JP4588617B2 - Wireless communication terminal, wireless communication system, and wireless base station selection method - Google Patents

Description

The present invention mainly relates to a radio communication terminal such as a mobile phone terminal that performs radio communication with a radio base station apparatus, a radio communication system, and a radio base station selection method.
About.

  In a conventional wireless communication terminal such as a mobile phone, when the power is turned on and activated, a capturing process is performed on the wireless base station device, which is a target of a standby process. By the way, as in the radio communication system shown in FIG. 6, a specific radio base station apparatus having a frequency band and channel different from that of the radio base station apparatus BS-A that provides a general communication service. There is a case where it is desired to shift the radio communication terminal 10Z to the BS-Z. Here, the specific radio base station apparatus BS-Z is, for example, a radio base station apparatus for providing an extension telephone service in a premises such as a building.

  When the radio communication terminal 10Z acquires the radio base station apparatus, the radio frequency terminal 10Z uses the same frequency band (BandClass ID = 6) and channel (Channel ID = 225) as the radio base station apparatus that is in the standby process from other frequency bands. The pilot signal is received from another radio base station apparatus with priority and the radio base station apparatus is captured.

  Therefore, when there is another radio base station apparatus that transmits a pilot signal in the same frequency band and channel as the radio base station apparatus BS-A, the radio communication terminal 10Z has a different frequency in the vicinity of the radio communication terminal 10Z. Despite the existence of a radio base station apparatus BS-Z that transmits a pilot signal in a band and a channel, another radio base station apparatus is captured and the transition to the radio base station apparatus BS-Z is ensured. It was known that it was difficult to execute.

Therefore, as shown in FIG. 7, in order to reliably transition the radio communication terminal to the target radio communication terminal, a pilot beacon that transmits a pilot signal in the same frequency band and channel as the transition-source radio base station apparatus BS-A A technique for installing a radio base station apparatus called (Pilot Beacon) is known (see, for example, Patent Document 1). By using this technology, after transitioning from the radio base station apparatus BS-A to the pilot beacon once, the radio communication terminal is forcibly lost from the pilot beacon to transition to the target radio base station apparatus BS-Z. The probability of making it possible can be increased.
JP 2004-297480 A

  However, whether or not the transition from the pilot beacon to the target radio base station apparatus BS-Z depends on the acquisition process by the conventional radio communication terminal 10Z, and whether or not the transition can be surely performed. Had the problem of being unclear.

  The present invention has been made in order to solve the above-described problem, and an object of the present invention is to provide a radio communication terminal and a radio communication system capable of reliably causing a target radio base station apparatus to make a transition while using a pilot beacon. And providing a radio base station selection method.

  In order to solve the above-described problem, the present invention provides a first radio base station apparatus that performs communication based on first frequency information and a second radio base station apparatus that performs communication based on second frequency information. And priority is given to a third radio base station apparatus that transmits a radio signal that is not normal when communication is performed using the first frequency information, and a radio base station apparatus that transmits a radio signal using frequency information during communication. A radio communication terminal including a radio communication terminal to be selected as a standby target, and for each of the radio base station devices, acquisition in a group corresponding to the frequency information, the group information, and the group information In addition to storing priority information, the group information for the first radio base station apparatus stores information indicating a first group, and the second and third radio base station apparatuses In the group information, information indicating a second group is stored, and the acquisition priority information for the second base station device is higher than the acquisition priority information for the third radio base station device. A state in which the third radio base station device is set as a standby target from a state in which the first radio base station device is set as a standby target in communication using the first frequency information. If the abnormal radio signal is received from the third radio base station apparatus in the case of shifting to, the storage means stores the same group information as the third radio base station apparatus that is the transmission source of the radio signal. And a capture processing means for performing capture processing on a radio base station apparatus with a high priority for the capture priority information.

  According to the present invention, in the above-described invention, the acquisition priority information for the second radio base station apparatus includes the information indicating the second group as the group information stored in the radio base station apparatus. It is characterized by being set to the highest priority among them.

  According to the present invention, in the invention described above, the acquisition processing unit performs the acquisition processing based on the same group information and the acquisition priority information as the third radio base station device. Reading means for reading out the frequency information with high priority from the means, and frequency switching means for switching the frequency information to be communicated to the frequency information read by the reading means, the frequency switching means switching the frequency information A radio base station apparatus is captured by communication.

  The present invention provides, in the above-described invention, a first radio base station apparatus that performs communication based on first frequency information, and a second radio base station apparatus that performs communication based on second frequency information; A wireless communication system comprising a wireless communication terminal that preferentially selects a wireless base station device that transmits a wireless signal using frequency information during communication as a standby target, wherein communication is performed using the first frequency information. And a third radio base station apparatus that transmits a radio signal that is not normal when performed, wherein the radio communication terminal includes, for each of the radio base station apparatuses, frequency information, group information, and a group corresponding to the group information. Acquisition priority information, and the group information for the first radio base station apparatus stores information indicating a first group, and the second and third radio base station apparatuses On the other hand, the group information stores information indicating a second group, and the acquisition priority information for the second base station apparatus is higher than the acquisition priority information for the third radio base station apparatus. A state in which the third radio base station device is set as a standby target from a state in which the first radio base station device is set as a standby target in communication using the first frequency information. If the abnormal radio signal is received from the third radio base station apparatus in the case of shifting to, the storage means stores the same group information as the third radio base station apparatus that is the transmission source of the radio signal. The wireless communication system is characterized by comprising acquisition processing means for executing acquisition processing on a radio base station apparatus with a high priority of acquisition priority information.

  The present invention provides, in the above-described invention, a first radio base station apparatus that performs communication based on first frequency information, and a second radio base station apparatus that performs communication based on second frequency information; Priority is given to a third radio base station apparatus that transmits a radio signal that is not normal when communication is performed using the first frequency information, and a radio base station apparatus that transmits a radio signal using frequency information during communication. A radio base station selection method in a radio communication system including a radio communication terminal to be selected as a standby target, wherein the radio communication terminal includes frequency information, group information, and group information for each of the radio base station devices. The storage priority information in the corresponding group is stored in the storage means, and information indicating the first group is stored in the group information for the first radio base station apparatus. The group information for the second and third radio base station devices stores information indicating a second group, and the acquisition priority information for the second base station device is the third radio base station. A step of storing so that the priority is higher than the acquisition priority information for a device, and the wireless communication terminal is set as a standby target for the first wireless base station device in communication with the first frequency information. Transitioning from the state to the state to be the waiting target for the third radio base station device, receiving the abnormal radio signal from the third radio base station device, the radio communication terminal, In the storage means, acquisition processing is performed for a radio base station apparatus having a higher priority in the acquisition priority information in the same group information as the third radio base station apparatus that is the transmission source of the radio signal. The method comprising: a radio base station selection method, which comprises a.

According to the present invention, the radio communication terminal stores frequency information, group information, and acquisition priority information in the group corresponding to the group information for each of the radio base station apparatuses, and the first radio base station The group information for the station apparatus stores information indicating the first group, the group information for the second and third radio base station apparatuses stores information indicating the second group, and the second base station apparatus Storage means for storing so that the acquisition priority information for is higher than the acquisition priority information for the third radio base station apparatus. And
The third radio base station apparatus when a transition is made from the state in which the first radio base station apparatus is a standby object to the state in which the third radio base station apparatus is a standby object in communication using the first frequency information. When an abnormal radio signal is received from the radio base station apparatus having a higher capture priority information in the same group information as the third radio base station apparatus that is the transmission source of the radio signal in the storage means It was set as the structure which performs a capture process. As a result, the wireless communication terminal can be reliably shifted from the first wireless base station device to the target second wireless base station device via the transition to the third wireless base station device. It becomes.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a wireless communication system 1 according to the present embodiment.
The wireless communication system 1 includes a wireless base station device 100A, a wireless base station device 200 called a pilot beacon, a wireless base station device 100Z, and a wireless communication terminal 10. The wireless communication terminal 10 captures any one of the wireless base station devices 100A, 100Z, and 200 as a standby target, and performs communication using a wireless signal with the standby wireless base station device.

  The radio base station apparatus 100A is, for example, a radio base station apparatus belonging to a base station system that provides a public mobile phone communication service (hereinafter, an apparatus that provides the same type of communication service is referred to as a “normal radio base station apparatus”). is there. In the example of FIG. 1, the radio base station apparatus 100A includes a BandClass (frequency band, hereinafter referred to as BC) ID (IDentifier) of 6, a Channel (channel, hereinafter referred to as CH) ID of 255, and a PN code. The ID is 20, the SID (System ID) is 12304, and the NID (Network ID) is 65535.

  Here, the BC ID is an ID given in advance so that a radio base station apparatus (base station system) can identify a frequency band used when transmitting a radio signal. Further, the CH ID is an ID given in advance so that the channel used when the radio base station apparatus (base station system) transmits a radio signal in the frequency band corresponding to the BC ID can be identified. is there. The ID of the PN code is an ID given in advance so that the short-period PN code applied when the radio base station apparatus (base station system) transmits a pilot signal can be uniquely identified. The value is different for each (base station system). The SID is an ID that can uniquely identify the base station system. The NID is an ID given so that each network can be uniquely identified when logically configuring several networks in the base station system. Here, the base station system is a radio communication system configured by one or more radio base station devices. When configured by a plurality of radio base station devices, each base station system is identical to each radio base station device. SID is given. For example, in FIG. 1, the radio base station apparatus 200 and the radio base station apparatus 100Z belong to the same base station system.

  Next, the radio base station apparatus 100Z has a radio base station apparatus (hereinafter referred to as a target radio base station) that preferentially performs standby processing when the radio communication terminal 10 approaches the radio signal transmission range of the radio base station apparatus 100Z. Device). The radio base station apparatus 100Z is, for example, a radio base station apparatus that belongs to a base station system that is installed on the premises and provides an extension telephone service, and therefore generally belongs to a base station system that provides a public communication service. A frequency band different from that of the radio base station device 100A is set. In the example of FIG. 1, the radio base station apparatus 100Z is assigned 3 as the BC ID, 76 as the CH ID, 50 as the PN code ID, 12305 as the SID (System ID), and 1445 as the NID.

  Next, the radio base station apparatus 200, which is a pilot beacon, is used only to transition the radio communication terminal 10 from the radio base station apparatus 100A to the radio base station apparatus 100Z, and does not provide a communication service. It is. In addition, when the radio communication terminal 10 is set as a standby target, the radio base station apparatus 200 transmits an ECCLM (Extended CDMA Channel List Message) (hereinafter referred to as an abnormal ECCLM) including an ID of a nonexistent channel, The wireless communication terminal 10 is brought into a system lost state. Further, when the radio base station apparatus 200 is captured by the radio communication terminal 10, the radio base station apparatus 200 transmits an SCHM (Sync CHannel Message) (hereinafter referred to as an abnormal SCHM) including an ID of a nonexistent channel. To the system lost state. In the example of FIG. 1, the radio base station apparatus 200 is given the same BC ID and CH ID as the normal radio base station apparatus 100A, and the same PN code ID as the target radio base station apparatus 100Z. SID and NID are assigned.

  The information including the BC ID, CH ID, SID, and NID, excluding the PN code ID, is hereinafter referred to as base station information.

FIG. 2 is a block diagram showing the internal configuration of the wireless communication terminal 10.
In the following description, when a device corresponding to any of the above-described radio base station devices 100A, 100Z, and 200 is indicated, it is described as “radio base station device” without a reference sign.

  In the wireless communication terminal 10, the wireless communication unit 11 can receive a wireless signal by sequentially switching several use frequency bands set in advance by an RF (Radio Frequency) circuit provided therein. The radio base station apparatus is captured based on the radio signal.

  Here, “capture” means that the radio communication terminal 10 synchronizes the short-period PN code of its own terminal with the short-period PN code from the radio base station apparatus. Specifically, the radio communication unit 11 sequentially detects the pilot signal transmitted from the radio base station apparatus, and synchronizes the short-period PN code of the own terminal with the detected pilot signal. If successful, capture succeeds. Note that changing the waiting target from the radio base station apparatus of one base station system to the radio base station apparatus of another base station system by this capture is referred to as “transition” in the following description.

  In addition, when performing a standby process with a radio base station apparatus in a certain base station system, the radio communication unit 11 gives priority to a pilot signal transmitted from the same frequency band and channel as the frequency band and channel in the standby process. The PN code is changed to the one with the highest reception strength among the received pilot signals, and handoff to another radio base station apparatus in the same base station system is performed. In this case, the radio communication unit 11 hands off to another radio base station apparatus while maintaining the standby processing state.

  In addition, when the wireless communication unit 11 maintains the standby processing state and performs handoff to another wireless base station device, the wireless communication unit 11 transmits overhead (OVerHead) information including base station information and the like from the wireless base station device of the handoff to the wireless signal. Based on the received overhead information, the setting information of the radio base station apparatus stored therein is updated, that is, the setting information is rewritten. In addition, when performing a handoff to another radio base station apparatus, the radio communication unit 11 performs an overhead information update process only when the overhead information related to the handoff destination radio base station apparatus is not held. In this update process, the wireless communication unit 11 receives overhead information on a channel (paging channel) that is constantly monitored when in the standby state, and also receives a message (ECCLM) received as part of this overhead information. . This message includes information indicating a channel on which standby is to be performed, and the wireless communication unit 11 changes the standby channel according to this information or has a channel specified by the message. For example, the final standby channel is determined by performing further handoff. Note that, when handoff to another radio base station apparatus is not specified in the message (ECCLM), the radio communication unit 11 continues the standby process in the radio base station apparatus.

  In addition, when the radio communication unit 11 switches to a frequency band and channel different from the frequency band and channel in the standby process according to the instruction information from the control unit 20, the wireless communication unit 11 does not maintain the standby process state and The radio base station apparatus corresponding to the base station information included in the instruction information is acquired. Further, when the radio communication unit 11 switches to a different frequency band and channel and acquires the radio base station apparatus, the radio communication unit 11 receives an SCHM (Sync CHannel Message) through a sync channel. Further, when receiving the SCHM, the radio communication unit 11 refers to information on the paging channel included in the SCHM and starts a standby process with the captured radio base station apparatus.

  In addition, when the wireless communication unit 11 receives an abnormal ECCLM from the wireless base station device, the wireless communication unit 11 reacquires the wireless base station device that is the transmission source of the ECCLM. In addition, when the wireless communication unit 11 receives an abnormal SCHM, the wireless communication unit 11 cannot receive a wireless signal through the paging channel. Therefore, the wireless communication unit 11 stores information indicating the system lost state where the communication partner is absent and internal setting information. The base station information of the radio base station apparatus that is the communication partner immediately before being input is input to the control unit 20.

  The control unit 20 has a function of controlling operations between the functional units of the wireless communication terminal 1. In the present embodiment, a PRL management unit 21, a determination unit 22, and an instruction unit 23, which will be described later, are provided. In the control unit 20, when a search request including base station information is input from the determination unit 22, the PRL management unit 21 stores in the storage unit 30 whether there is a record that matches the base station information. A search is performed from a PRL (Preferred Roaming List) 31 and the search result is output to the determination means 22. In addition, when a request for acquiring new base station information is input from the instruction unit 23, the PRL management unit 21 reads base station information with reference to acquisition priority information stored in the PRL 31 and group identification information described later. The read base station information is input to the instruction means 23.

  When the wireless communication unit 11 captures a wireless base station device of another base station system, the determination unit 22 receives base station information of the wireless base station device captured by the wireless communication unit 11 from the wireless communication unit 11. The search request including the input base station information is input to the PRL management unit 21. Further, the determination unit 22 determines whether information matching the base station information input from the wireless communication unit 11 exists in the PRL 31 based on the search response output from the PRL management unit 21.

  When the determination unit 22 determines that information matching the base station information input from the wireless communication unit 11 exists in the PRL 31, the instruction unit 23 transmits information indicating that the wireless base station device is a standby target to the wireless communication Input to the unit 11 to cause the wireless communication unit 11 to perform standby processing. Further, when the determining unit 22 determines that information matching the base station information input from the wireless communication unit 11 exists in the PRL 31, the instructing unit 23 indicates information indicating that the wireless base station device is not a standby target. Is input to the wireless communication unit 11 and the wireless communication unit 11 does not perform standby processing with the wireless base station device, and either captures another wireless base station device or outputs an out-of-service display to the display unit 13. To do. In addition, when the information indicating the system lost state and the base station information are input from the wireless communication unit 11, the instruction unit 23 receives the base station input to the PRL management unit 21 in order to acquire a new wireless base station device. Enter an acquisition request that contains information. In addition, when new base station information is output from the PRL management unit 21, the instruction unit 23 inputs capture instruction information including the output base station information to the wireless communication unit 11.

  The voice input / output unit 12 includes a microphone, a speaker, and a voice processing circuit, and sounds a ring tone when an incoming call is received in accordance with an incoming call notification from the control unit 20. The voice input / output unit 12 also decodes and outputs a voice signal received from another wireless communication terminal input from the control unit 20. Also, the voice input / output unit 12 collects the user's voice, converts it into a voice signal, performs encoding, and outputs the voice signal to the control unit 20.

  The display unit 13 includes, for example, a liquid crystal and a display control circuit, and displays image data and the like input from the control unit 20 on the liquid crystal. The operation unit 14 includes, for example, a keyboard and the like, detects a user's key operation, and inputs information on the detected key to the control unit 20.

  The storage unit 30 is a non-volatile storage area and stores a PRL (Preferred Roaming List) 31. FIG. 3 is a diagram showing a data structure of the PRL 31. The PRL 31 includes “INDEX”, “BC”, “CH”, “SID”, “NID”, “GEO (Geo Location)”, “PRI (Priority). ) ”Item. In “INDEX”, a number is stored for each record so that the stored record can be identified. “BC” stores the frequency band ID of the radio base station apparatus corresponding to the record. In “CH”, the ID of the channel of the radio base station apparatus corresponding to the record is stored. “SID” is given the ID of the base station system to which the radio base station apparatus corresponding to the record belongs. “NID” is assigned an ID of a network that is configured in the base station system by the radio base station apparatus corresponding to the record.

  “GEO” stores group identification information given to each group when the records of the radio base station apparatus are grouped in the PRL 31. Specifically, as shown in FIG. 3, records with “INDEX” from 0 to 63 belong to a certain group (the group identification information of this group is hereinafter referred to as GEO1), and “INDEX” Records from 64 to 83 belong to another group (the group identification information of this group is hereinafter referred to as GEO2). Note that “NEW” stored in “GEO” indicates that it is a new GEO, and FIG. 3 shows that there are two groups because there are two “NEW”, “SAME” indicates that it belongs to the same GEO as the above record.

  “PRI” stores capture priority information indicating the priority order read in one GEO. In FIG. 3, the GEO 1 is set so that records with “INDEX” from 0 to 31 are read preferentially over records with “INDEX” from 32 to 63. Further, in GEO2, it is set so that records with “INDEX” of 64 to 73 are read preferentially over records with “INDEX” of 74 to 83. Note that “SAME” stored in “PRI” indicates the same priority as the lower record, and “MORE” indicates that the priority is higher than the lower record.

  That is, the PRL management means 21 of the control unit 20 can specify and read records belonging to the same GEO by referring to the records in which “INDEX” is 0 in the PRL 31 in order, and further within the same GEO. High priority records can be specified and read.

  FIG. 4 is a diagram showing an outline of an arrangement in the case where the record of the radio base station apparatus is stored in the PRL 31 shown in FIG. As shown in FIG. 4, a normal radio base station apparatus group including the radio base station apparatus 100A arranges records so as to belong to GEO1, a target radio base station apparatus group including the radio base station apparatus 100Z, and a pilot beacon. The records are arranged so that the wireless base station device groups belong to GEO2, which is a different GEO. Further, in GEO2, the records are arranged so that the acquisition priority information of the target radio base station apparatus group has a higher priority than the acquisition priority information of the radio base station apparatus group of the pilot beacon. In FIG. 3, the record of the radio base station apparatus 100A is a record in which “INDEX” is 0, the record of the radio base station apparatus 100Z is a record in which “INDEX” is 64, and is a radio base station that is a pilot beacon. The record of the device 200 corresponds to the record “INDEX” of 74, and is arranged as shown in FIG.

  By arranging the records in this way, the radio communication terminal 10 receives an unscheduled SCHM from the radio base station apparatus 200 after handing off (transferring) from the radio base station apparatus 100A to the radio base station apparatus 200 that is a pilot beacon. In the system lost state, the radio base station reads out a record having the same SID and NID as that of the radio base station apparatus 200 from the PRL 31 in the GEO 2 to which the record of the radio base station apparatus 200 belongs. The record of the device 100Z is read. Then, after switching the frequency band and channel of the wireless communication terminal 10 to the frequency band and channel included in the record, the wireless base station device 100Z is captured, so that it does not depend on the frequency band and channel in communication. It becomes possible to make a transition to a specific radio base station apparatus with certainty.

  Next, referring to FIG. 5, from the state in which radio communication terminal 10 is performing standby processing with radio base station apparatus 100A, handoff is performed to radio base station apparatus 200 that is a pilot beacon. Processing in the wireless communication terminal 10 until the transition to the station device 100Z will be described.

  The vertical axis in FIG. 5 indicates which radio base station apparatus the radio communication terminal 10 is in communication with. From the left, the “no communication partner state”, “radio base station apparatus 100A and communication state”, This indicates that each state is “communication state with radio base station apparatus 200 (pilot beacon)” and “communication state with radio base station apparatus 100Z”.

  First, from a state where the wireless communication unit 11 of the wireless communication terminal 10 is performing standby processing with the wireless base station device 100A (step S1), the wireless communication terminal 10 is carried by the user and the wireless base station that is a pilot beacon The station apparatus 200 moves to the radio signal transmission range. When the reception intensity of the pilot signal transmitted from the radio base station apparatus 200 becomes larger than the reception intensity of the radio signal transmitted from the radio base station apparatus 100A, the radio communication unit 11 of the radio communication terminal 10 Handoff is performed to the radio base station apparatus 200 while maintaining the state (step S2). Then, the radio communication unit 11 of the radio communication terminal 10 reads the overhead information included in the radio signal transmitted from the radio base station apparatus 200, and stores the radio base station apparatus stored therein based on the read overhead information. The setting information is updated (step S3).

  Next, the wireless communication unit 11 of the wireless communication terminal 10 receives an abnormal ECCLM from the wireless base station device 200 (step S4). Since there is no channel corresponding to the channel ID included in the ECCLM, the wireless communication unit 11 enters the system lost state (step S6) as channel switching failure (step S5). The wireless communication unit 11 starts reacquiring the wireless base station device 200 that is the transmission source of the ECCLM when the system is lost due to channel switching failure (step S8).

  When the radio base station apparatus 200 is captured by the radio communication unit 11, the radio base station apparatus 200 transmits an abnormal SCHM (step S9), and the radio communication unit 11 that has received the SCHM has a paging channel (PCH) included in the SCHM. Therefore, if PCH reception fails (step S10), information indicating that the system is in a lost state and the base station information of the radio base station apparatus 200 that is the previous communication partner stored in the setting information are controlled. Input to the instruction means 23 of the unit 20 (step S11). When the information indicating the system lost state and the base station information are input from the wireless communication unit 11, the instruction unit 23 inputs an acquisition request including the base station information to the PRL management unit 21. The PRL management unit 21 searches the PRL 31 for a record including the base station information included in the acquisition request, and refers to “GEO” included in the searched record. Next, a record that belongs to the same GEO as the “GEO” and matches the SID and NID included in the input base station information is read according to “PRI” of the PRL 31. Here, a record corresponding to the radio base station apparatus 100Z is read. Then, the PRL management unit 21 reads the BC ID, CH ID, SID, and NID information corresponding to the base station information from the read record, and outputs the information to the instruction unit 23 (step S12).

  The instructing unit 23 inputs capture instruction information including BC ID, CH ID, SID, and NID information output from the PRL management unit 21 to the wireless communication unit 11. The radio communication unit 11 switches the frequency band and channel according to the BC ID and CH ID included in the input acquisition instruction information (step S13), and performs pilot signal transmission in the frequency band and channel for re-acquisition processing. Wait (step S14). Then, the radio communication unit 11 starts acquisition by synchronizing the short-period PN code with the pilot signal (step S15), and is included in the SID and acquisition instruction information included in the SCHM transmitted from the synchronized radio base station apparatus. Until the SID matches, a process of repeatedly capturing the radio base station apparatus is performed. Then, a standby process is started with the radio base station apparatus 100Z captured in the repeated process (step S16).

  With the configuration of the above embodiment, when the radio communication terminal 10 performs a transition via the radio base station apparatus 200 that is a pilot beacon, the abnormal normal ECCLM and the abnormal SCLM transmitted from the radio base station apparatus 200 are displayed. When receiving, by searching for a radio base station apparatus having a higher priority from the PRL 31 in the same GEO2 as the radio base station apparatus 200, the radio base station apparatus 100Z that is the final transition destination is searched. Capturing processing can be performed. As a result, the radio communication terminal 10 can be reliably changed to the final destination radio base station apparatus.

  In the above embodiment, when the radio communication terminal 10 is changed only to the radio base station apparatus 100Z, the record of the radio base station apparatus 100Z is stored at the top of the GEO2 of the PRL 31, and the PRL management unit 21 stores the record. Only the upper record may be searched. At this time, the capture priority information described in the present invention corresponds to the record arrangement order in the PRL 31.

  The frequency information described in the present invention corresponds to BC and CH. The first radio base station apparatus according to the present invention corresponds to the radio base station apparatus 100A, the second radio base station apparatus corresponds to the radio base station apparatus 100Z, and the third radio base station apparatus. Corresponds to the radio base station apparatus 200 which is a pilot beacon. The storage unit described in the present invention corresponds to the storage unit 30 that stores the PRL 31. Further, the acquisition processing means described in the present invention is stored in the PRL 31 when a part for performing acquisition processing related to the wireless communication unit 11 and a new base station information acquisition request related to the PRL management means 21 are input. This corresponds to a part for performing processing for reading base station information with reference to acquisition priority information and the like and a part for inputting acquisition instruction information related to the instruction means 23 to the wireless communication unit 11. The reading unit described in the present invention corresponds to the PRL management unit 21, and the frequency switching unit corresponds to a configuration for switching the frequency of the instruction unit 23 and the wireless communication unit 11.

  The above-described wireless communication terminal 10 has a computer system inside. The processing performed by the PRL management unit 21, the determination unit 22, and the instruction unit 23 described above is stored in a computer-readable recording medium in the form of a program, and the computer reads and executes this program. The above processing is performed. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

It is a block diagram which shows the radio | wireless communications system which concerns on this embodiment. It is a block diagram which shows the internal structure of the radio | wireless communication terminal which concerns on the same embodiment. It is the figure which showed the data structure of PRL which concerns on the same embodiment. It is a figure for demonstrating arrangement | positioning of the record of PRL which concerns on the embodiment. It is a figure for demonstrating operation | movement of the radio | wireless communication terminal which concerns on the embodiment. It is the block diagram (the 1) of the conventional radio | wireless communications system. It is a block diagram (the 2) of the conventional radio | wireless communications system.

Explanation of symbols

10 radio communication terminal 100A radio base station apparatus 100Z radio base station apparatus 200 radio base station apparatus (pilot beacon)

Claims (5)

Communication with the first radio base station apparatus that performs communication based on the first frequency information, the second radio base station apparatus that performs communication based on the second frequency information, and the first frequency information A third radio base station apparatus that transmits a radio signal that is not normal when performed, and a radio communication terminal that preferentially selects a radio base station apparatus that transmits a radio signal based on frequency information during communication as a standby target A wireless communication terminal in a wireless communication system,
For each of the radio base station apparatuses, frequency information, group information, and acquisition priority information within the group corresponding to the group information are stored, and the group information for the first radio base station apparatus includes Information indicating one group is stored, information indicating a second group is stored in the group information for the second and third radio base station apparatuses, and the acquisition priority for the second base station apparatus is stored Storage means for storing information so that the priority is higher than the acquisition priority information for the third radio base station device;
When the communication with the first frequency information shifts from the state in which the first radio base station device is a standby target to the state in which the third radio base station device is a standby target, the third radio base station device When the radio signal is received from the radio base station device, the priority of the acquisition priority information is the highest in the same group information as the third radio base station device that is the transmission source of the radio signal in the storage means Acquisition processing means for executing acquisition processing for the radio base station apparatus;
A wireless communication terminal comprising: The acquisition priority information for the second radio base station apparatus is set to the highest priority among the radio base station apparatuses in which information indicating the second group is stored as the group information. The wireless communication terminal according to claim 1. The capture processing means includes
When performing the acquisition process, based on the same group information and the acquisition priority information as the third radio base station apparatus, a reading unit that reads out the frequency information with high priority from the storage unit;
Frequency switching means for switching the frequency information to be communicated to the frequency information read by the reading means,
The radio communication terminal according to claim 1 or 2, wherein the radio base station apparatus is captured by communication of the frequency information switched by the frequency switching means. A first radio base station apparatus that performs communication based on the first frequency information, a second radio base station apparatus that performs communication based on the second frequency information, and a radio signal based on the frequency information during communication A wireless communication system comprising a wireless communication terminal that preferentially selects a wireless base station device to transmit as a standby target,
A third radio base station device that transmits a radio signal that is not normal when communication is performed using the first frequency information;
The wireless communication terminal is
For each of the radio base station apparatuses, frequency information, group information, and acquisition priority information within the group corresponding to the group information are stored, and the group information for the first radio base station apparatus includes Information indicating one group is stored, information indicating a second group is stored in the group information for the second and third radio base station apparatuses, and the acquisition priority for the second base station apparatus is stored Storage means for storing information so that the priority is higher than the acquisition priority information for the third radio base station device;
When the communication with the first frequency information shifts from the state in which the first radio base station device is a standby target to the state in which the third radio base station device is a standby target, the third radio base station device When the radio signal is received from the radio base station device, the priority of the acquisition priority information is the highest in the same group information as the third radio base station device that is the transmission source of the radio signal in the storage means Acquisition processing means for executing acquisition processing for the radio base station apparatus;
A wireless communication system comprising: Communication with the first radio base station apparatus that performs communication based on the first frequency information, the second radio base station apparatus that performs communication based on the second frequency information, and the first frequency information A third radio base station apparatus that transmits a radio signal that is not normal when performed, and a radio communication terminal that preferentially selects a radio base station apparatus that transmits a radio signal based on frequency information during communication as a standby target A wireless base station selection method in a wireless communication system comprising:
For each of the radio base station devices, the radio communication terminal stores frequency information, group information, and capture priority information in a group corresponding to the group information in a storage unit, and the first radio base station The group information for the station apparatus stores information indicating a first group, the group information for the second and third radio base station apparatuses stores information indicating a second group, and the second information Storing the acquisition priority information for the base station apparatus to be higher than the acquisition priority information for the third radio base station apparatus;
The wireless communication terminal makes a transition from a state in which the first wireless base station device is a standby target to a state in which the third wireless base station device is a standby target in communication using the first frequency information. When,
Receiving the abnormal radio signal from the third radio base station apparatus;
For the radio base station apparatus with the higher priority of acquisition priority information in the same group information as the third radio base station apparatus that is the transmission source of the radio signal in the storage means Performing a capture process;
A radio base station selection method comprising:

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