JP2010068050A - Wireless synchronization system and wireless synchronization method - Google Patents

Wireless synchronization system and wireless synchronization method Download PDF

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Publication number
JP2010068050A
JP2010068050A JP2008230200A JP2008230200A JP2010068050A JP 2010068050 A JP2010068050 A JP 2010068050A JP 2008230200 A JP2008230200 A JP 2008230200A JP 2008230200 A JP2008230200 A JP 2008230200A JP 2010068050 A JP2010068050 A JP 2010068050A
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intermittent
wireless
base station
wireless terminal
message
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Hiroki Kamiya
Satoshi Kotabe
Hiroshi Shibata
Koichi Takasugi
Hidenori Toshinaga
秀紀 俊長
悟士 小田部
弘 柴田
弘樹 神谷
耕一 高杉
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Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks

Abstract

<P>PROBLEM TO BE SOLVED: To reduce consumption of resources of a wireless band by sharing an intermittent parameter between a wireless terminal and a wireless base station without using a wireless communication path. <P>SOLUTION: Intermittent parameters previously set in advance are stored in a wireless terminal 101 to execute an intermittent operation. The intermittent parameters relating to all the wireless terminals 101 are registered in an intra-database wireless terminal information table 411 of a database 401 on a network and are integrally managed. Upon receiving a message (such as a call request) to a certain wireless terminal 101, a wireless base station controller 301 acquires an intermittent parameter of the wireless terminal 101 from the database 401, and notifies the acquired parameter to a wireless base station 201 for housing the wireless terminal 101. The wireless base station 201 calculates a transmission timing (intermittent timing) based on the received intermittent parameter, and transmits the message to the wireless terminal 101. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless synchronization system including a wireless terminal, a wireless base station, and a wireless base station control device, and more particularly, a wireless synchronization system that intermittently receives a signal transmitted from a wireless base station in a wireless terminal. And a wireless synchronization method.

  In the wireless synchronization system, in order for the wireless terminal to receive the downlink communication transmitted from the wireless base station, it receives “downlink communication data itself” or “notifies that the downlink communication is transmitted. It is necessary to receive “transmission notification information” and then receive downlink communication data. Since the wireless terminal cannot know when downlink communication from the wireless base station occurs, in order to monitor the communication data itself from the wireless base station or the presence / absence of transmission notification information, the wireless terminal does not communicate with the wireless base station. Must be received regularly. On the other hand, even when data communication is not performed when information from the radio base station is always received, it is necessary to receive control information from the radio base station. During reception, power required for the radio transceiver circuit unit of the radio terminal is received. It is necessary to supply.

  Wireless terminals are often driven by batteries or rechargeable batteries because of portability and ease of installation. When there is a limit to the power that can be supplied in this way, it takes labor to replace and charge the battery, so it is necessary to save power consumption of the wireless terminal.

  As means for solving this, intermittent operation has been proposed. In intermittent operation, control information (control message) is exchanged between the wireless base station and the wireless terminal at a predetermined timing, so that power is supplied to the wireless transceiver circuit unit of the wireless terminal only when necessary, otherwise Is a very small power supply or interrupts the power supply.

  In the conventional intermittent operation, intermittent parameters necessary for the intermittent operation are transmitted from the wireless base station to the wireless terminal using a wireless communication path in advance. The intermittent parameters include an intermittent offset value and an intermittent interval time. The intermittent offset value is an offset value from the reference absolute time (reference time), and is calculated by adding the intermittent interval time to the value obtained by adding the offset value from the absolute time. In this case, the synchronous timing in intermittent operation is obtained by the following equation.

“T = Tb + Of + TI × n (n = 0, 1, 2,...)”
However, Tb: reference time, Of: intermittent offset value (0 = <Of <TI), TI: intermittent interval time.

  If the intermittent interval increases, communication delay increases, but power consumption decreases. Conversely, if the intermittent interval is reduced, the communication delay is reduced but the power consumption is increased. Therefore, the intermittent interval is determined according to the use of the terminal (battery exchange interval, allowable communication delay range, etc.). In the wireless base station, from the viewpoint of effective use of a certain wireless communication path, the wireless communication path should be used as uniformly as possible to each wireless terminal so that communication of many wireless terminals is not concentrated at a specific timing. Need to control. Therefore, when the intermittent offset values of the wireless terminals under the wireless base station are assigned so as to have a uniform distribution, the wireless communication path can be most effectively used.

As an example in which the terminal operates intermittently, a two-way communication tag system of the prior art is disclosed (see Non-Patent Document 1). In this bi-directional communication tag system, the bi-directional communication tag performs intermittent communication that periodically repeats a time during which the wireless unit is activated (active) and a time during which it is stopped (sleep) for power saving. It is configured. This active period is composed of a plurality of fixed-length time slots, and the transmission timing is adjusted autonomously and distributedly based on a slot CSMA (Carrier Sense Multiple Access). The time slot in which no transmission is performed is used as a reception slot for receiving information from other tags. Such a configuration enables mutual communication between a plurality of tags. Furthermore, the timing information of the “active period” is added to the data to be transmitted, and the radio unit activation of the tag is performed by performing readjustment of the synchronization with respect to the active period from the received data of a plurality of tags according to the specified priority. Timing synchronization is possible.
Kawakami, Miyamoto, "Two-way communication tag system that provides a new information exchange infrastructure by tag communication", Matsushita, Technical, Journal, Vol. 54.No.1.Apr.2008, p.60-61.

  As described above, in a conventional wireless synchronization system in which a wireless terminal performs an intermittent operation, the wireless base station notifies the wireless terminal of intermittent parameters related to the intermittent operation using a wireless line to execute the intermittent operation. In order to exchange the intermittent parameter as a control signal, there is a problem that the utilization efficiency of the wireless line is lowered.

  A first object of the present invention is to enable intermittent parameters to be shared between a wireless terminal and a wireless base station without using a wireless communication path, and to reduce the consumption of resources in the wireless band constituting the wireless communication path. An object of the present invention is to provide a wireless synchronization system and a wireless synchronization method that can be reduced and effectively used.

  In addition, the second object of the present invention is to make the intermittent timing at which a wireless terminal receives a signal close to a uniform distribution and bias to a specific intermittent timing when a sufficiently large number of wireless terminals are connected to the wireless base station. The present invention provides a wireless synchronization system and a wireless synchronization method that can effectively use a wireless band.

  The present invention has been made in order to solve the above-described problems, and a radio base station, a plurality of radio base stations that are communicatively connected to the radio terminal, and a radio base station control that controls one or more radio base stations A wireless synchronization system including a device and a database that is connected to the wireless base station control device and registers information related to the intermittent reception operation of the wireless terminal, wherein the wireless terminal uses a preset intermittent parameter An intermittent reception timing for intermittently receiving a signal transmitted from the wireless base station, and an intermittent reception control unit that performs an intermittent reception operation according to the intermittent reception timing; A wireless terminal information table in the database for registering the intermittent parameter set in the wireless base station control device, the wireless base station control device When transmitting a message, the database search request unit that requests and receives the intermittent parameter transmission related to the wireless terminal in the database, and the intermittently received from the database to the wireless base station that subordinates the wireless terminal A message transmission unit that generates and transmits a message including a parameter, and the radio base station receives a message addressed to the radio terminal from the radio base station control device, and receives the message from the radio base station control device. Based on the intermittent parameter included in the received message, a transmission timing control unit that calculates transmission timing for transmitting a message to the wireless terminal, and a transmission generated by the transmission timing control unit that generates a message for the wireless terminal A message transmission unit for transmitting at a timing, A wireless synchronization system according to symptoms.

  Further, the present invention is characterized in that the intermittent parameter includes an intermittent interval time TI and an intermittent offset value Of, and the intermittent offset value Of is determined based on a random number less than the intermittent interval time TI. The wireless synchronization system according to claim 1.

  Further, according to the present invention, the intermittent reception timing T in the wireless terminal is determined based on the reference time Tb generated based on a predetermined signal transmitted from the wireless base station. The intermittent reception timing T = the reference time Tb + the intermittent offset value Of + n. 3. The wireless synchronization system according to claim 1, wherein the wireless synchronization system is calculated by an intermittent interval time TI (n = 1, 2, 3,...).

  In the wireless terminal, the intermittent parameter is set in a storage area at the time of shipment of the wireless terminal, and the intermittent parameter is shared between the wireless terminal and the database. The wireless synchronization system according to any one of claims 1 to 3, wherein:

  Also, the present invention is configured such that there are a plurality of the databases, and information on intermittent parameters of the wireless terminal is distributed and registered in a plurality of databases. A wireless synchronization system according to any one of the above.

  In the present invention, the radio base station associates a terminal ID (identifier) of a radio terminal included in a message received from the radio base station controller and an intermittent parameter corresponding to the terminal ID of the radio terminal. A base station radio terminal information table to be recorded; when a message addressed to the radio terminal is received from the radio base station controller, the base station radio terminal information table is searched based on the terminal ID; When the terminal ID of the wireless terminal is included in the in-station wireless terminal information table, information on intermittent parameters recorded in the in-base station wireless terminal information table is used, and the wireless terminal is stored in the in-base station wireless terminal information table. Is not included, based on the intermittent parameter included in the message received from the radio base station controller, the basic ID is not included. 6. The wireless terminal information table according to any one of claims 1 to 5, wherein an entry for the terminal ID is added to the in-station wireless terminal information table to write intermittent parameters and the written intermittent parameters are used. It is a radio | wireless synchronous system as described in above.

  In the present invention, the intermittent parameter further includes a continuous mode end timer timeout value Tc, and the wireless terminal includes a continuous mode end timer for counting the continuous mode end timer timeout value Tc, Each time a predetermined message is transmitted to and received from a station, the continuous mode end timer counts the continuous mode end timer timeout value Tc by the continuous mode end timer, and the radio base station is in a period until the continuous mode end timer times out The wireless synchronization system according to any one of claims 1 to 6, wherein the wireless synchronization system is configured to shift to a continuous mode in which messages transmitted from the terminal are continuously received.

  In the present invention, the wireless base station includes a continuous mode end timer that counts the continuous mode end timer timeout value Tc in a wireless terminal that is a target of transmitting and receiving a message, For each message transmission / reception, the continuous mode end timer counts the continuous mode end timer timeout value Tc, and determines that the wireless terminal is in the continuous mode for the time until the continuous mode end timer times out, The wireless synchronization system according to claim 7, wherein the wireless synchronization system is configured to continuously transmit messages to the wireless terminal.

  In addition, the present invention provides a radio terminal, a plurality of radio base stations that are communicatively connected to the radio terminal, a radio base station controller that controls one or more radio base stations, and the radio base station controller. A wireless synchronization method in a wireless synchronization system configured to include a database for registering information related to intermittent reception operation of the wireless terminal connected for communication, based on intermittent parameters set in advance by a control unit in the wireless terminal An intermittent reception control procedure for calculating an intermittent reception timing for intermittently receiving a signal transmitted from the wireless base station and performing an intermittent reception operation based on the intermittent reception timing is performed. A procedure for registering the intermittent parameter to be set in the in-database wireless terminal information table is performed, and the control in the wireless base station controller is performed. A database search request procedure for requesting and receiving transmission of the intermittent parameter related to the wireless terminal to the database when transmitting a message addressed to the wireless terminal, and a wireless base station under the wireless terminal On the other hand, a message transmission procedure for generating and transmitting a message including intermittent parameters received from the database is performed, and a message addressed to the wireless terminal is transmitted from the wireless base station controller by the control unit in the wireless base station. When receiving, based on the intermittent parameter included in the message received from the radio base station controller, a transmission timing control procedure for calculating transmission timing for transmitting a message to the radio terminal, and a message for the radio terminal Generated and calculated by the transmission timing control procedure. And a message transmission step of transmitting the grayed, is a radio synchronization method characterized in that it is carried out.

  Further, the present invention is characterized in that the intermittent parameter includes an intermittent interval time TI and an intermittent offset value Of, and the intermittent offset value Of is determined based on a random number less than the intermittent interval time TI. The wireless synchronization method according to claim 9.

In the wireless synchronization system of the present invention, the wireless terminal operates to calculate intermittent reception timing and perform intermittent reception based on intermittent parameters individually set in a storage unit such as a ROM in advance. This intermittent parameter is an intermittent parameter individually set for all wireless terminals, and the intermittent parameter of each wireless terminal is registered in a database installed on the network and managed centrally. When receiving a message (call request, etc.) to a certain wireless terminal, the wireless base station control device accesses the database to acquire the intermittent parameter of the wireless terminal, includes the acquired intermittent parameter in the message, Notification is made to the radio base station that places (accommodates) the terminal. Based on the intermittent parameter received from the wireless base station controller, the wireless base station calculates a transmission timing that matches the intermittent reception timing of the wireless terminal, and transmits a message to the wireless terminal at the transmission timing.
As a result, there is no need to transmit intermittent parameters required for the intermittent reception operation of the wireless terminal from the wireless base station to the wireless terminal, and the resource consumption of the wireless band constituting the wireless communication path can be reduced and effectively used. In addition, the utilization efficiency of the wireless line can be improved.

Further, in the wireless synchronization system of the present invention, the intermittent parameter includes the intermittent interval time TI and the intermittent offset value Of, and the intermittent offset value Of is randomly assigned at 0 (zero) or more and less than the intermittent interval time TI. .
Thereby, in a state where a sufficiently large number of terminals are connected to the radio base station, the intermittent reception timing in the radio terminals approaches a uniform distribution, and the radio band can be effectively used without being biased toward a specific intermittent reception timing. That is, in a situation where a large number of wireless terminals having a low data communication frequency and a small communication amount are connected to the wireless base station, the intermittent timing is distributed more uniformly and the present invention works most effectively.

Further, in the wireless synchronization system of the present invention, the intermittent reception timing T at the wireless terminal is, for example, the time of frame number 0 (zero) in the TDMA frame as the reference time Tb, and “intermittent reception timing T = Tb + Of + n × TI (n = 1, 2, 3,..., Where Of is the intermittent offset value and TI is the intermittent interval time.
Thereby, in a state where a sufficiently large number of terminals are connected to the radio base station, the intermittent reception timing in the radio terminals approaches a uniform distribution, and the radio band can be effectively used without being biased toward a specific intermittent reception timing.

In the wireless synchronization system of the present invention, the intermittent parameter is set in the storage area at the time of shipment of the wireless terminal, and the wireless terminal and the database share the intermittent parameter.
As a result, there is no need to transmit intermittent parameters required for the intermittent reception operation of the wireless terminal from the wireless base station to the wireless terminal, and the resource consumption of the wireless band constituting the wireless communication path can be reduced and effectively used. The use efficiency of the wireless line can be improved. In addition, intermittent parameters of wireless terminals can be managed centrally by a database.

In the wireless synchronization system of the present invention, information on intermittent parameters of wireless terminals is distributed and registered in a plurality of databases.
Thereby, for example, a huge amount of terminal information of 1 billion to 10 billion units can be distributed and managed by a plurality of databases.

In the wireless synchronization system of the present invention, the wireless base station has an in-base station wireless terminal information table that records the terminal ID of the wireless terminal and the intermittent parameter of the terminal ID in association with each other. When a message addressed to a wireless terminal is received from the wireless base station controller, the base station wireless terminal information table is searched based on the terminal ID. If the terminal ID of the wireless terminal is included, The intermittent parameter recorded in the wireless terminal information table is used. Further, when the terminal ID of the wireless terminal is not included in the base station wireless terminal information table, an entry of the terminal ID of the wireless terminal is added, and the intermittent parameter included in the message received from the wireless base station controller is set. Write. Based on the intermittent parameters recorded in the wireless terminal information table in the base station, the transmission timing in accordance with the intermittent reception timing in the wireless terminal is calculated, and the message is transmitted.
Thereby, the intermittent parameter of the wireless terminal can be held in advance in the wireless base station. For this reason, in the calculation process of the transmission timing required when transmitting a message from the radio base station to the radio terminal, the processing time can be reduced.

In the wireless synchronization system of the present invention, the wireless terminal includes a continuous mode end timer that counts a continuous mode end timer timeout value Tc, and the continuous mode ends after transmission / reception of a predetermined message to / from the radio base. During the time until the timer times out, messages transmitted from the radio base station are continuously received.
Thereby, after transmission / reception of a predetermined message, message transmission / reception can be performed in a continuous mode between the wireless terminal and the wireless base station, and transmission / reception of a necessary message can be performed without delay.

Further, in the wireless synchronization system of the present invention, the wireless base station has a continuous mode end timer for counting the continuous mode duration in the wireless terminal, and after the transmission / reception of a message with the wireless terminal, the continuous mode end timer It is determined that the wireless terminal is in the continuous mode during the time until the timeout occurs. In this continuous mode, necessary messages are continuously transmitted to the wireless terminal.
Thereby, after a message and transmission / reception with a wireless terminal, a necessary message can be continuously transmitted / received in the continuous mode, and a message can be transmitted / received without causing a communication delay.

Further, in the wireless synchronization method of the present invention, the wireless terminal operates so as to perform intermittent reception by calculating intermittent reception timing based on intermittent parameters individually set in advance in a storage unit such as a ROM. This intermittent parameter is an intermittent parameter individually set for all wireless terminals, and the intermittent parameter of each wireless terminal is registered in a database installed on the network and managed centrally. When receiving a message (call request, etc.) to a certain wireless terminal, the wireless base station control device accesses the database to acquire the intermittent parameter of the wireless terminal, includes the acquired intermittent parameter in the message, Notification is made to the radio base station that places (accommodates) the terminal. Based on the intermittent parameter received from the wireless base station controller, the wireless base station calculates a transmission timing that matches the intermittent reception timing of the wireless terminal, and transmits a message to the wireless terminal at the transmission timing.
As a result, there is no need to transmit intermittent parameters required for the intermittent reception operation of the wireless terminal from the wireless base station to the wireless terminal, and the resource consumption of the wireless band constituting the wireless communication path can be reduced and effectively used. In addition, the utilization efficiency of the wireless line can be improved.

Further, in the wireless synchronization method of the present invention, the intermittent parameter includes the intermittent interval time TI and the intermittent offset value Of, and the intermittent offset value Of is randomly assigned at 0 (zero) or more and less than the intermittent interval time TI. .
Thereby, in a state where a sufficiently large number of terminals are connected to the radio base station, the intermittent reception timing in the radio terminals approaches a uniform distribution, and the radio band can be effectively used without being biased toward a specific intermittent reception timing. That is, in a situation where a large number of wireless terminals having a low data communication frequency and a small communication amount are connected to the wireless base station, the intermittent timing is distributed more uniformly and the present invention works most effectively.

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

  FIG. 1 is a diagram illustrating an overall configuration of a wireless synchronization system according to an embodiment of the present invention, and is a diagram illustrating an overall network configuration using the wireless synchronization system of the present invention.

  The radio synchronization system shown in FIG. 1 includes a plurality of radio terminals 101, radio base stations 201 and 202 that accommodate the radio terminals 101 by radio channels, and a radio base station controller 301 that controls the radio base stations 201 and 202. The wireless base station control apparatus 302 that controls the wireless base station 203 and the databases 401 and 402 that store the area where the wireless terminal 101 is located. In addition, the databases 401 and 402 manage a large amount of terminal information on the scale of 1 billion to 10 billion by a plurality of devices.

  The radio base station control device 301 is connected to and communicates with the radio base station control device 302 through the communication network 11. Further, the radio base station control device 301 is connected to the databases 401 and 402 directly or via the communication network 11.

  The radio base station control device 302 is connected to the radio base station control device 301 through the communication network 11. The radio base station control apparatus 302 is connected to the databases 401 and 402 directly or via the communication network 11. In addition, an IP terminal 12 or the like is connected to the communication network 11.

  The radio base station control devices 301 and 302 read and write terminal information to and from the databases 401 and 402 as necessary.

  In the example shown in FIG. 1, only three radio base stations are shown and only two radio base station control devices are shown. The same applies to the database.

  FIG. 2 is a diagram illustrating a configuration example of the wireless terminal 101, the wireless base station 201, and the wireless base station control device 301 in the wireless synchronization system illustrated in FIG. 1, and illustrates only a portion directly related to the present invention. is there. 2, the outline of the configuration of the wireless synchronization system will be described, and the detailed operation of the wireless synchronization system will be described with reference to the timing chart shown in FIG. 3 and the sequences shown in FIGS. 6, 7, 8, and 9. This will be described with reference to the drawings.

  In FIG. 2, the wireless terminal 101 has a control unit 111 including a CPU (Central Processing Unit), and the control unit 111 controls each processing unit in the wireless terminal 101 in an integrated manner. Is configured to realize its function.

  The wireless transmission / reception circuit unit 112 is a wireless communication circuit including a high frequency circuit for transmitting / receiving a wireless signal to / from the wireless base station 201. The message transmission / reception unit 113 is a processing unit for transmitting / receiving a message to / from the radio base station 201. This message includes “broadcast information”, “call message”, “downlink message addressed to own terminal” from the radio base station 201, and “uplink” in which the radio terminal 101 performs location registration, data communication, and the like. Message ". In this message transmission / reception unit 113, a message reception unit (not shown) that receives a message from the radio base station 201, and a message transmission unit (not shown) that generates and transmits a message to be transmitted to the radio base station 201. And have.

  The intermittent reception control unit 114 includes an intermittent timing calculation unit 115 that calculates an intermittent timing for intermittently receiving a message from the radio base station 201 in the intermittent mode (a mode in which intermittent operation is performed). . This intermittent mode is a mode in which notification information or the like from the radio base station 201 is received at each intermittent interval time TI and the operation is performed based on it. The intermittent reception timing is a time obtained by multiplying the intermittent time interval TI by an integer from a value obtained by adding the intermittent offset value Of to a reference time Tb that is a reference absolute time (for example, frame number 0 of the TDMA frame). And

  In this case, the intermittent reception timing T in the intermittent operation is obtained by the following equation.

“T = Tb + Of + TI × n (n = 0, 1, 2,...)”,
However, Tb: reference time, Of: intermittent offset value (0 = <Of <I), TI: intermittent interval. Here, the intermittent offset value Of is determined at random using, for example, random numbers in order to shift the intermittent reception timing between wireless terminals.

  These intermittent offset value Of and intermittent interval time TI are stored in advance in the memory 121 (ROM or the like) in the wireless terminal 101 as intermittent parameters.

  In addition, the intermittent reception control unit 114 performs the continuous mode when the wireless terminal 101 shifts to a continuous mode in which communication with the wireless base station 201 is continuously performed after transmission / reception of a message to / from the wireless base station 201. Has a continuous mode end timer 116 for counting the duration of the continuous mode. In this continuous mode, a continuous mode end timer timeout value Tc is set in the continuous mode end timer 116 for each message transmission / reception, and when the continuous mode end timer 116 times out after the continuous mode end timer timeout value Tc elapses, The wireless terminal 101 shifts from the continuous mode to the intermittent mode.

  The memory 121 is a storage unit such as a ROM. The memory 121 includes a terminal ID and intermittent parameters (intermittent offset value Of, intermittent interval time TI, continuous mode end timer timeout value Tc, etc.). .

  Next, the configuration of radio base station 201 shown in FIG. 2 will be described. The radio base station 201 has a control unit 211 including a CPU. The control unit 211 controls each processing unit in the radio base station 201 in an integrated manner, and the radio base station 201 can realize its function. It is configured as follows.

  The wireless transmission / reception circuit unit 212 is a wireless communication circuit including a high-frequency circuit for transmitting / receiving a wireless signal to / from the wireless terminal 101.

  The message transmission / reception unit 213 is a processing unit for transmitting / receiving a message between the wireless terminal 101 and the wireless base station control device 301. This message includes “notification information” to the wireless terminal 101, “calling message for wireless terminal”, “downlink message addressed to the wireless terminal”, or “uplink” such as location registration and data communication transmitted from the wireless terminal 101. Message ". In this message transmission / reception unit 213, a message reception unit (not shown) that receives a message from the radio terminal 101 and the radio base station control device 301, and a message that is transmitted to the radio terminal 101 and the radio base station control device 301 are generated. And a message transmission unit (not shown) for transmission.

  The transmission timing control unit 214 includes an intermittent timing calculation unit 215. The intermittent timing calculation unit 215 uses the intermittent timing calculation unit 215 to determine the intermittent reception timing (intermittent interval) of the wireless terminal 101 based on the intermittent parameters of the wireless terminal 101 to be communicated. ) Is synchronized, and a message such as a call message is transmitted to the wireless terminal 101 at this transmission timing.

  The transmission timing control unit 214 also includes a continuous mode end timer 216 for determining (counting) the continuous mode duration in the wireless terminal 101 after transmitting / receiving a message to / from the wireless terminal 101. Each time a message is transmitted to or received from the wireless terminal 101, the continuous mode end timer timeout value Tc is set in the continuous mode end timer 216. After the continuous mode end timer timeout value Tc elapses, the continuous mode in the wireless terminal 101 ends. Is determined.

  In the continuous mode described above, a message such as a call message transmitted from the wireless base station 201 to the wireless terminal 101 is transmitted regardless of the intermittent timing. Further, messages (broadcast and multicast) addressed to a plurality of wireless terminals are always transmitted regardless of the intermittent timing regardless of the continuous mode and the intermittent mode.

  When receiving a message (message including information on “terminal ID” and “intermittent parameter” such as a call request) from the radio base station control device 301, the radio terminal information table search unit 217 receives the base in the intra-base station database 221. The intra-station wireless terminal information table 222 is searched based on the terminal ID, and when the “terminal ID” of the wireless terminal is included in the base station wireless terminal information table 222, the terminal ID is retrieved from the base station wireless terminal information table 222. Are extracted and transmitted to the transmission timing control unit 214.

When the wireless terminal information table registration unit 218 receives a message received from the wireless base station control device 301 (message including information on “terminal ID” and “intermittent parameter” such as a call request), the wireless terminal information table registration unit 218 The base station wireless terminal information table 222 is searched based on the terminal ID, and if the base station wireless terminal information table 222 does not include the terminal ID of the wireless terminal 101, the terminal ID entry of the wireless terminal 101 is entered. In addition, the intermittent parameter included in the message received from the radio base station controller 301 is written.
Note that the received intermittent parameter may be overwritten regardless of the terminal ID registration state in the base station wireless terminal information table 222 (even if the terminal ID has already been registered).

  FIG. 4 is a diagram illustrating an example of an intra-base station radio terminal information table in a radio base station. In the radio base station, an intermittent interval time TI, an intermittent offset value Of, and a continuous mode of a radio terminal connected to the radio base station. The base station wireless terminal information table 222 holds the timeout value Tc of the end timer and whether the wireless terminal is operating in “intermittent mode” or “continuous mode”.

Next, the configuration of radio base station control apparatus 301 shown in FIG. 2 will be described.
The radio base station control device 301 has a control unit 311 including a CPU. The control unit 311 controls each processing unit in the radio base station control device 301 in an integrated manner, and the radio base station control device 301. Is configured to realize its function.

  The message transmission / reception unit 312 is a processing unit for transmitting / receiving a message to / from the radio base station 201 or another radio base station control device. This message includes a “call message (“ call request ””) transmitted to the radio base station 201 and a “data transmission message addressed to the radio terminal” transmitted to the radio base station 201.

  When the database search request unit 313 transmits a message (for example, “call request” or the like) to the radio base station 201, the database search request unit 313 sends a “wireless terminal information search request” including information on the terminal ID to the database 401. The process of transmitting and acquiring intermittent parameters from the database 401 is performed.

  In the database 401, an in-database wireless terminal information table 411 is registered. FIG. 5 is a diagram showing an example of the in-database wireless terminal information table in the database. In the database wireless terminal information table, “terminal ID”, “intermittent interval time TI”, “intermittent offset value Of” of all wireless terminals are shown. And “timeout value Tc of continuous mode end timer” are held.

  With the above-described configuration of the wireless synchronization system of the present invention, the wireless terminal 101 operates to calculate intermittent reception timing and perform intermittent reception based on intermittent parameters individually set in advance in a storage unit such as a ROM. This intermittent parameter is an intermittent parameter set individually for all the wireless terminals 101, and the intermittent parameter of each wireless terminal 101 is registered in the database 401 installed on the network and managed centrally. When receiving a message (call request or the like) addressed to a certain wireless terminal, the wireless base station control device 301 accesses the database to acquire the intermittent parameter of the wireless terminal 101, includes the acquired intermittent parameter in the message, Notification is made to the radio base station 201 that places (accommodates) the radio terminal 101 under control. Based on the intermittent parameter received from the wireless base station control device 301, the wireless base station 201 calculates a transmission timing that matches the intermittent reception timing of the wireless terminal 101, and transmits a message to the wireless terminal 101 at the transmission timing.

  With such a configuration, intermittent parameters are centrally managed in the database 401 on the wired network side, and the intermittent parameters are set in a storage area (memory or the like) of the wireless terminal when the wireless terminal is shipped. Therefore, intermittent parameters can be shared between the wireless terminal and the database, and it is not essential to transmit and receive intermittent parameters over the wireless communication path. Therefore, it can be effectively used without consuming radio band resources constituting the radio communication path.

  In the example shown in FIG. 1 and FIG. 2, an example is shown in which the radio base station and the radio base station control device are independent. Of course, the radio base station and the radio base station control device are integrated. It may be.

  In the radio synchronization system shown in FIGS. 1 and 2, when the radio base station control apparatus receives a message addressed to a radio terminal, the radio base station control apparatus acquires an intermittent parameter from the database, Although an example of notifying the radio base station together with the message is shown, the present invention is not limited to this, and there may be a case where the radio base station receives the message addressed to the radio terminal and then accesses the database to acquire intermittent parameters. .

  In addition, there may be a case where the radio base station acquires the intermittent parameter using a message (for example, an authentication message) different from the message addressed to the radio terminal.

  Further, there may be a case where the radio base station generates a message addressed to the unique radio terminal without using the message transmitted from the radio base station control device. In this case, the radio base station accesses the database and acquires intermittent parameters.

  FIG. 3 is a diagram illustrating data transmission / reception timing between the radio base station and the radio terminal, timing for transmitting / receiving data between the radio base station and the radio terminal, and transition timing between the intermittent mode and the continuous mode. Is shown. The operation will be described below with reference to FIG. In the description of FIG. 3, the description duplicated with the description in FIG.

  The wireless terminal 101 stores the “terminal ID” of the terminal itself and “intermittent offset value Of”, “intermittent interval time TI”, and “continuous mode end timer timeout value Tc” as intermittent parameters in a memory 121 such as a ROM. . The intermittent offset value Of takes a value between 0 and the intermittent interval time TI.

  In addition, the intermittent offset value Of is desirably allocated uniformly between wireless terminals in order to shift the intermittent reception timing between wireless terminals. For example, a random value may be determined by a random number.

  The wireless terminal 101 has an intermittent mode (period of time t1 to t3) and a continuous mode (period of time t3 to t4) regarding transmission and reception with the wireless base station 201, and always operates in either mode. The continuous mode is a mode in which messages (broadcast information and the like) from the radio base station 201 are continuously received in all frames (time slots) such as TDMA frames and the operation is performed based on the messages.

  The intermittent mode is a mode in which a message (notification information or the like) is received from the radio base station 201 at every intermittent interval time TI and the operation is performed based on the message. The intermittent reception timing is obtained by adding a time obtained by multiplying the intermittent absolute time TI by an integer to a value obtained by adding an intermittent offset value Of to a reference absolute time (for example, time t0 of frame number 0 of the TDMA frame). To do.

  In this case, the intermittent reception timing T in the intermittent operation is obtained by the following equation as described above.

“T = Tb + Of + TI × n (n = 0, 1, 2,...)”,
However, Tb: reference time, Of: intermittent offset value (0 = <Of <I), TI: intermittent interval.

  The intermittent reception timing T is a timing indicated by times t1, t2, t3, t4, t5, and t6 in FIG.

  In the example illustrated in FIG. 3, the radio base station 201 transmits a message (calling or the like) A <b> 2 to the radio terminal 101 in accordance with the intermittent reception timing T (for example, time t <b> 3) of the radio terminal 101. The message A2 transmitted from the radio base station 201 to the radio terminal 101 is generated by the radio base station 201 when the radio base station 201 receives a control message (call request or the like) A1 from the radio base station controller 301. Message. In this case, the radio base station 201 calculates the intermittent reception timing t3 at the radio terminal 101 based on the intermittent parameter of the radio terminal 101 to be called, and sends the message A2 to the radio at the time t3. Transmit to the terminal 101.

  Further, the transition from the intermittent mode (time t1 to t3) to the continuous mode (time t3 to t4) is “call” or “downlink message addressed to own terminal” as in the control message A2 of the radio base station 201. Is performed, or when the wireless terminal 101 determines that “upstream message transmission” such as location registration or data communication is necessary.

  In addition, the transition from the continuous mode (time t3 to t4) to the intermittent mode (time t4 to) in the wireless terminal 101 is performed in the continuous mode end timer for each transmission / reception of messages B and C in the wireless terminal 101. This is a case where the value Tc is set and the continuous mode end timer times out after the continuous mode end timer timeout value Tc elapses. If the continuous mode end timer is already set when the continuous mode end timer is set, the count value of the previous continuous mode end timer is discarded, the new continuous mode end timer is reset, and counting is restarted from the beginning. . The counting period of the continuous mode end timer in the wireless terminal 101 is denoted by reference sign D1.

  The wireless base station 201 also performs an operation of determining that the wireless terminal 101 has shifted from the continuous mode (time t3 to t4) to the intermittent mode (time t4 to). For this purpose, the wireless base station 201 sets a continuous mode end timer for each transmission / reception of messages B and C with the wireless terminal 101, and after the continuous mode end timer timeout value Tc in the continuous mode end timer has elapsed, It is determined that the continuous mode in the wireless terminal 101 has ended. A counting period of the continuous mode end timer in the radio base station 201 is indicated by a symbol D2.

  The continuous mode end timer timeout value Tc is set in consideration of a trade-off between battery life and delay. If the continuous mode end timer timeout value Tc is set to be longer, when several messages are exchanged continuously, the message can be transmitted and received without shifting to the intermittent mode. The delay time of messages other than messages from the terminal to the radio base station can be reduced. On the other hand, in this case, since the continuous mode is unnecessarily continued after the message does not come continuously or after the last message of the continuous message is received, power is consumed and the battery life of the wireless terminal is shortened. The continuous mode end timer timeout value Tc may be set for each wireless terminal, but may be a constant value for the entire system.

  In addition, the intermittent interval time TI also affects the battery life and the message delay (from the radio base station to the radio base station). If the intermittent interval time TI is lengthened, it is necessary to wait for the intermittent interval time TI at the maximum in order to transmit and receive downlink data messages, calling, and downlink control messages such as base station information necessary for location registration. This means that it takes time until the data message is actually transmitted after the data transmission command is received at the radio base station, and the delay of the data message increases. However, if the intermittent interval time TI is long, the interval for supplying power to the transmission / reception unit of the wireless terminal becomes long, the power can be reduced, and the battery life of the wireless terminal becomes long.

  On the other hand, regarding the uplink data message, the wireless terminal can receive the data message, supply power to the wireless transmission / reception circuit unit without waiting for the next intermittent reception timing, and transmit it to the wireless base station.

  Next, the wireless base station controller notifies the wireless base station of the “intermittent parameter of the wireless terminal”, and the operation when the wireless base station adds the information of the wireless terminal to the wireless terminal information table in the base station is described. To do.

  As an example of this operation, “calling” and “authentication” are taken as examples of the situation in which the wireless base station connects to the wireless terminal.

  “Calling” is an operation of specifying a wireless base station with which a wireless terminal can communicate in order to transmit data to the wireless terminal. After the call, the process proceeds to a connection procedure between the wireless terminal and the wireless base station such as authentication, and then data is transmitted to the wireless terminal.

“Authentication” is a connection procedure in the case where the location information is notified to the database on the network or the data is transmitted from the wireless terminal when the wireless terminal moves beyond the calling area. This “authentication” is a procedure for confirming the validity of the wireless terminal when the wireless terminal is connected to the wireless base station, such as when transmitting data.
Note that the call and authentication are the first message transmitted from the radio base station to the radio terminal, so the radio base station controller transmits the intermittent parameter to the radio base station together with the first message (for example, authentication and call message). Then, the wireless base station stores the received intermittent parameter together with the terminal ID, so that the wireless base station control device can prevent the intermittent parameter from being transmitted to the wireless base station in a subsequent message.

  FIG. 6 is a sequence diagram showing an operation at the time of calling. The operation will be described below with reference to FIG.

  When calling the wireless terminal 101 through the wireless base station 201, the wireless base station control device 301 inquires of the database 401 and acquires intermittent parameters of the calling wireless terminal. In this case, first, as a message for the database 401 from the radio base station control apparatus 301, a “wireless terminal information search request” is transmitted together with information on “terminal ID” (step S101).

  When the database 401 receives a “wireless terminal information search request” from the wireless base station control device 301, the database 401 searches the wireless terminal information table 411 in the database based on the information of the terminal ID, and performs intermittent parameters (intermittent) of the wireless terminal 101. The interval time TI, the intermittent offset value Of, and the continuous mode end timer timeout value Tc) are extracted (step S102).

  Thereafter, the database 401 transmits a “wireless terminal information search response” including intermittent parameter information as a message to the wireless base station control device 301 (step S103).

  The radio base station control device 301 generates a call message (call request) together with the intermittent parameter included in the “wireless terminal information search response” received from the database 401, and transmits the call message to the radio base station 201 (step S104). The call message (call request) transmitted to the wireless base station 201 includes information on the “terminal ID” and “intermittent parameter” of the wireless terminal 101.

  Upon receiving the call message (call request) from the radio base station control device 301, the radio base station 201 searches the base station radio terminal information table 222 based on the “terminal ID” and stores it in the base station radio terminal information table 122. It is determined whether or not the “terminal ID” of the wireless terminal 101 is included (step S105).

  When the search is successful in step S105, that is, when it is determined that the “terminal ID” of the wireless terminal 101 is included in the base station wireless terminal information table 222 (step S105: Yes), the base station wireless terminal Information on intermittent parameters recorded in the information table 222 is used (step S106).

  On the other hand, if it is determined in step S105 that the “terminal ID” of the wireless terminal 101 is not included in the base station wireless terminal information table 222 (step S105: No), the intermittent parameter of the call message (call request) Based on the above, an entry is added to the wireless terminal information table 222 in the base station, and intermittent parameters are written (step S107).

  Subsequently, the wireless base station 201 calculates intermittent timing (transmission timing for the wireless terminal 101) based on the intermittent parameter in the in-base station wireless terminal information table 222 and generates a call message (call request) for the wireless terminal 101. (Step S108).

  The radio base station 201 transmits a call control message (call request) to the radio terminal 101 at the intermittent timing calculated in step S108 (step S109). This call control message (call request) includes information on the “terminal ID” of the wireless terminal to be called. In addition, after transmitting a call message (call request) to the wireless terminal 101, the wireless base station 201 transmits a call response from the wireless terminal 101 to the wireless base station control apparatus 301 (step S110).

  FIG. 7 is a sequence diagram showing an operation during authentication. Hereinafter, the operation will be described with reference to FIG.

  When the wireless terminal 101 moves in the calling area, a “terminal authentication request” is transmitted from the wireless terminal 101 to the wireless base station 201 (step S201). When receiving the “terminal authentication request” from the wireless terminal 101, the wireless base station 201 transmits an authentication message (terminal authentication request) of the wireless terminal 101 to the wireless base station control device 301 (step S202).

  When receiving the authentication message (terminal authentication request) from the wireless base station 201, the wireless base station control device 301 makes an inquiry to the database 401 and acquires the intermittent parameter of the wireless terminal 101 that has transmitted the authentication message. In this case, the wireless base station controller 301 transmits a “wireless terminal information search request” as a message to the database 401 together with the information of “terminal ID” (step S203).

  When the database 401 receives a “wireless terminal information search request” from the wireless base station control device 301, the database 401 searches the wireless terminal information table 411 in the database based on the information of the terminal ID, and performs intermittent parameters (intermittent) of the wireless terminal 101. The interval time TI, the intermittent offset value Of, and the continuous mode end timer timeout value Tc) are extracted (step S204).

  Then, a “wireless terminal information search response” including intermittent parameter information is transmitted from the database 401 to the wireless base station control device 301 (step S205).

  The radio base station control device 301 generates an authentication response message (terminal authentication response) based on the intermittent parameter included in the “wireless terminal information search response” received from the database 401, and transmits it to the radio base station 201 ( Step S206). The authentication response message (terminal authentication response) transmitted to the wireless base station 201 includes information on the “terminal ID” and “intermittent parameter” of the wireless terminal 101.

  Upon receiving the authentication response message (terminal authentication response) from the radio base station control apparatus 301, the radio base station 201 searches the base station radio terminal information table 222 based on the terminal ID, and stores it in the base station radio terminal information table 222. It is determined whether or not the “terminal ID” information of the wireless terminal 101 is included (step S207).

  If the search is successful in step S207, that is, if it is determined that the “terminal ID” of the wireless terminal 101 is included in the base station wireless terminal information table 222 (step S207: Yes), the base station wireless terminal Information on intermittent parameters recorded in the information table 222 is used (step S208). On the other hand, when it is determined in step S207 that the “terminal ID information” of the wireless terminal 101 is not included in the base station wireless terminal information table (step S207: No), an authentication response message (terminal authentication response) Is added to the wireless terminal information table 222 in the base station, and the intermittent parameter is written (step S209).

  Subsequently, the wireless base station 201 calculates an intermittent timing (transmission timing for the wireless terminal 101) based on the intermittent parameter in the in-base station wireless terminal information table 222, and an authentication response message (terminal authentication response) for the wireless terminal 101. Is generated (step S210).

  Subsequently, the wireless base station 201 transmits an authentication response message (terminal authentication response) to the wireless terminal 101 at the intermittent timing calculated based on the intermittent parameter to the wireless terminal 101 (step S211).

  FIG. 8 is a sequence diagram showing a downlink data message transmission method. As shown in FIG. 8, the radio base station control device 301 receives a message (data transmission) to the radio terminal 101 from another radio base station control device or the like (step S301). This message (data transmission) includes “terminal ID” and “data to be transmitted”.

  The radio base station control device 301 transmits the received data message (data transmission) to the radio base station 201 (step S302).

  When receiving a data message (data transmission) from the radio base station controller 301, the radio base station 201 searches the in-base station radio terminal information table 222 by the terminal ID, and acquires the intermittent parameter of the radio terminal 101. Further, the radio base station 201 calculates an intermittent timing (transmission timing for the radio terminal 101) for transmitting a data message (data transmission) based on the intermittent parameter of the radio terminal information table 222 in the base station, and a data message for the radio terminal 101. (Data transmission) is generated (step S303).

  Subsequently, the wireless base station 201 transmits a data message (data transmission) to the wireless terminal 101 based on the calculated intermittent timing (step S304).

  FIG. 9 is a sequence diagram showing a downlink control message transmission method. As shown in FIG. 9, the radio base station 201 receives a control message (xx request) signal for the radio terminal 101 from the radio base station controller 301 (step S401). The control message signal includes the “terminal ID” of the wireless terminal 101.

  When receiving a control message (xx request) signal from the radio base station control device 301, the radio base station 201 searches the base station radio terminal information table 222 by “terminal ID” and acquires the intermittent parameter of the radio terminal 101. To do. Also, the radio base station 201 calculates an intermittent timing (transmission timing for the radio terminal 101) for transmitting a control message (xx request) based on the intermittent parameters of the radio terminal 101 recorded in the radio terminal information table 222 in the base station. At the same time, a control message (xx request) to be transmitted to the wireless terminal 101 is generated (step S402).

  Subsequently, the radio base station 201 transmits a control message (xx request) to the radio terminal 101 based on the calculated intermittent timing (step S403).

  Although the embodiment of the present invention has been described above, in the wireless synchronization system of the present invention, intermittent parameters are centrally managed by a database on the wired network side, and the intermittent parameters are stored in the memory area (ROM, etc.) of the wireless terminal when the wireless terminal is shipped. Set to. As described above, in order to share intermittent parameters between the wireless terminal and the database, it is not essential to transmit / receive the intermittent parameters through the wireless communication path. Therefore, it can be effectively used without consuming radio band resources constituting the radio communication path. Since the radio band is a finite resource, it must be used as effectively as possible. If the amount of use per radio terminal is small, many radio terminals in the same radio band can be accommodated. In addition, since it is not essential to perform data communication after intermittent parameter transmission / reception during data communication, data communication delay is not impaired.

  Further, the intermittent offset value Of is randomly assigned at 0 (zero) or more and less than the intermittent interval time TI. Therefore, in a state where a sufficiently large number of terminals are connected to the radio base station, the intermittent timing approaches a uniform distribution, and the radio band can be effectively used without being biased toward a specific intermittent timing. That is, in a situation where a large number of wireless terminals having a low data communication frequency and a small communication amount are connected to the wireless base station, the intermittent timing is distributed more uniformly and the present invention works most effectively.

  In the above-described embodiment, the intermittent parameter recorded in the database is set as a default value, and the intermittent parameter is previously shared between the wireless base station and the wireless terminal that acquire the intermittent parameter via the database. Although described, it is not limited to this.

  For example, an intermittent parameter can be notified between a wireless base station and a wireless terminal, and a method of changing the intermittent parameter each time can be used together. If the intermittent parameter is not notified between the wireless base station and the wireless terminal, it is sufficient to use the default value of the database. Therefore, whether to notify the intermittent parameter can be determined according to the situation on the spot. That is, when intermittent timing concentrates at a specific timing in the wireless base station, it is also possible to notify only some wireless terminals to change the intermittent timing. However, when the wireless terminal moves and the connection state with the wireless base station connected so far is canceled, the wireless terminal needs to return the intermittent parameter to the default value of the database.

  Although the embodiment of the present invention has been described above, the wireless synchronization system of the present invention is not limited to the above-described illustrated examples, and various modifications can be made without departing from the scope of the present invention. Of course.

It is a figure which shows the whole structure of the radio | wireless synchronization system concerning embodiment of this invention. It is a figure which shows the structural example of a radio | wireless terminal, a radio base station, and a radio base station control apparatus. It is a figure which shows the data transmission / reception timing between a wireless base station and a wireless terminal. It is a figure which shows the example of the radio terminal information table in a base station in a radio base station. It is a figure which shows the example of the wireless terminal information table in a database in a database. It is a sequence diagram which shows the operation | movement at the time of calling. It is a sequence diagram which shows the operation | movement at the time of authentication It is a sequence diagram which shows the transmission method of a downlink data message. It is a sequence diagram which shows the transmission method of a downlink control message.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Communication network, 12 ... IP terminal, 101 ... Wireless terminal, 111 ... Control part, 112 ... Wireless transmission / reception circuit part, 113 ... Message transmission / reception part, 114 ... Intermittent Reception control unit, 115 ... intermittent timing calculation unit, 116 ... continuous mode end timer, 121 ... memory, 201, 202, 203 ... radio base station, 211 ... control unit, 212 ... Wireless transmission / reception circuit unit, 213 ... message transmission / reception unit, 214 ... transmission timing control unit, 215 ... intermittent timing calculation unit, 216 ... continuous mode end timer, 217 ... wireless terminal information table search , 218 ... Wireless terminal information table registration unit, 221 ... Base station database, 222 ... Base station wireless terminal information table, 301, 302 ... Line the base station controller, 311 ... controller, 312 ... message transceiver, 313 ... database search request unit, 401 ... database, 411 ... database within a wireless terminal information table

Claims (10)

  1. A wireless terminal; a plurality of wireless base stations that are connected to communicate with the wireless terminal; a wireless base station controller that controls one or more wireless base stations; and the wireless terminal that is connected to the wireless base station controller A wireless synchronization system composed of a database for registering information on intermittent reception operation of
    The wireless terminal calculates intermittent reception timing for intermittently receiving a signal transmitted from the wireless base station based on a preset intermittent parameter, and performs intermittent reception control for performing an intermittent reception operation based on the intermittent reception timing. With parts
    The database has an in-database wireless terminal information table for registering the intermittent parameter set for each wireless terminal,
    The radio base station controller is
    When sending a message addressed to the wireless terminal,
    A database search request unit for requesting and receiving transmission of the intermittent parameter related to the wireless terminal to the database;
    A message transmitting unit that generates and transmits a message including the intermittent parameter received from the database, to a wireless base station that subordinates the wireless terminal;
    With
    The radio base station is
    When receiving a message addressed to the wireless terminal from the wireless base station controller,
    Based on the intermittent parameter included in the message received from the radio base station controller, a transmission timing control unit that calculates transmission timing for transmitting a message to the radio terminal;
    A message transmission unit that generates a message for the wireless terminal and transmits the message at a transmission timing calculated by the transmission timing control unit;
    A wireless synchronization system comprising:
  2. The intermittent parameters include an intermittent interval time TI and an intermittent offset value Of,
    The wireless synchronization system according to claim 1, wherein the intermittent offset value Of is determined based on a random number less than the intermittent interval time TI.
  3. The intermittent reception timing T in the wireless terminal is
    By a reference time Tb generated based on a predetermined signal transmitted from the radio base station,
    Intermittent reception timing T = reference time Tb + intermittent offset value Of + n × intermittent interval time TI (n = 1, 2, 3,...)
    The wireless synchronization system according to claim 1, wherein the wireless synchronization system is calculated by:
  4. In the wireless terminal,
    The intermittent parameter is set in a storage area when the wireless terminal is shipped,
    The intermittent parameter is configured to be shared between the wireless terminal and the database;
    The wireless synchronization system according to any one of claims 1 to 3, wherein:
  5. There are multiple databases,
    5. The wireless synchronization system according to claim 1, wherein the intermittent parameter information of the wireless terminal is configured to be distributed and registered in a plurality of databases.
  6. The radio base station is
    A wireless terminal information table in the base station that records the terminal ID (identifier) of the wireless terminal included in the message received from the wireless base station control device and the intermittent parameter corresponding to the terminal ID of the wireless terminal in association with each other;
    When receiving a message addressed to the wireless terminal from the wireless base station controller,
    The base station wireless terminal information table is searched based on the terminal ID, and when the terminal ID of the wireless terminal is included in the base station wireless terminal information table, it is recorded in the base station wireless terminal information table. Use information on intermittent parameters,
    If the terminal ID of the wireless terminal is not included in the base station wireless terminal information table, the terminal is included in the base station wireless terminal information table based on the intermittent parameter included in the message received from the wireless base station control device. An ID entry is added and intermittent parameters are written, and the written intermittent parameters are used.
    The wireless synchronization system according to any one of claims 1 to 5, wherein:
  7. The intermittent parameter further includes a continuous mode end timer timeout value Tc,
    The wireless terminal includes a continuous mode end timer that counts the continuous mode end timer timeout value Tc,
    The continuous mode end timer counts the continuous mode end timer timeout value Tc by the continuous mode end timer every time a predetermined message is transmitted to and received from the radio base station, and the continuous mode end timer times out until the time expires. Configured to transition to continuous mode for continuously receiving messages transmitted from the radio base station,
    The wireless synchronization system according to any one of claims 1 to 6, wherein:
  8. The radio base station includes a continuous mode end timer that counts the continuous mode end timer timeout value Tc in a radio terminal that is a target for transmitting and receiving messages,
    The continuous mode end timer counts the continuous mode end timer time-out value Tc every time a predetermined message is transmitted to and received from the wireless terminal, and the wireless mode is in the period until the continuous mode end timer times out. The terminal is determined to be in continuous mode and configured to continuously send messages to the wireless terminal;
    The wireless synchronization system according to claim 7.
  9. A wireless terminal; a plurality of wireless base stations that are connected to communicate with the wireless terminal; a wireless base station controller that controls one or more wireless base stations; and the wireless terminal that is connected to the wireless base station controller A wireless synchronization method in a wireless synchronization system configured with a database for registering information on intermittent reception operation of
    By the control unit in the wireless terminal,
    Based on preset intermittent parameters, an intermittent reception timing for intermittently receiving a signal transmitted from the radio base station is calculated, and an intermittent reception control procedure for performing an intermittent reception operation according to the intermittent reception timing is performed.
    By the database, a procedure for registering the intermittent parameter set for each wireless terminal in the wireless terminal information table in the database is performed,
    By the control unit in the radio base station control device,
    When sending a message addressed to the wireless terminal,
    A database search request procedure for requesting and receiving transmission of the intermittent parameter related to the wireless terminal to the database;
    A message transmission procedure for generating and transmitting a message including the intermittent parameter received from the database, to a radio base station that subordinates the radio terminal;
    Is done,
    By the control unit in the radio base station,
    When receiving a message addressed to the wireless terminal from the wireless base station controller,
    A transmission timing control procedure for calculating transmission timing for transmitting a message to the wireless terminal based on the intermittent parameter included in the message received from the wireless base station controller;
    A message transmission procedure for generating a message for the wireless terminal and transmitting at a transmission timing calculated by the transmission timing control procedure;
    A wireless synchronization method characterized in that
  10. The intermittent parameters include an intermittent interval time TI and an intermittent offset value Of,
    The wireless synchronization method according to claim 9, wherein the intermittent offset value Of is determined based on a random number less than the intermittent interval time TI.
JP2008230200A 2008-09-08 2008-09-08 Wireless synchronization system and wireless synchronization method Pending JP2010068050A (en)

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WO2012114771A1 (en) * 2011-02-25 2012-08-30 京セラ株式会社 Base station and method for controlling same
JP2012178642A (en) * 2011-02-25 2012-09-13 Kyocera Corp Base station and control method thereof
JP2012178640A (en) * 2011-02-25 2012-09-13 Kyocera Corp Base station and control method thereof
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JP2011009825A (en) * 2009-06-23 2011-01-13 Kenwood Corp Radio repeater and radio communication method
WO2012114771A1 (en) * 2011-02-25 2012-08-30 京セラ株式会社 Base station and method for controlling same
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JP2012178640A (en) * 2011-02-25 2012-09-13 Kyocera Corp Base station and control method thereof
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