 6C shows, as Example 3, a case where the transmission operation is successful while waiting in the communication system A. 6A to 6C show the data structure of the priority list before and after the update in each state.

Hereinafter, FIGS. 6A to 6C will be described in detail.
Example 1 in FIG. 6A shows a case where the transmission operation in all communication systems fails. In this case, every time the transmission operation in each communication system fails, the capture trial control unit 183 acquires the failure factor. First, the acquisition trial control unit 183 acquires the communication system A with reference to the priority list 171a whose priority is defined by default. Here, the capture trial control unit 183 generates a reason for the failure when the capture itself fails, and if the capture is successful but the transmission is not successful, the notification information acquisition unit The reason for the outgoing call failure is extracted based on the information obtained by the above.
Then, according to the procedure described with reference to FIG. 5, in the order of the priority list 171a, the other communication systems perform capture processing and perform a transmission operation. In this example, there is an example in which transmission fails for all communication systems. Because it is shown, it is assumed that it has failed. As a result, as shown in the priority list 171ab, failure factors for each communication system are prepared.
When the failure has occurred, the priority list update unit 184 determines the next acquisition order for each communication system by comparing the failure factor extracted by the acquisition trial control unit 183 with the transmission failure factor table shown in FIG. Sort in descending order of priority. That is, the priority list 171ac is generated. Then, the storage unit 17 is updated so as to replace the priority list 171a set by default with the priority list 171ac. Thereafter, the transmission operation is performed using the updated priority list 171ac.

Further, Example 2 in FIG. 6B is an example in which the transmission operation is successful in the communication system B having the second highest priority. In other words, in spite of waiting in the communication system A having the highest priority, as shown in 171bb, the call operation in the communication system A fails and the communication system B having the second highest priority is used. This is a case where the calling operation is successful. In this case, the priority list update unit 184 changes the communication system A that has failed in the transmission operation to the communication system with the lowest priority, and performs a table operation that increments the priority of the other communication system by +1. 171bc is generated and the storage unit 17 is updated.
Further, FIG. 6C, Example 3 is an example in which the transmission operation is successful in the waiting communication system. That is, this is a case where the call operation in the communication system B is successful, as indicated by 171bc, while waiting in the communication system B having the second highest priority. In this case, the priority list update 184 does not change the priority order of the communication system as indicated by 171 cc.

It should be noted that it is not preferable to leave the changed order after changing the priority order of the communication system. That is, the default priority order set by the side managing a plurality of wireless communication terminals to increase the traffic partition is not preferable. Therefore, a mechanism for returning the priority order to the original (default) is required.
Therefore, the priority list update unit 184 controls the timer z that manages the validity period of the priority list. In other words, when a change occurs in the priority order of the communication system, the timer z is started. When a timeout of the timer z is detected, the new priority list (171ac, 171bc, 171cc) is returned to the priority list 171a set by default.
7A and 7B are flowcharts showing the system priority re-update process.
FIG. 7A shows a process for starting the timer z, and FIG. 7B shows a process when the timer z times out.

As shown in FIG. 7A, the priority list update unit 184 first determines the priority of the communication system based on the failure factor defined in the transmission failure factor table 170 under the control of the acquisition trial control unit 183. It is determined whether or not a change has occurred (step S71). Here, when the system priority is changed (step S71 “Yes”), the priority list update unit 184 starts the timer z and starts monitoring the effective period by the timer z (step S72).
Further, as shown in FIG. 7B, when a timeout indicating the valid period of the timer z is detected (step S73 “Yes”), the priority list update unit 184 stores the priority list 171b in the storage unit 17. A process (restore) for returning to the default setting priority list 171a saved in the predetermined area is executed (step S74).

As described above, according to the wireless terminal device according to the embodiment of the present invention, simple and efficient system selection processing and channel scan are performed by rearranging the priority list by reflecting the failure factor of the transmission operation. Can contribute to speeding up of the capturing operation and power saving.
In addition, once the priority of the communication system is changed, the priority set by default can be restored, so that the present invention can be realized without impairing existing specifications.

  Note that, according to the above-described wireless terminal device according to the embodiment of the present invention, a partial restriction that partially restricts access by the base station is defined as one of the failure factors of the transmission operation. In the partial restriction, when the restriction rate is high, the acquisition retry for one communication system is repeated during the period that the transmission retry timer x keeps timing. During this period, acquisition may not be successful and thus may end with a transmission operation by one communication system. In that case, since the radio wave conditions of other communication systems cannot be grasped, the advantages of the present invention cannot be utilized. For this reason, a function for limiting the operation time is added to the transmission operation during partial regulation.

  FIG. 8 is a flowchart showing a partial restriction operation of the wireless terminal device according to the embodiment of the present invention. 8 is performed in step S52 in the transmission process shown in FIG.

In FIG. 8, first, the acquisition trial control unit 183 is notified by the broadcast information acquisition unit 181 that partial restriction is applied to the standby base station (“Yes” in step S81), the priority list 171 is displayed. It is determined whether there is a communication system that has not yet attempted acquisition (step S82).
If there is a communication system that has not yet attempted acquisition (step S82 “Yes”), the acquisition trial control unit 183 performs a partial restriction operation for 10 seconds, for example, under monitoring by the transmission retry timer y. (Step S83). Here, if there is no system that has been scanned (step S82 “No”), the normal partial restriction operation is continued (step S84).
Subsequently, when the acquisition trial control unit 183 detects that the transmission operation is not successful even after 10 seconds have elapsed (step S85 “Yes”), the communication unit 11 is caused to perform a channel scan by the communication system having the next highest priority. An instruction is given (step S86). If the transmission is successful within 10 seconds (“No” at step S85), the display unit 16 displays that fact and notifies the user (step S87). When partial restriction is not applied (step S81 “No”), the capture trial control unit 183 performs a normal call retry operation (step S88). That is, the process proceeds to step S53 in FIG.

In other words, according to the wireless terminal device according to the embodiment of the present invention, when there is a communication system that has not yet performed channel scanning in the priority list 171, the operation during partial restriction is performed even after 10 seconds have elapsed. If unsuccessful, control is performed to execute the channel scan of the next communication system.
When the transmission is performed in the partially regulated communication system after the channel scan of all the communication systems defined in the priority list 171 other than the partially regulated communication system, the normal part is not started without starting the timer y. It is supposed to perform outgoing calls during regulation. By controlling in this way, all communication systems can be captured within the transmission operation even in an environment where the base station is partially restricted, so that the possibility of successful call can be improved.

  The partial restriction by CDMA determines whether or not transmission is possible with a random number with respect to the probability (transmission possibility probability) specified at the transmission timing every time. However, if the specified probability is low, it takes considerable time until transmission is possible. For example, in Japan, there is a regulation for a maximum of 40 seconds (timer x) for a transmission operation. For this reason, if the partial restriction is a strict value (probability value), there is a high possibility that the transmission will be terminated by a transmission operation to one communication system. Therefore, here, the partial retry operation time is limited by using the transmission retry timer y whose count cycle is sufficiently shorter than 40 seconds (transmission retry timer x).

  As described above, according to the wireless terminal device according to the embodiment of the present invention, information (transmission failure factor) obtained by the existing transmission retry operation is utilized without adding a new system scan operation. Therefore, a more optimized reselection operation can be performed. Further, once the priority is changed, the original priority can be restored by providing a timer z. Therefore, a temporary system scan operation suitable for the radio wave environment where the wireless terminal device is placed can be performed without departing from the purpose of the original reselection. In addition, it is possible to execute a system scan of all communication systems in one outgoing operation during partial regulation. This makes it possible to realize an appropriate system scan operation that does not end with a transmission operation to only one communication system even during partial regulation.

In addition, according to the wireless network system according to the embodiment of the present invention, it is not necessary to change the network side device including the base station and the like, so that it is possible to immediately cope with infrastructure maintenance.
The above-described radio communication system according to the embodiment of the present invention is not limited to CDMA2000, and is compatible with radio communication schemes such as W-CDMA and GSM / UMTS (Universal Mobile Telecommunication System / Global System for Communications). The present invention can be applied to all wireless terminal devices. In addition, the mobile phone 10 is illustrated as the wireless terminal device. However, the mobile terminal 10 is not limited to the mobile phone 10 and can be used for a communication module mounted on a vehicle, in addition to a PDA (Personal Digital Assistants), a game machine, etc. Can be applied similarly.

  In addition, the functions of the constituent blocks included in the wireless terminal device according to the embodiment of the present invention may be realized entirely by software, or at least a part thereof may be realized by hardware. For example, the data processing in the main control unit 180, the notification information acquisition unit 181, the communication system selection unit 182, the capture trial control unit 183, and the priority list update unit 184 constituting the control unit 18 is performed by one or a plurality of programs. It may be realized above. In addition, at least a part of it may be realized by hardware.

It is a figure which shows an example of the system configuration | structure of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows an example of the external appearance structure of the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is a block diagram which shows the internal structure of the electric system of the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the data structure of the transmission failure factor table which the wireless terminal device which concerns on embodiment of this invention uses. It is a flowchart which shows the transmission retry operation | movement of the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is the figure which expanded and showed the content of the update process of the priority list | wrist of the radio | wireless terminal apparatus which concerns on embodiment of this invention on memory. It is a flowchart which shows the operation | movement of the update process of the priority list of the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is a flowchart which shows the partial control operation | movement of the radio | wireless terminal apparatus which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Mobile phone, 11 ... Communication part, 12 ... Operation part, 13 ... Voice input / output part, 14 ... Speaker, 15 ... Microphone, 16 ... Display part, 17 ... Memory | storage part, 18 ... Control part, 20 ... Base station ( Base station apparatus), 30 ... communication network, 40 ... BCMCS server, 180 ... main control unit, 181 ... broadcast information acquisition unit, 182 ... communication system selection unit, 183 ... capture trial control unit, 184 ... priority list update unit, 170: Transmission failure factor table, 171a: Old priority list, 171b: Priority list, A, B, C ... Base station, x, y ... Transmission retry timer, z ... Timer (valid period).

Claims (7)

A wireless terminal device that can switch and wait for a plurality of communication systems,
A communication unit capable of selecting one of the plurality of communication systems and wirelessly communicating with a base station;
A storage unit for storing a priority list in which usable communication systems are defined in order of priority;
A control unit that changes the communication system used by the communication unit and tries a transmission operation, and
The controller is
For a base station that is waiting, a transmission operation is performed in a communication system that is sequentially selected based on the priority list, and each time the transmission operation fails, the failure factor is assigned to the communication system used for the transmission operation. The wireless terminal device, wherein the wireless terminal device stores the associated information in a predetermined area of the storage unit, and updates the priority list with reference to the cause of failure stored in the storage unit. The controller is
When all the transmission operations of the communication system defined in the priority list have failed, after the transmission operation ends, the priority order of the priority list stored in the storage unit is changed based on the cause of failure, The wireless terminal apparatus according to claim 1, wherein the priority list is updated. The controller is
The first communication is performed when the first communication system makes a call while waiting in the first communication system, the transmission operation fails in the first communication system, and the transmission operation succeeds in the second communication system. The wireless terminal apparatus according to claim 1, wherein the priority list is updated so that the system is a communication system having the lowest priority, and the priorities of other communication systems are sequentially increased. The controller is
The wireless terminal device according to claim 1, wherein, when the transmission operation is successful in the communication system that has been waiting, the priority of another communication system including the communication system is maintained. The control unit has an effective timer for managing the effective period of the priority list stored in the storage unit,
When the priority of the communication system is changed, timing by the effective timer is started, and when a timeout of the effective timer is detected, the priority list of the communication system stored in the storage unit is returned to a default value. The wireless terminal device according to any one of claims 1 to 4. The cause of failure of the transmission operation includes a partial restriction that informs that the base station partially restricts access to the base station,
The controller is
When the transmission operation starts and expires, a first transmission retry timer that updates the priority list based on the failure factor at that time, and a second that has a shorter count cycle than the first transmission retry timer And an outgoing retry timer
When the transmission operation fails, if the cause of the failure of the transmission operation is other than the partial restriction, the interval until the retry of the transmission operation is managed by the first timer,
When partial restriction is imposed by the base station, when the second transmission retry timer times out, the transmission operation is retried, and the transmission operation is not successful within the time counted by the second transmission retry timer. The wireless terminal apparatus according to claim 1, wherein an attempt is made to acquire a communication system having the next highest priority. A wireless network system including a plurality of base stations and a mobile terminal device capable of supporting a plurality of communication systems,
The base station
At least one communication system of the plurality of communication systems transmits broadcast information identifying other communication systems in the vicinity,
The portable terminal device
A communication unit capable of selecting one of the plurality of communication systems and wirelessly communicating with a base station;
A storage unit storing a priority list in which a plurality of usable communication systems are defined in order of priority;
A control unit that changes the communication system used by the communication unit and tries a transmission operation, and
The controller is
When a call is made to the waiting base station using the communication system sequentially selected based on the priority list, and each time the call operation fails, the cause of the failure to which each priority is assigned is indicated. A wireless network system, wherein the priority list is stored in a predetermined area of the storage unit in association with the communication system used for the update, and the priority list is updated with reference to the failure factor stored in the storage unit.

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