JP6190706B2 - Private wireless system - Google Patents

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JP6190706B2
JP6190706B2 JP2013246941A JP2013246941A JP6190706B2 JP 6190706 B2 JP6190706 B2 JP 6190706B2 JP 2013246941 A JP2013246941 A JP 2013246941A JP 2013246941 A JP2013246941 A JP 2013246941A JP 6190706 B2 JP6190706 B2 JP 6190706B2
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gps
assist data
assist
terminal
server
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JP2015106772A (en
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敏 中江
敏 中江
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株式会社日立国際八木ソリューションズ
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Description

  The present invention relates to a private wireless system using, for example, a personal handy phone system (hereinafter referred to as PHS).

  In recent years, positioning using GPS has been widely used for positioning of mobile stations in wireless systems such as mobile phones. In order for the GPS receiver to determine the position of its own station, it is necessary to receive GPS signals from GPS satellites and to receive satellite orbit information (almanac and ephemeris) to know the position of the received GPS satellites. is there. Obtaining satellite orbit information from GPS satellites takes minutes, so this data is distributed as GPS assist data from an assist server built on a network such as the Internet to a GPS receiver. There has been proposed a technique that enables high-speed position measurement even when the position is bad (see, for example, Patent Document 1).

  In addition, as one of the quick location measurement of indoor wireless systems such as indoors, the location coverage of each wireless terminal device is registered using IMES (Indoor Messaging System) transmitter, so that the area coverage rate and the position detection accuracy can be improved. A technique for improving the technique has been proposed (see, for example, Patent Document 2).

JP 2013-101085 A JP 2012-70082 A

  However, in order to obtain conventional GPS assist data, it is necessary to connect a mobile phone that requires assist data to a public line such as the Internet and receive it. And there was a problem that it would cost a line connection.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a local wireless system that enables quick and accurate position measurement without connecting to a public line such as the Internet.

In order to achieve the above object, a first aspect of a local radio system according to the present invention includes a plurality of radio base stations having a unique system ID and a plurality of radio base stations connectable to at least one of the plurality of radio base stations. A wireless radio system including at least one wireless terminal, wherein the system is at least one of the plurality of wireless terminals, acquires GPS assist data from a GPS satellite, and is different from a system ID used by another wireless terminal A GPS reference terminal that occupies a predetermined wireless base station using an ID and transmits it to an assist server connected to the local wireless system, and a wireless terminal other than the GPS reference terminal, the GPS satellite A GPS receiving terminal capable of receiving GPS signals from the GPS receiving terminal, and the assist system that distributes the GPS assist data received from the GPS reference terminal in accordance with a GPS assist data distribution request from the GPS receiving terminal. It is intended to and a server.
According to the first aspect, it is possible to reliably acquire indoor position information where it is difficult to grasp the position information. It is also effective for quick positioning calculations. By providing a dedicated GPS reference terminal, reliable communication with the assist server is possible.

In a second aspect of the private wireless system according to the present invention, the GPS reference terminal acquires the GPS assist data from the GPS satellite and transmits it to the assist server at startup and / or periodically.
According to the second aspect, for example, the latest assist data can be always stored in the assist server by acquiring GPS assist data at intervals of 30 minutes and transmitting the GPS assist data to the assist server.

  According to a third aspect of the private wireless system according to the present invention, the GPS receiving terminal transmits a GPS assist data distribution request to the assist server when the GPS out-of-range state continues for a predetermined time.

  According to the third aspect, when the GPS receiver terminal is in the out-of-service state of the GPS satellite, for example, for 2 hours (15 minutes × 8 times monitoring), the assist data delivery request is transmitted to the assist server, and the latest By obtaining the assist data, accurate position measurement can be performed.

According to a fourth aspect of the on-site wireless system according to the present invention, the GPS reference terminal confirms that the GPS assist data is within the GPS range when acquiring the GPS assist data from the GPS satellite. If the acquisition is completed, and the GPS assist data is within the GPS range, the GPS assist data acquired from the GPS satellite is stored in the GPS assist data notification area to be transmitted to the assist server, and the GPS assist data acquisition is completed.
According to the fourth aspect, even when the GPS reference terminal is in a GPS out-of-range state, it is possible to reliably notify the assist server of the assist data by using the previously acquired GPS assist data.

According to a fifth aspect of the on-site wireless system according to the present invention, the GPS receiving terminal transmits the GPS assist data distribution request to the assist server with a location registration completion as a trigger, and receives the GPS assist data when the GPS assist data is received. It writes in the GPS module in the GPS receiving terminal, periodically performs GPS out-of-range / in-range monitoring, and transmits the GPS assist data distribution request when the out-of-range state continues for a certain period of time.
According to the fifth aspect, the GPS receiving terminal can quickly acquire GPS assist data and perform accurate positioning when starting up or when the out-of-service state continues for a certain period of time.

In a sixth aspect of the private wireless system according to the present invention, the system ID of the wireless base station to which the GPS reference terminal and the GPS reference terminal are connected is the same, and is different from the system ID used by other wireless terminals. It is.
According to the sixth aspect, the radio base station for the GPS reference terminal cannot be used by other radio terminals, and the GPS reference terminal reliably transmits the assist data by providing the dedicated GPS reference terminal.

In a seventh aspect of the private wireless system according to the present invention, the GPS assist data is written in the GPS module of the GPS receiving terminal and used for positioning.
According to the seventh aspect, the GPS assist data is overwritten and always used for positioning, so that accurate position measurement can be performed quickly and in good or bad radio wave conditions.

In an eighth aspect of the private wireless system according to the present invention, the GPS reference terminal and the GPS receiving terminal are PHS.
According to the eighth aspect, since the GPS assist data can be distributed to the wireless terminal using the local wireless system without using the public line such as the Internet, the line facility cost when using the public line And line connection costs are not required.

According to a ninth aspect of the local radio system of the present invention, no radio base station dedicated to the GPS reference terminal is provided, and all use the same system ID.
According to the ninth aspect, the radio channel of the radio base station can be used effectively.

The tenth aspect of the on-site wireless system according to the present invention also allows a plurality of GPS reference terminals to be installed. If any one GPS reference terminal can acquire GPS assist data, the information is accumulated for a certain period of time. Other GPS assist data acquired within is to be discarded.
According to the tenth aspect, assist data is surely acquired even when a GPS reference terminal cannot always acquire radio waves of a GPS satellite in a good state due to restrictions on the installation location of the GPS reference terminal. It becomes possible.

  According to the private wireless system according to the present invention, it is possible to perform quick and accurate position measurement without connecting to a public line such as the Internet.

1 is an overall configuration diagram of a local radio system according to an embodiment of the present invention. The block diagram which shows the function structure of a GPS reference | standard terminal. The block diagram which shows the function structure of a GPS receiving terminal. The block diagram which shows the function structure of an assist server. The figure which shows the flow of assist data and position information. The sequence diagram which shows the outline | summary of the acquisition / delivery process of assist data. The sequence diagram which shows the outline | summary of the acquisition / delivery process of assist data. The figure which shows the assist data acquisition sequence of a GPS reference | standard terminal. The figure which shows the assist data acquisition sequence of a GPS reference | standard terminal. The figure which shows the assist data notification sequence of a GPS reference | standard terminal. The figure which shows the assist data notification sequence of a GPS reference | standard terminal. The figure which shows the assist data notification sequence of a GPS reference | standard terminal. The figure which shows the assist data notification sequence of a GPS reference | standard terminal. The figure which shows the GPS assist data delivery request | requirement transmission sequence of a GPS receiving terminal. The figure which shows the GPS assist data delivery request | requirement transmission sequence of a GPS receiving terminal. The figure which shows the GPS assist data delivery request | requirement transmission sequence of a GPS receiving terminal. The figure which shows the GPS assist data delivery request | requirement transmission sequence of a GPS receiving terminal. The figure which shows the GPS assist data delivery request | requirement transmission sequence of a GPS receiving terminal. The figure which shows the GPS assist data delivery request | requirement transmission sequence of a GPS receiving terminal. The figure which shows the GPS assist data write-in sequence of a GPS receiving terminal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall configuration diagram of a private wireless system according to an embodiment of the present invention.
As shown in FIG. 1, this on-site wireless system includes a GPS reference terminal 10, a GPS receiving terminal 11, a wireless base station 2, a control device (CS) 3, an assist server 41, a position display server 42, and a position display client 5. Have. The assist server 41 and the position display server 42 may be incorporated in one server as each application, or may be separate servers. This system is a private telephone system using, for example, a PHS (Personal Handy Phone System), and the GPS reference terminal 10 and the GPS receiving terminal 11 are configured by PHS terminals. In addition to individual calls, the GPS receiving terminal 11 includes group calls such as convocation-type conference calls, participation-type conference calls, and simultaneous notifications, emergency call functions such as emergency alerts and fall alarms, and data communication functions.

  The GPS reference terminal 10 is always supplied with power (AC100V), and is safely housed in a BS (Base Station) case installed in a place where the reception state of radio waves from GPS satellites is relatively good. As shown in FIG. 2A, the GPS reference terminal 10 includes a GPS module 101, an assist data notification area 102, an assist data notification unit 103, a timer 104, and a radio module 105. Information (assist data) is periodically received and notified to the assist server 41 via the radio base station 2 and the control device 3. It is possible to install a plurality of GPS reference terminals 10 when the GPS reference terminal 10 cannot always receive the radio waves of the GPS satellites in a good condition due to restrictions on the installation location of the GPS reference terminal 10. .

  As shown in FIG. 2B, the GPS receiving terminal 11 includes a GPS module 111, an assist data reception area 112, an assist data distribution request unit 113, a timer 114, and a wireless module 115. A position measurement unit 1111 and a storage unit 1112 are included. The GPS receiving terminal 11 transmits an assist data distribution request to the assist server 41 in addition to the various call functions of the on-premises call system described above, acquires assist data, and stores it in the storage unit 1112 of the GPS module. The GPS receiving terminal 11 measures the position of the own station based on the stored assist data and the GPS signal received from the GPS satellite, and notifies the position display client 5 via the position display server 42.

  The radio base station 2 is a radio communication base station to which the GPS reference terminal 10 and the GPS receiving terminal are connected. The wireless base station 2 is given a unique system ID in advance, and by separating the system ID of the GPS reference terminal 10 from other GPS receiving terminals 11, the predetermined wireless base station 2 can be used exclusively to assist data. Can be reliably notified to the assist server 41.

  The control device 3 is connected to each radio base station 2 through a signal line, and controls the local radio system. Furthermore, the control device 3 is connected to the assist server 41 via a LAN, and enables communication between the GPS reference terminal 10 and the GPS receiving terminal and the assist server 41.

  As shown in FIG. 2C, the assist server 41 includes a network I / F 401, an assist data storage unit 402, an assist data storage area 403, and an assist data distribution unit 404, and is notified from the GPS reference terminal 10. The assist data is accumulated in the assist data storage area 403. The assist server 41 receives an assist data distribution request from the GPS receiving terminal 11 and provides assist data to the requesting GPS receiving terminal 11. Further, the position display server 42 distributes the position information received from the GPS receiving terminal 11 to the position display client 5.

  The position display client 5 receives the position information sent from the position display server 42 and displays the position of each terminal on the map on the screen based on the position information.

FIG. 3 shows the flow of assist data and position information.
The GPS reference terminal 10 receives satellite orbit information from GPS satellites and periodically transmits it to the assist server 41 as assist data (step S1).
The assist server 41 distributes the assist data received from the GPS reference terminal 10 to the GPS receiving terminal 11 (step S2).

The GPS receiving terminal 11 writes assist data in the storage unit of the GPS module. Even when the GPS receiving terminal 11 exists in a place where the GPS radio wave condition is poor, the GPS module can quickly and accurately determine the position by using the assist data (step S3).
The position information measured by the GPS receiving terminal 11 is transmitted to the position display server 42, and the position display client 5 displays the position of each GPS receiving terminal 11 on the map according to the position information received from the position display server 42 (step). S4).

Next, the operation of this private wireless system will be described in detail.
[Overview of assist data acquisition / distribution processing]
4A and 4B are sequence diagrams illustrating an outline of assist data acquisition / distribution processing according to the private wireless system.

  The GPS reference terminal 10 notifies assist data to the assist server 41 at the time of activation or periodically (for example, at intervals of 30 minutes) (step S101). The assist server 41 stores the assist data notified from the GPS reference terminal 10 in an empty storage table, and transmits an assist data notification response to the GPS reference terminal 10 (step S102). Upon receiving the assist data notification response, the GPS reference terminal 10 starts an assist data notification timer in order to perform regular transmission every 30 minutes.

  For example, the storage table is MAX5194 bytes, and the assist data is received at 30-minute intervals, so it can be said that 8 planes are sufficient for calculation. The storage table is divided into n (n is a natural number) blocks (planes) with a block division size determined in advance by the assist server 41. If the storage table is full (or being distributed), it is discarded without being overwritten. In particular, in an operation in which a plurality of GPS reference terminals 10 are installed, a plurality of assist data may be received almost simultaneously, but the received data is discarded if it is within 30 minutes. Here, the assist data in the assist data storage tables 1 and 2 is being distributed, and the assist server 41 continues to distribute the old data even if new assist data is received from the GPS reference terminal 10. When there is no GPS receiving terminal 11 being distributed and the assist data is newly stored in another storage table, the storage table is released.

  The GPS receiving terminal 11 transmits an assist data distribution request to the assist server 41 at the time of activation, and activates an assist data setting request monitoring timer. Upon receiving the assist data distribution request at the time of activation, the assist server 41 distributes all the blocks of the storage table with the latest assist data (assist data storage table 3 in FIG. 4A) to the requesting GPS receiving terminal 11 in a batch. (Step S103). As shown in FIG. 4A, an assist data setting request (block (plane) 1 divided message 1) to an assist data setting request (block (plane) n divided message n) are distributed. In the assist data setting request, the received block, divided message location, and the like are set.

  When the GPS receiving terminal 11 has received all the assist data, it writes it in the storage unit of the GPS module (step S104).

  As shown in FIG. 4B, when the GPS out-of-range state is detected 8 times continuously at 15-minute intervals, an assist data distribution request is transmitted to the assist server 41, and an assist data setting request monitoring timer is started. The assist server 41 receives the assist data distribution request at the time of regular distribution, compresses the data in the storage table with the latest assist data (assist data storage table 3 in FIG. 4A), and sends it to the requesting GPS receiving terminal 11. The distribution is divided for each block (plane) (step S104).

  When the reception of all assist data is completed, the GPS receiving terminal 11 decompresses the compressed data and writes it in the storage unit of the GPS module (step S105).

[Assist data acquisition processing by GPS standard terminal]
5A and 5B are diagrams illustrating an assist data acquisition sequence of the GPS reference terminal 10. The flow of assist data acquisition between tasks of the GPS reference terminal 10 is described.

  In the MMI task, when an assist data notification timer (30-minute interval) times out (step S201), a GPS assist data acquisition request is transmitted (step S202). Using this acquisition request as a trigger, a GPS task is generated. It is assumed that the existing process (NAV-SOL transmission / reception) has already been checked to see if information can be acquired from the GPS module.

  In the GPS task, first, a GPS initial auxiliary data acquisition request is transmitted to the GPS module, and auxiliary position, time, frequency, and clock drift are acquired as initial auxiliary data (step S203). Response monitoring and retransmission are performed for each acquisition request, and an assist data acquisition response waiting timer is started. In addition, it is confirmed by NAV-SOL transmission / reception that it is within the GPS range. If it is out of range, the acquisition is stopped and “GPS assist data acquisition completion (NG)” is returned (step S204). The range is when the received NAV-SOL values are 0x02 (2D-Fix), 0x03 (3D-Fix), and 0x04 (GPS + dead rocking combined).

  After acquiring the initial auxiliary data, GPS auxiliary ephemeris data (ADI-EPH (1) to ADI-EPH (32)) for 32 satellites is acquired (step S204), and GPS health, UTC, and ionosphere parameters are acquired. Then, GPS auxiliary almanac data for 32 satellites is acquired (step S206). The received assist data is stored in the assist data notification area in the global area and used when transmitted to the assist server 41. The GPS task terminates after transmitting GPS assist data acquisition completion (step S207).

  Thereafter, a GPS assist data notification operation to the assist server 41 is performed (step S208). In the MMI task, the assist data notification timer is restarted (every 30 minutes) (step S209).

[Assist data notification process by GPS standard terminal]
6A to 6D are diagrams showing an assist data notification sequence of the GPS reference terminal 10. The sequence between tasks of the GPS reference terminal 10 when transmitting assist data to the assist server 41 is described.

  As shown in FIG. 6A, first, in the MMI task, a GPS assist data acquisition request is made to the GPS module triggered by the completion of location registration from the layer 3CC call processing. The assist data received from the GPS satellite is stored in the assist data notification area in the global area and used when transmitted to the assist server 41.

  After obtaining the assist data, a call-in-progress display is performed, and a call request for sending the GPS assist data notification is transmitted to the layer 3CC call processing. The operation section is displayed during GPS data acquisition / acquisition (ON). The layer 3CC call processing receives the call request and transmits a DL setting request (batch call) to the channel management. When the channel management transmits a link channel establishment request to the radio base station 2 and receives a link channel assignment notification from the radio base station 2, it transmits m_cchcls to the radio driver and performs the same call processing as a normal preset call. Done. In addition, the channel management transmits an option notification to the layer 3CC call processing, and sets A1 LCH allocation waiting timeout and A2 LCH allocation rejection, A3 TCH interference detection, and TCH open timeout. In LAPDC, set the A5 UA wait timeout.

  In FIG. 6B, when channel management receives a UA (FA) from the radio base station 2, it transmits a DL-setting confirmation (FA) to the layer 3CC call processing via the layer 3RT radio management. Further, when the channel management receives the UA (SA) from the radio base station 2, it transmits a DL-setting confirmation (SA) to the layer 3CC call processing via the layer 3RT radio management. The layer 3CC call process receives jc_m0126, transmits C-SETUP (FA, I) UUI information (UUI call) to channel management, and sets an A7 CALL-PROC waiting timeout. In channel management, C-SETUP (FA, I) is transmitted to the radio base station 2, and when C-CALL-PROC (FA, I) is received from the radio base station 2, it is transmitted to the layer 3 CC call processing.

  Next, when an RT execution request is made from layer 3CC call processing to layer 3 RT radio management, an A13 definition information response timeout and an A13 RT performance request timeout are set, and a mismatch in the collation results of all A13 information elements is detected. When RT execution completion is received from layer 3RT radio management, layer 3CC call processing sends an MM execution request to layer 3MM location management, and A16 MM performance request response timeout and A16 approval request wait timeout are set in layer 3MM location management Then, the same calling process as the normal preset calling is performed. When the MM execution completion is notified from the layer 3MM location management, the layer 3CC call processing detects A17 SA unconnected.

  In FIG. 6C, when layer 3 CC call processing receives DL release indication (FA) from channel management and C-ALERT (SA, I) from LAPDC, C-CONNECT (SA, I from radio base station 2 is received. ) Is received via LAPDC, the start of the call is notified to the MMI task, and the tone type (tone OFF) is set. In the layer 3CC call processing, C-CONN-ACK (SA, I) is returned to the radio base station 2 via the LAPDC, and the call is in progress.

  In the MMI task, a UUI transmission request for assist data notification is transmitted to the layer 3 CC call processing, and an assist data notification response monitoring timer (5 seconds) is set. The assist data stored by the GPS task is extracted by the MMI task, and is divided and transmitted to the assist server 41. In the layer 3CC call processing, C-INFO UUI information (assist data notification) is transmitted to the radio base station 2 via the LAPDC, and is notified from the radio base station 2 to the assist server 41. The assist server 41 accumulates GPS assist data from the radio base station 2 and transmits the C-INFO UUI information attached (assist data notification response) to the layer 3 CC call process via the radio base station 2 and the LAPDC. The layer 3CC call processing notifies the UMI data transmission completion (OK / NG) to the MMI task. The assist data notification process is repeated for the number of data.

  In FIG. 6D, when the assist data notification processing is completed, the standby display is displayed, and the MMI task notifies ON / HOOK to the layer 3CC call processing, and starts the assist data notification timer (at intervals of 30 minutes). Layer 3CC call processing receives ON-HOOK, sends DISC to LAPDC, and displays GPS data acquisition / acquisition display (OFF). Thereafter, the same processing as the cutting sequence is performed. The second and subsequent assist data transmissions are triggered by the time-up of the assist data notification timer.

[Assist data distribution request processing by GPS receiving terminal]
7A to 7F are diagrams showing a GPS assist data distribution request transmission sequence of the GPS receiving terminal 11. FIG. The sequence between tasks of the GPS receiving terminal 11 when an assist data distribution request is transmitted to the assist server 41 is described.

  In FIG. 7A, at the time of start-up, assist data is acquired with the location registration completion from the layer 3CC call processing as a trigger. When the position registration completion (OK) is received, the MMI task is displayed during transmission and is displayed during GPS data acquisition / acquisition (ON). When the layer 3CC call processing receives a call request for sending a GPS assist data delivery request from the MMI task, it transmits a DL setting request (batch call) to the channel management. In channel management, when a link channel establishment request is transmitted to the radio base station 2 and a link channel assignment is received from the radio base station 2, m_cchcls is transmitted to the radio driver, and the same call processing as a normal preset call is performed. Is called. Also, the channel management notifies the layer 3CC call processing of options and sets A1 LCH allocation waiting timeout and A2 LCH allocation rejection, A3 TCH interference detection and TCH open timeout. In LAPDC, set the A5 UA wait timeout. Set A2 LCH allocation rejection, A3 TCH interference detection and TCH open timeout. In LAPDC, set the A5 UA wait timeout.

  In FIG. 7B, when the channel management receives the UA (FA) from the radio base station 2, it transmits a DL-setting confirmation (FA) to the layer 3CC call processing via the layer 3RT radio management. Further, when the channel management receives the UA (SA) from the radio base station 2, it transmits a DL-setting confirmation (SA) to the layer 3 CC call processing via the layer 3 RT radio management. In the layer 3CC call processing, C-SETUP (FA, I) UUI information (UUI call) is transmitted to channel management, and an A7 CALL-PROC waiting timeout is set. In channel management, C-SETUP (FA, I) is transmitted to the radio base station 2, and when C-CALL-PROC (FA, I) is received from the radio base station 2, it is transmitted to the layer 3 CC call processing.

  Next, when an RT execution request is made from layer 3CC call processing to layer 3 RT radio management, an A13 definition information response timeout and an A13 RT performance request timeout are set, and a mismatch in the collation results of all A13 information elements is detected. When RT execution completion is received from layer 3RT radio management, layer 3CC call processing sends an MM execution request to layer 3MM location management, and A16 MM performance request response timeout and A16 approval request wait timeout are set in layer 3MM location management Then, the same calling process as the normal preset calling is performed.

  In FIG. 7C, when the completion of MM execution is notified from the layer 3MM location management, the layer 3CC call processing detects A17 SA unconnected. When layer 3CC call processing receives DL release indication (FA) from channel management and C-ALERT (SA, I) is received from LAPDC, C-CONNECT (SA, I) from radio base station 2 is transferred to LAPDC. Is sent to the MMI task and the start of the call is notified, and the tone type (tone OFF) is set. In the layer 3CC call processing, C-CONN-ACK (SA, I) is returned to the radio base station 2 via the LAPDC, and the call is in progress.

  If wireless connection is possible, an assist data distribution request is transmitted to the assist server 41. That is, the MMI task transmits an assist data distribution request to the layer 3CC call processing and sets an assist data setting request monitoring timer. The layer 3CC call processing receives an assist data distribution request, transmits C-INFO UUI information (assist data distribution request) to the radio base station 2 via the LAPDC, and transmits it from the radio base station 2 to the assist server 41. . The assist server 41 distributes the GPS assist data acquired from the GPS reference terminal according to the assist data distribution request. C-INFO UUI information (assist data setting request) is transmitted to the layer 3 CC call process via the radio base station 2 and the LAPDC. The layer 3CC call processing notifies the UMI data reception request (assist data setting request) to the MMI task.

  In FIG. 7D, the received assist data is stored in the assist data receiving area in the global area and used when the GPS task writes to the GPS module. When the assist data writing process is completed, the standby display appears, and the MMI task notifies the layer 3CC call process of ON-HOOK, and the GPS data acquisition / acquisition display (OFF) is displayed. In the layer 3CC call processing, MM execution stop is transmitted to the layer 3MM location management, the call is released to the MMI task, and an RT disconnection request (forced) is transmitted to the layer 3RT radio management.

  When all the assist data is received, the MMI task transmits a GPS assist data write request to the GPS task, and writes the GPS assist data stored in the assist data receiving area in the global area to the GPS module. A GPS assist data write response from the GPS module is sent from the GPS task to the MMI task.

As shown in FIG. 7E, thereafter, GPS out-of-range / in-range monitoring is periodically performed, and if the GPS out-of-range state continues for a certain time or more, a GPS assist data distribution request is transmitted.
Here, it is assumed that the assist data regular distribution request timer 15 minutes × 8 is set, and the GPS assist data distribution request is transmitted when the GPS out-of-range state is detected eight times continuously at intervals of 15 minutes.

  When the completion of RT disconnection is notified from the layer 3RT radio management to the layer 3CC call processing, the MMI task sends a GPS out-of-range status confirmation to the GPS module via the GPS task, and sets a GPS in-range / out-of-range response waiting timer. When the GPS out-of-range confirmation response (first time) is transmitted from the GPS module to the MMI task via the GPS task, the same is repeated until the out-of-range confirmation response (8th time) is received.

  Then, as shown in FIG. 7F, when the out of service area is detected eight times in succession, the next new assist data is acquired. As described above, the MMI task displays the GPS data being acquired and is being acquired (ON), and transmits a call request for sending a GPS assist data distribution request to the layer 3 CC call process. In response to this call request, a DL setting request (batch call) is transmitted from the layer 3 CC call processing to the channel management, and the channel management transmits a link channel establishment request to the radio base station 2. Hereinafter, the wireless connection sequence, the GPS assist data distribution request sequence, and the GPS assist data write sequence are the same processes as described above.

[Assist data writing process by GPS receiving terminal]
FIG. 8 is a diagram showing a GPS assist data writing sequence of the GPS receiving terminal 11. The sequence in which the GPS receiving terminal 11 writes assist data acquired from the assist server 41 to the GPS module is described.

  As shown in FIG. 8, after the GPS assist data acquisition operation, a GPS assist data write request is transmitted from the MMI task to the GPS task, and a normal mode request is transmitted to the GPS module. The GPS task retrieves the assist data stored in the area for receiving assist data in the global area, and the data for 32 satellites from the GPS auxiliary ephemeris input ADI-EPH (1) to the GPS auxiliary ephemeris input ADI-EPH (32). Write to the GPS module. When the writing is completed, the GPS task sends a backup mode request to the GPS module, and sends a GPS assist data write response to the MMI task.

  After that, the MMI task sends a position information acquisition start to the GPS module via the GPS task. When receiving the position information acquisition start, the GPS module performs position measurement of itself using the written GPS assist data, and returns position information. The GPS task transmits the position information acquisition completion to the MMI task, and transmits the acquired position information to the position display server 42.

  As described above, in the above embodiment, the PHS (GPS reference terminal) is connected to a public line such as the Internet by implementing the GPS assist data acquisition function and the GPS assist data notification function to the assist server. In addition, it is possible to provide GPS assist data to each PHS (GPS receiving terminal). Accordingly, there is no need for a separate internet line laying cost or line connection cost, and since it is a facility of the on-site wireless system, there is an advantage that it can respond quickly even if a failure or failure occurs.

  For example, the GPS reference terminal has a function of acquiring assist data received from a GPS satellite from the GPS module at startup and / or periodically (default is 30 minutes) and transmitting the assist data to the assist server.

  In addition, the assist server accumulates assist data received from the GPS reference terminal (maximum 8 planes (with 8 planes so that reception of assist data and distribution to each GPS receiving terminal can be performed simultaneously)) Distribution is performed based on an assist data distribution request from the receiving terminal. In addition, if there is a restriction on the location of the GPS reference terminal, etc., if one GPS reference terminal cannot always acquire GPS satellite radio waves in good condition, it is possible to install multiple GPS reference terminals. If GPS assist data can be acquired even with one GPS reference terminal, the information may be accumulated and other GPS assist data received within 30 minutes may be discarded.

  When the GPS receiver terminal is in the out-of-service state of the GPS satellite for 2 hours (15 minutes × 8 times monitoring), it sends an assist data delivery request to the assist server to obtain the latest assist data, Perform positioning.

  As a method of operation, by setting the system ID of the radio base station to which the GPS reference terminal and the GPS reference terminal are connected to be the same as the system ID used by other PHS (GPS receiver terminals), the radio base for the GPS reference terminal Make sure that no other PHS (GPS receiver terminal) can use the station, and that the GPS reference terminal can send assist data. Note that a radio base station for a GPS reference terminal is not provided, and it is possible to effectively use the radio channel of the radio base station by using the same system ID.

  In addition, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 10 ... GPS reference terminal, 11 ... GPS receiving terminal, 2 ... Wireless base station, 3 ... Control apparatus, 41 ... Assist server, 42 ... Position display server, 5 ... Position display client.

Claims (5)

  1. A local radio system including a plurality of radio base stations having unique system IDs and a plurality of radio terminals connectable to at least one of the plurality of radio base stations,
    At least one of the plurality of wireless terminals, which acquires GPS assist data from a GPS satellite and uses a system ID different from a system ID used by other wireless terminals to Exclusively, a GPS reference terminal that transmits to the assist server connected to the local wireless system,
    A wireless terminal other than the GPS reference terminal, a GPS receiving terminal capable of receiving a GPS signal from the GPS satellite,
    A private wireless system comprising: the assist server for delivering GPS assist data received from the GPS reference terminal in accordance with a GPS assist data delivery request from the GPS receiving terminal.
  2.   The local radio system according to claim 1, wherein the GPS reference terminal acquires the GPS assist data from the GPS satellite and transmits the GPS assist data to the assist server at startup and / or periodically.
  3.   The local radio system according to claim 1 or 2, wherein the GPS receiving terminal transmits a GPS assist data distribution request to the assist server when a GPS out-of-range state continues for a certain period of time.
  4.   The GPS reference terminal confirms that the GPS assist data is within the GPS range when acquiring the GPS assist data from the GPS satellite, completes the GPS assist data acquisition if it is out of the GPS range, and from the GPS satellite if within the GPS range. 4. The premises according to claim 1, wherein the acquired GPS assist data is stored in a GPS assist data notification area for transmission to the assist server, and the GPS assist data acquisition is completed. 5. Wireless system.
  5. The GPS receiving terminal is
    Sending the GPS assist data delivery request to the assist server as a trigger of location registration completion,
    Write to the GPS module in the GPS receiving terminal when receiving the GPS assist data,
    5. The local radio according to claim 1, wherein GPS out-of-range / in-range monitoring is periodically performed, and the GPS assist data distribution request is transmitted when the out-of-range state continues for a predetermined time. system.
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