WO2014208166A1

WO2014208166A1 - Wireless communication system and communication terminal devices

Info

Publication number: WO2014208166A1
Application number: PCT/JP2014/059244
Authority: WO
Inventors: 石井　崇人
Original assignee: 株式会社日立国際電気
Priority date: 2013-06-28
Filing date: 2014-03-28
Publication date: 2014-12-31
Also published as: JP6086630B2; JPWO2014208166A1

Abstract

Provided are a wireless communication system and communication terminal devices whereby in a case of a power failure occurring due to, for example, a large-scale disaster or the like, in order to prevent occurrence of an event that the communication terminals in charge of the system simultaneously start communications at an opportunity of power restoration and hence the system processing is congested, resulting in a trouble such as system failure, the communication timings of the communication terminal devices can be deconcentrated. A wireless communication system is characterized by performing a control to individually determine communication timings unique to the respective communication terminal devices in the wireless communication system by use of: reference timings referenced to the time commonly recognized by the communication terminal devices existing in the wireless communication network of the wireless communication system; parameters that associate the reference timings with the communication timings of the communication terminal devices in the wireless communication system; and IDs unique to the respective communication terminal devices in the wireless communication system.

Description

Wireless communication system and communication terminal device

The present invention relates to a wireless communication system and a communication terminal device, and more particularly to a communication timing control method in a wireless communication system, and when there is a possibility of performing communication from a plurality of communication terminal devices to a wireless communication network all at once. The present invention relates to a wireless communication system and a communication terminal apparatus that distribute and avoid communication timings from a plurality of communication terminal apparatuses.

For example, a wireless network system (wireless communication system) includes a plurality of wireless communication terminals, and monitors equipment in factories and plants, inventory information such as vending machines, and data on usage meters for power, gas, and water. It is used as a system for collecting by wireless communication. Further, in a wireless communication system, in order to manage data collected via a wireless communication terminal, it may be connected to a server or the like via a wired network.

As a wireless communication terminal used in a wireless communication system, a self-supporting system using a specific low-power radio device or a system using the same public network system as a mobile phone using a wireless data module or the like is used. One network may have several thousand to several tens of thousands of wireless communication terminals.

In a self-employed wireless communication system, wireless communication terminals enter a network via neighboring terminals in an ad hoc manner, and sequentially form a network topology (communication path). Each node (wireless communication terminal) passes traffic to the next node. Multi-hop communication, which performs communication by sequentially transferring (hopping) to the network, can be considered, but transmission delay increases as the number of hops increases, and depending on the arrangement of wireless communication terminals, the traffic load on a specific wireless communication terminal Concentration of data may cause a large delay in data transmission through the terminal, so wireless communication that prevents transmission delay and concentration of traffic load on a specific terminal and that can efficiently operate the entire system A system is provided (see Patent Document 1).

FIG. 11 is a schematic example of a wireless communication system that is an application area of the present invention. In FIG. 11, A01-1 to A01-3 are communication terminal devices such as a power meter and a vending machine having a wireless communication function. A02 is a wireless communication network composed of wireless base stations, exchanges, and the like to which (A01) is connected via a wireless line. A03 is a data server that manages various information from (A01) and distributes various information to (A01). In the wireless communication system which is an application area of the present invention, (A01) is connected to (A02) via a wireless line, and is connected to (A03) via (A02). (A01) reports, for example, electricity meter measurement values and vending machine inventory information to (A03), so that the user of the wireless communication system can calculate the electricity rate and distribute the products sold by the vending machine. Can be operated.

Next, an operation example of the communication terminal device used in the wireless communication system described with reference to FIG. 11 will be described with reference to FIG. FIG. 12 is an operation flow of the communication terminal device in the prior art. After supplying power, the communication terminal performs necessary device initialization processing (ST_B1), searches for nearby wireless base stations for connection to the wireless communication network, and broadcast information from the wireless communication network. Get system information (ST _B2). Here, in the mobile radio communication system, it is necessary to manage the mobile terminal, and the communication terminal apparatus performs location registration for managing the terminal in the network (ST_B3). After the location registration is completed, the process proceeds to normal processing (normal mode) (ST_B4). In normal mode, the communication terminal device detects when it wants to send data from its own device to the server or when it wants to receive data from the server (ST_B5). Wireless link and data link connection (ST_B6) and data communication (ST_B7).

However, in the operation of the conventional communication terminal device shown in FIG. 12, assuming that a power outage occurs over a wide range due to a large-scale disaster or the like and then recovers (power recovery), all operations existing within the recovery range from the power outage are assumed. As power supply to the communication terminal device (A01) is generated all at once, location registration from (A01) to (A02) and (A03) also occurs simultaneously. This will be described with reference to FIG.

JP 2013-055551 A

FIG. 13 shows an operation example of the communication terminal apparatus after power recovery in the prior art. In FIG. 13, SFN stands for System Frame Number, which is a timing serving as a time reference with which the communication terminal devices located in the wireless communication network in the wireless communication system have common recognition. The operation from (ST_B1) to (ST_B3) shown in FIG. 12 is performed almost simultaneously in all the communication terminal devices by the simultaneous power supply to the communication terminal device (A01) existing in the area by power recovery. It will be. In the case of FIG. 13, an example is shown in which location registration is performed simultaneously at the timing of SFN = 3. In such a case, the processing capacity of (A02) and (A03) will be exceeded, congestion will occur, it will affect the area where the power outage did not occur, and there is also a concern that the system may be down. was there.

An object of the present invention is made in view of the problems of the communication terminal device in the above-described conventional technology. For example, a power failure occurs due to a large-scale disaster or the like, and the communication terminal devices under the system are all triggered by power recovery. An object of the present invention is to provide a radio communication system and a communication terminal apparatus capable of distributing communication timings of communication terminal apparatuses in order to prevent communication from starting, system processing being congested, and failure such as system down. And Moreover, it aims at providing the communication timing control method in this radio | wireless communications system and a communication terminal device.

In order to solve the above-described problems, a wireless communication system according to the present invention includes a plurality of communication terminal devices having a wireless communication function, and a server that transmits and receives various information to and from the plurality of communication terminal devices via a wireless communication network. A reference timing based on a time at which communication terminal devices located in the wireless communication network in the wireless communication system have a common recognition, and the reference timing and the wireless communication system Control to determine each communication terminal device-specific communication timing in the wireless communication system using a parameter relating communication timing of the communication terminal device and an ID unique to each communication terminal device in the wireless communication system It is characterized by.

Furthermore, in order to solve the above-described problem, the wireless communication system according to the present invention is the wireless communication system, and the parameter relating the reference timing and the communication timing of each communication terminal device in the wireless communication system is: An arbitrary range in the wireless communication system is defined as a setting area, position information is acquired in the communication terminal apparatus in order to acquire position information of each communication terminal apparatus in the wireless communication system, and position information by each communication terminal apparatus The communication terminal device is associated with which setting area in the wireless communication system, and the associated result is set as the setting area ID in the communication terminal device, and the wireless communication network of the wireless communication system For the communication terminal device with the reference timing and specific setting area ID For each communication terminal apparatus having the relationship with the specific transmission permission timing as area allocation information for each communication terminal apparatus, and the reference timing of the wireless communication network in the wireless communication system and an arbitrary communication terminal apparatus ID. The relationship with specific transmission permission timings is set in the communication terminal apparatus as location registration / transmission start SFN allocation information.

Furthermore, in order to solve the above-described problem, a wireless communication system according to the present invention is the wireless communication system described above, wherein a setting area and a setting area ID in the wireless communication system are determined from a certain area to the wireless communication system. If the number of communication terminal devices that have entered the network exceeds the predetermined number, the setting area is subdivided and the setting area ID is updated and set in the communication terminal device. When the number of communication terminal devices that have entered the wireless communication system from a certain area is less than a predetermined number, the setting area is integrated with other setting areas that are less than the predetermined number. The setting area ID is updated and set in the communication terminal device.

Further, in order to solve the above-described problem, the wireless communication system according to the present invention is the wireless communication system described above, and is configured to cope with area change, area division, or area integration due to movement of the communication terminal device. In the update of the area ID, a location information acquisition unit that acquires location information in the communication terminal device, and a location information transmission unit that transmits the acquired location information to the server, the server stores the transmitted location information. Receiving, updating the setting area to update the setting area ID, transmitting the updated setting area ID, and the communication terminal device receiving this is unique to the communication terminal device based on the updated setting area ID A process of timing control system for updating the communication timing is executed.

Further, in order to solve the above-described problem, a communication terminal apparatus of a wireless communication system according to the present invention is the communication terminal apparatus of the wireless communication system described above, and the transmission permission timing is used for communication of the communication terminal apparatus. The timing control system communication associated with the control system processing and the user data system communication associated with the user data processing are performed, the timing control system communication is performed at the communication timing specific to the communication terminal device, and the user data communication is The wireless communication system is characterized in that communication independent of the communication timing specific to the communication terminal device is enabled by setting from the server.

According to the present invention, it is possible to solve the problems of the communication terminal device in the above-described conventional technology. For example, a power failure occurs due to a large-scale disaster or the like, and communication terminal devices under the system start communication all at once when power is restored. In order to prevent the system processing from being congested and causing a failure such as a system down, it is possible to provide a wireless communication system and a communication terminal device capable of distributing the communication timing of the communication terminal device. Moreover, the communication timing control method of this radio | wireless communications system and a communication terminal device can be provided.

Operation flow at start-up of communication terminal device according to the present invention Operation flow in normal mode of communication terminal device according to the present invention Sequence for location registration / area setting Location registration / transmission start permission area ID concept Example of location registration timing when there is no area ID Example of location registration / transmission start timing when there is an area ID Location registration / transmission start permission area division concept Area management concepts on the server Example of location registration / transmission start timing when location registration permission area is changed Location registration / transmission start permission area integration concept Outline example of wireless communication system to which the present invention is applied Operation flow of communication terminal device in the prior art Example of communication terminal operation after power recovery in the prior art Device information example Setting information example

An embodiment according to the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show an operation flow of the communication terminal apparatus that implements the communication timing control method according to the present invention, and FIG. 3 shows a sequence diagram between the communication terminal apparatus, the wireless communication network, and the server. FIG. 1 is an operation flow at the time of start-up immediately after power supply to the communication terminal apparatus, and FIG. 2 is an operation flow in a normal operation (normal mode).

Embodiment according to the present invention, Part 1: Operation in Startup Mode. First, the operation at startup will be described with reference to FIGS. When power is supplied to the communication terminal device, initialization processing of the communication terminal device itself is executed (ST_101 in FIG. 1). Next, a cell search is performed for a wireless communication network in which the communication terminal device can be located, and system information is acquired from a broadcast channel (ST_102 in FIG. 1). This system information includes, for example, an SFN managed by a wireless communication network, radio parameters specific to the cell, cell identification information, neighboring cell information, location registration timing assignment information for initial system entry, location registration / transmission start SFN assignment Contains information. Next, after confirming the presence / absence of the area ID of the communication terminal device (FIG. 1 ST_103), the location registration start timing is calculated (FIG. 1ST_104).

Here, the calculation procedure of the area ID, the location registration timing allocation information for entering the initial system, the location registration / transmission start SFN allocation information and the location registration start timing according to the present embodiment will be further described with reference to FIGS. I will explain. FIG. 4 shows the concept of SFN and location registration / transmission start permission area ID according to the present invention. As an example, FIG. 4 assumes that the wireless communication network repeats 0 to 4095 as the SFN, but the SFN configuration is shared by the wireless communication network and the wireless communication system. As will be described later, an area ID is assigned to a communication terminal device that implements the present invention depending on its position. If the communication terminal device has never entered the wireless communication system, the area ID is not assigned, but if there is a record of entry, the area ID is assigned. In FIG. 4, SFN 0 to 4095 is divided into four time groups of 0 to 1023, 1024 to 2047, 2048 to 3071, and 3072 to 4095, and each group is further assigned a communication with no area ID assigned. Time zone (#new) that permits location registration of terminal equipment, that is, time zone that permits location registration for initial system entry and location registration / communication terminal equipment location with a specific area ID determined by the system In the example, the transmission is divided into time periods (#a_xx, #b_xx, #c_xx, #d_xx) in which transmission start is permitted. The time zone in which location registration for initial system entry is permitted is known from the location registration timing assignment information for initial system entry in the system information. Here, an example is shown in which the time group is divided on the basis of the SFN. However, if there is a time reference with which the communication terminal apparatus located in the wireless communication network has a common recognition, it may be used. Also, the number of divisions of the time group is arbitrary.

FIG. 5 is an example of position registration timing when there is no area ID. As described above, if the communication terminal device has never entered the wireless communication system, no area ID is given. A communication terminal apparatus without an area ID performs location registration in the time zone “#new” in FIGS. 4 and 5. Furthermore, the communication terminal device according to the present invention performs location registration at a specific timing within the time zone of “#new” using the device ID unique to the terminal device. This will be described in detail. FIG. 5 shows an example in which the time zone “#new” is secured over n frames from SFN 0 to n−1. Also, the communication terminal apparatus according to the present invention operates so that the position registration timing becomes a specific SFN timing using the position registration / transmission start SFN allocation information in the system information described above. For example, if the location registration / transmission start SFN allocation information is “mod 4 (the remainder when the own device ID is divided by“ 4 ”)”, (device ID mod 4 = SFN mod 4) &&#new && is AND Location registration is performed at the following timing. For example, in the case of the device (1), since the device ID is “00000001”, the timing of Δ mark in FIG. 5 that is 00000001 mod 4 = 1, that is, SFN mod = 4 = 1, can be the location registration timing. In the case of the device (2), since the device ID is '12345678', the timing of ▲ mark in FIG. 5 where 12345678 mod 4 = 2, that is, “SFN” mod 4 = 2 can be the timing of location registration.

The position registration timing is calculated according to the procedure as described above, and the position registration is performed when the calculated position registration timing arrives (FIG. 1 ST_105 to ST_106, FIG. 3 PR_301). Actual location registration can be performed at the earliest arrival timing among the calculated location registration timings, or can be performed at the timing after a predetermined delay time has elapsed. The location registration for the wireless communication network is performed by the above procedure.

Next, in the wireless communication system to which the present invention is applied, entry of the communication terminal apparatus into the wireless communication system and establishment of a communication path so that various services can be performed between the communication terminal apparatus and the server via the wireless communication network. I do. It is necessary to transmit apparatus information to the server so that the communication terminal apparatus entering the wireless communication system can be serviced and the server can perform management.

FIG. 14 shows an embodiment of the device information. The device information is device-specific information including the position information of the communication terminal device, and is transmitted from each communication terminal device (A01) to the server (A03) and then stored in the communication terminal device. It is stored in the server as a part of the communication terminal device management information. Detailed operation will be described below. The communication terminal device first establishes a wireless link between the communication terminal and the wireless communication network and a data link between the wireless communication network and the server in order to establish a communication path between the communication terminal device and the server ( FIG. 1 ST_107, FIG. 3PR_302). Next, position positioning is performed in order to obtain position information for transmission with the device information (FIG. 1 ST_108, FIG. 3 PR_303). After obtaining the position information by position measurement, for example, device information as shown in FIG. 14 is created and transmitted to the server (FIG. 1 ST_109, FIG. 3 PR_304).

On the other hand, the server determines the area of the communication terminal device based on the location information in the device information (PR_305 in FIG. 3). For example, an arbitrary area is defined on the server side based on the map information, the position information from the communication terminal device is determined to which area it belongs, and the communication terminal device having the position information is determined. Assign an area ID. For example, taking FIG. 4 as an example, it is determined which area ID corresponds to #a_xx, #b_xx, #c_xx, or #d_xx, and the corresponding area ID is assigned. Then, the server transmits the setting information including the area ID to the communication terminal device (FIG. 3PR_306).

FIG. 15 shows an example of the setting information. The setting information includes settings for devices such as control commands for individual devices, area allocation information to be described later, settings for areas including area IDs, settings for connections including transmission mode, etc., from server (A03) to communication terminal After being transmitted to the device (A01), it is stored together in the server and the communication terminal device.

The communication terminal device receives the setting information from the server (FIG. 1ST_110), holds the area ID in the device, and implements each setting (FIG. 1ST_111, FIG. 3PR_307). The area ID is held by a function that can be held even after the power supply is stopped. Next, the transmission start timing of the own apparatus is calculated based on the set area ID (ST_112 in FIG. 1). A method for calculating the transmission start timing of the own apparatus will be described with reference to FIG.

FIG. 6 shows an example of location registration / transmission start timing when there is an area ID. FIG. 6 shows an example of a device (2) having a device ID: 12345678 and a device (3) having a device ID: 00000004. Also, both devices (2) and (3) are assigned # a_00 as the area ID, and the location registration / transmission start SFN allocation information is “device ID mod 4”. Further, in FIG. 6, among SFN 登録 0 to 1023, the location registration and transmission start are permitted to the communication terminal device assigned the area ID of a_00 in the time zone from SFN m to 1023. In this case, the own device location registration and transmission start timing are (device ID mod 4 = SFN mod 4) &&# a_00. For example, in the case of the device (3), since the device ID is “00000004”, the timing of “Δ” in FIG. 6 where “00000004 mod 4 = 0”, that is, “SFN mod 4 == 0”, can be the timing of location registration and transmission start. In the case of the device (2), since the device ID is '12345678', the timing of ▲ mark in Fig. 6 where 12345678 mod 4 = 2, ie, SFN mod 4 = 2, can be the timing of location registration and transmission start. . The position registration / transmission start timing is calculated according to the procedure as described above, and the process proceeds to the normal process (ST_113 in FIG. 1).

Embodiment 2 of the present invention, 2: Operation of normal mode timing control system Next, normal processing (normal mode) will be described with reference to FIGS. In the normal mode, there are a timing control system process and a user data system process.

In the timing control system processing in the normal mode, the procedure of PR_3000 is periodically executed as shown in FIG. In consideration of the movement of the communication terminal device, etc., position positioning processing is periodically performed to update the position information (FIG. 2ST_201, FIG. 3PR_308), and the device information is updated and created in the same way as at the time of start-up (FIG. 2ST_202). ). Then, it waits for the arrival of the timing calculated by the own device transmission start timing calculation process in FIG. 1 ST_112 (FIG. 2 ST_203), and transmits the device information when the timing arrives (FIG. 2 ST_204, FIG. 3PR_309). In the server, the area determination of the communication terminal apparatus is performed based on the position information in the apparatus information (PR_310 in FIG. 3), and the area ID of the communication terminal apparatus is updated as necessary.

Here, the update of the area ID will be described. For example, the area ID is updated when the communication terminal apparatus physically moves, its position information changes, and moves from # a_00 to # b_00 of the area managed by the server. Alternatively, for example, when the number of communication terminal devices entering the wireless communication system increases from the # a_00 area and exceeds a predetermined number, the area is subdivided. This will be further described with reference to FIGS.

FIG. 7 is a diagram showing the concept of location registration / transmission start permission area division, and FIG. 8 is a diagram showing the concept of area management in the server. On the left side of FIG. 7, devices (1) to (3) exist in # a_00. In addition, the position management status of the communication terminal device of the server at that time is shown on the left side of FIG. In the conceptual diagram of area management in the server of FIG. 8, for example, each device manages a current area ID, a cell connected in a wireless communication network, location information, a device ID, and the like using a table. When the number of terminals entering the wireless communication system increases and exceeds the predetermined number, that is, when the state as shown on the right side of FIG. 7 is reached, area # a_00 is subdivided into # a_00 and # a_01 To do. In the case of the example on the right side of FIG. 7, the device (2), the device n, and the device n + 1 are moved to # a_01 by the re-division, and the server communication as shown on the right side of FIG. This is the status of terminal device location management. The re-division is performed in consideration of the number of terminals belonging to the divided area and the current position of the terminals.

As described above, when the server detects the area movement of the communication terminal device or the area is divided by the server, the area ID of the communication terminal device is updated. Then, the setting information including the updated area ID is transmitted from the server (FIG. 3PR_311). At the same time, the area allocation information defining the correspondence between the SFN and the location registration / transmission start permission timing (for communication terminal devices with known area IDs) is also updated and transmitted from the server. The communication terminal device receives the updated setting information from the server (FIG. 2 ST_205), holds the updated area ID in the device, and implements each setting (FIG. 2 ST_206, FIG. 3 PR_312). Next, based on the area ID that has been updated, the transmission timing of its own apparatus is updated (FIG. 2 ST_207). The update of the own device transmission start timing will be described with reference to FIG.

FIG. 9 shows an example of location registration / transmission start timing when the location registration permission area is changed. FIG. 9 shows an example of a device (2) having a device ID: 12345678 and a device (3) having a device ID: 00000004. In addition, device (3) is assigned # a_00 as an area ID, and device (2) is newly assigned # a_01 as an area ID. The location registration / transmission start SFN allocation information is “device ID mod 4”. Further, in FIG. 9, among SFN 開始 0 to 1023, the time zone from SFN m to l-1 is permitted to register the location and start the transmission to the communication terminal device assigned the area ID of a_00. The location registration and transmission start are permitted to the communication terminal device to which the area ID of a_01 is given during the time period up to. This information can be known from the area allocation information in the setting information transmitted from the server.

In this case, the own device location registration / transmission start timing is (device ID mod 4 = SFN mod 4) &&# a_00 <device with area ID # a_00> (device ID mod 4 = SFN mod 4) &&# a_01 <Device with Area ID # a_01> For example, in the case of the device (3), since the device ID is '00000004' and the area ID is # a_00, 00000004 mod 4 = 0, that is, 'SFN △ mod 4 = 0', the timing of Δ in Fig. 9 is the location registration and transmission It can be the start timing. The timing of SFN = l and SFN = 1020 is a timing at which transmission can be started before the division, but is a timing excluded by the division. In the case of the device (2), since the device ID is '12345678' and the area ID is # a_01, 12345678 mod 4 = 2, that is, SFN mod 4 = 2, the timing of ▲ mark in FIG. 9 indicates the location registration. It can be timing. The timing of SFN = m + 2 is a timing at which transmission can be started before the division, but is a timing excluded by the division. The location registration and transmission start timing are updated by the procedure as described above and applied to the next processing.

As described above, when the number of communication terminal devices entering the wireless communication system increases, the area is re-divided, but when the number of terminals entering the wireless communication system decreases, the areas are integrated. It is also possible. FIG. 10 shows the concept of location registration / transmission start permission area integration. On the left side of FIG. 10, the range formed by Cell I is area # a_00, and the range formed by Cell II is area # a_01. However, as shown in the right side of FIG. In such a situation, areas # a_00 can be defined by integrating the areas and forming the range formed by Cell I and the range formed by Cell II. Thus, the area in the wireless communication system may be independent of the cell of the wireless communication network.

Embodiment 3 of the present invention, Part 3: Operation of normal mode user data system. The operation of the user data system processing in the normal mode will be described using the operation flow of FIG. The user data system processing is performed when the transmission request to the server in the communication apparatus terminal is detected and the data incoming via the wireless communication network (reception request detection) after shifting to the normal mode. When the transmission request and the reception request are detected, the communication terminal apparatus shifts to the user data transmission / reception mode (ST_208). When the mode is shifted to the user data transmission / reception mode, first, it is confirmed whether it is a transmission request or a reception request (ST_209), and in the case of transmission, the transmission mode is confirmed (ST_210).

Here, the transmission mode will be described. The setting information from the server in FIG. 15 includes “transmission mode”. In the transmission mode, a timing control mode operation and a timing non-control mode operation are defined. The timing control mode operation is data transmission at the own device transmission start timing calculated in the control system process ST_207, and the timing non-control mode operation is the own device calculated in the timing control system process ST_207. Data transmission is performed regardless of the transmission start timing. The transmission mode can be determined in consideration of the number of communication terminal apparatuses that have entered the wireless communication system, the number of actually performing communication, and the like. When it is desired to control the transmission timing of each communication terminal device, the timing control mode is selected by the server, and when there is no need to consider the transmission timing of each communication terminal device, the timing non-control mode may be selected. When the timing control mode is designated in ST_210, the device waits for the transmission start timing of its own device (ST_211), performs wireless link and data link connection for data transmission (ST_212), and performs data transmission ( ST_213). When the timing non-control mode is designated in ST_210, the wireless link and the data link connection for data transmission are performed without waiting for the arrival of the transmission start timing of the own device (ST_212), and the data transmission is performed ( ST_213). On the other hand, if there is a reception request in ST_209, a wireless link and data link connection for data reception are performed (ST_214), and data reception is performed (ST_215).

Embodiment according to the present invention, part 4: Operation after power failure / recovery. Next, when power is supplied to the communication terminal device all over a wide area due to a power failure due to a large-scale disaster, etc., then power supply to the communication terminal device is performed all at once by power recovery explain. The communication terminal apparatus that implements the communication timing control method according to the present embodiment is given an area ID if there is a record of entering the wireless communication system. The area ID is held by a function that can be held even after the power supply is stopped. After the power supply is resumed, the operation when the area ID is present is executed in the operation flow shown in FIG. That is, in the location registration start timing calculation process of ST_104, since the area ID, area allocation, and location registration / transmission start SFN allocation information are known, location registration is performed at the timing shown in FIG. The communication terminal device to which the power is supplied performs location registration at each timing based on the area ID and device ID already held by the device itself.

As described above in detail, the communication timing control method according to the embodiment of the present invention can solve the problems in the prior art. This relates to a timing that is a time reference that the communication terminal devices located in the wireless communication network in the wireless communication system have a common recognition, and the reference timing and the communication timing of the communication terminal device in the wireless communication system The communication timing specific to the communication terminal apparatus in the radio communication system is determined using the parameter and the ID unique to the communication terminal apparatus in the radio communication system, and the communication of the communication terminal apparatus in the radio communication system is further determined. The parameter relating timing is defined as an arbitrary range in the wireless communication system as an area, position measurement is performed in the communication terminal device in order to obtain position information of the communication terminal device in the wireless communication system, and the communication terminal Based on the positioning results of the device The communication terminal device is linked to which area in the wireless communication system, the result is set as the area ID in the communication terminal device, the timing serving as a reference for the wireless communication network in the wireless communication system, and a specific area A relationship with a specific transmission permission timing for the communication terminal device having an ID is set in the communication terminal device as area allocation information, and a timing serving as a reference for a wireless communication network in the wireless communication system, and any communication terminal The relationship with the specific transmission permission timing for the communication terminal device having the device ID can be set in the communication terminal device as location registration / transmission start SFN allocation information, and those parameters can be retained even after the power supply is stopped The function is held in the communication terminal device. This prevents power outages due to large-scale disasters, etc., and communication terminal devices under the system start communication all at once when power is restored, causing system processing to become congested and failure such as system down. It is possible to provide a timing control method capable of distributing the communication timing of the communication terminal device.

An embodiment of the present invention relates to a method related to control of communication timing of a communication terminal apparatus in a wireless communication system, and the time reference with which the communication terminal apparatus residing in the wireless communication network in the wireless communication system has a common recognition Communication terminal device in the wireless communication system using the timing to be, the parameter relating the reference timing and the communication timing of the communication terminal device in the wireless communication system, and the ID unique to the communication terminal device in the wireless communication system Provided is a communication timing control method for determining a unique communication timing.

Further, in an embodiment of the present invention, the parameter relating the reference timing and the communication timing of the communication terminal device in the wireless communication system defines an arbitrary range in the wireless communication system as an area, In order to obtain the position information of the communication terminal device, position measurement is performed in the communication terminal device, and the communication terminal device is linked to which area in the wireless communication system based on the position positioning result by the communication terminal device. The result is set in the communication terminal device as an area ID, a timing serving as a reference for the wireless communication network in the wireless communication system, a specific transmission permission timing for the communication terminal device having a specific area ID, Is set in the communication terminal device as area allocation information, and the wireless communication The relationship between the timing used as a reference for the wireless communication network in the system and the specific transmission permission timing for the communication terminal device having an arbitrary communication terminal device ID is stored in the communication terminal device as location registration / transmission start SFN allocation information. Set. And the communication timing control method of being hold | maintained at the said communication terminal device by the function which can be hold | maintained after a power supply stop is provided.

Furthermore, in the embodiment of the present invention, the area and area ID in the wireless communication system increase when the number of the communication terminal devices that have entered the wireless communication system from a certain area exceeds a predetermined number. Takes into account the number of terminals belonging to the divided area and the current position of the terminal, re-divides the area, updates the area ID, sets the communication ID in the communication terminal device, Provides a communication timing control method that integrates the area and updates the area ID and sets it in the communication terminal device when the number of communication terminal devices entering the service area decreases and falls below a predetermined number To do.

Furthermore, in the processing of the communication terminal device in the wireless communication system, the embodiment of the present invention is for area change due to movement of the communication terminal device, area division, update of the area ID to cope with integration, Positioning in the communication terminal device, transmission of the positioning result to the server, area update processing in the server, transmission of the area ID from the area update result from the server, and the wireless by updating the area ID from the server Provided is a communication timing control method in which updating of communication timing unique to a communication terminal apparatus in a communication system is used as a timing control system process, and the timing control system process is periodically performed.

Further, according to an embodiment of the present invention, the communication of the communication terminal apparatus in the wireless communication system includes a timing control system communication associated with the timing control system process and a user data system communication associated with the user data process. With respect to data communication, a communication timing control method is provided that makes it possible to perform communication that does not depend on communication timing specific to a communication terminal device in the wireless communication system by setting from a server in the wireless communication system.

According to the embodiment of the present invention, for example, when considering a communication terminal device in which a wireless communication module is applied to a smart meter or the like, the wireless access by simultaneous access from the smart meter in the recovery operation at the time of power recovery after a wide-area power failure occurs In a case where a high load state is assumed, it is possible to avoid the occurrence of an instantaneous high interference state in addition to the network high load.

Further, in the embodiment of the present invention, in order to prevent a load from being concentrated on a specific wireless communication network constituent device or a cell of the wireless communication network, the location registration permission area is determined as an arrangement of the wireless communication system to which the present invention is applied. Is specified. This is realized, for example, by putting information on the area ID that is permitted to be registered in the broadcast information of the wireless communication network or in individual control information with the communication terminal device. In addition, since there are communication terminal devices to which no area ID is assigned, permission information for registration of communication terminal devices to which no area ID is assigned is also entered. On the other hand, position information (including reference position information) is included in a periodic report from the communication terminal device to the server during normal operation of the wireless communication system. The server manages the area. Further, the communication terminal apparatus is assigned to an arbitrary area based on the position information from the communication terminal apparatus, and an area ID is given. Then, the communication terminal device holds the area ID by a function that can hold the area ID even after the power supply is stopped. Also, the area ID is updated from the server as appropriate by changing the area by moving the communication terminal device or changing the number of accommodated areas. A wireless communication system including these. In the wireless communication system of the present invention, the load distribution of the wireless communication network and the server side processing is performed by performing communication such as location registration at the permitted timing. Further, the communication terminal apparatus has a unique ID, and for example, performs location registration at the timing when the remainder with the value specified by the server with the unique ID matches the remainder with the value specified by the SFN server. If we consider the operation to execute location registration after the terminal-specific delay time has elapsed after power recovery, the timing of location registration and re-entry into the system will be unique for each terminal, which may cause unfairness between terminals. However, according to the present invention, there are terminals with early location registration and terminals with late location registration, but the timing of location registration after power recovery and re-entry into the system is not fixed. Further, according to the present invention, the location registration timing is distributed, so that the load is distributed from the viewpoint of interference. That is, simultaneous access can be avoided in a wireless communication system.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The present invention is particularly suitable for a wireless communication system that enables efficient and stable operation by suppressing concentration of access of wireless communication terminals.

A01 ... Communication terminal device A02 ... Wireless communication network (base station, exchange, etc.) A03 ... Server.

Claims

In a wireless communication system including a plurality of communication terminal devices having a wireless communication function and a server that transmits and receives various types of information via the wireless communication network, the wireless communication in the wireless communication system A reference timing based on a time at which communication terminal devices located in the network have a common recognition, a parameter relating the reference timing to the communication timing of the communication terminal device in the wireless communication system, A radio communication system characterized by performing control to determine each communication timing specific to each communication terminal apparatus in the radio communication system using an ID unique to the communication terminal apparatus.
The wireless communication system according to claim 1, wherein the parameter relating the communication timing of each communication terminal device in the wireless communication system defines an arbitrary range in the wireless communication system as a setting area, In order to obtain the position information of each communication terminal device in the wireless communication system, the communication terminal device acquires position information, and based on the position information by each communication terminal device, each communication terminal device The communication terminal device is associated with whether it exists in the setting area, the association result is set in the communication terminal device as a setting area ID, and the wireless communication network reference timing in the wireless communication system and the specific setting area ID The area allocation information is the relationship with the specific transmission permission timing for Position registration / relationship between the reference timing of the wireless communication network in the wireless communication system and the specific transmission permission timing for the communication terminal device having an arbitrary communication terminal device ID. A wireless communication system, wherein transmission start SFN allocation information is set in a communication terminal apparatus.
3. The wireless communication system according to claim 2, wherein a setting area and a setting area ID in the wireless communication system are determined in advance by an increase in the number of communication terminal devices that have entered the wireless communication system from a certain area. If the predetermined number is exceeded, the setting area is subdivided, the setting area ID is updated and set in the communication terminal apparatus, and the communication terminal that has entered the wireless communication system from a certain area If the number of devices is less than the predetermined number due to the decrease in the number of devices, the setting area ID is updated by integrating the setting area with other setting areas that are less than the predetermined number, and set in the communication terminal device. A wireless communication system.
4. The wireless communication system according to claim 3, wherein position information in the communication terminal apparatus is acquired in updating of a set area ID to cope with area change, area division, or area integration due to movement of the communication terminal apparatus. A location information acquisition unit; and a location information transmission unit that transmits the acquired location information to the server. The server receives the transmitted location information, updates the setting area, and updates the setting area ID. The communication terminal apparatus that has transmitted and received the updated setting area ID executes processing of a timing control system that updates communication timing unique to the communication terminal apparatus based on the updated setting area ID. A wireless communication system.
5. The communication terminal device of the wireless communication system according to claim 1, wherein communication of the communication terminal device includes timing control system communication and user data processing associated with control system processing in which the transmission permission timing is set. User data communication, and timing control communication is performed at a communication timing specific to the communication terminal apparatus, and user data communication is specific to the communication terminal apparatus by setting from the server in the wireless communication system. A communication terminal device that enables communication independent of communication timing.