JPH07322334A - Radio communication system - Google Patents

Abstract

PURPOSE:To provide a radio communication system with less traffic of position management information on a network. CONSTITUTION:A fixed base station 20 investigates whether or not a radio terminal 12 is present inside its own communicable area 80 in the case of receiving data addressed to the radio terminal 12 from the radio terminal 10 and enquires a router 30 for the radio terminal when it is not present. The router 30 for the radio terminal investigates whether or not the radio terminal 12 is present inside the communicable areas 80 and 81 of the fixed base stations 20 and 21 under its management and enquires a position management manager 40 when it is not present. Since the position management of the radio terminal is performed in the separated three hierarchies of the fixed base station, the router for a radio terminal equipment and the position management manager, the traffic of the position management information on the network is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system,
Particularly, when the fixed base station includes a plurality of wireless terminal devices and a plurality of groups of fixed base stations and data from one wireless terminal device is transferred to another wireless terminal device, location management information of the other wireless terminal device is required. And a wireless communication method.

[0002]

2. Description of the Related Art FIGS. 39 and 40 are block diagrams showing a hardware configuration of a conventional wireless communication network. Such a wireless communication network is disclosed in, for example, Japanese Patent Laid-Open No. 3-198496. 39 and 40, the fixed base stations 20 to 23 respectively configure communicable areas 80 to 83 that can be reached by radio, and the wireless terminals 10 to 12 are present therein. Fixed base station 20
23 to 23 are connected to the wired networks 50 and 51, and the wired networks 50 and 51 are connected by the router 60. The wireless terminal 10 is in the communicable area 80 and wirelessly communicates with the fixed base station 20. Wireless terminal 11
Is in the communicable area 81 and performs wireless communication with the fixed base station 20. When the wireless terminal 10 moves to the location of the wireless terminal 11, it is necessary to stop communication with the fixed base station 20 and communicate with the fixed base station 21. When a movable terminal such as a wireless terminal moves in a network connected to it, it is necessary to manage the location of the wireless terminal.

In FIG. 39, location management of all wireless terminals is performed by a location management manager 40 connected to a wired network 50. From wireless terminal 10 to wireless terminal 1
Considering the case of transmitting data to the wireless base station 1, the fixed base station 20 receives the data from the wireless terminal 10, and the fixed base station 20 receives the data.
Determines that it is data to the wireless terminal 11,
The position management manager 40 is inquired about the position information of the wireless terminal 11. The location management manager 40 responds to the fixed base station 20 that the wireless terminal 11 is within the communicable area of the fixed base station 21. The fixed base station 20 uses this information to send the data from the wireless terminal 10 to the fixed base station 21. When the fixed base station 21 receives this data, it transmits it to the wireless terminal 11 in its own communicable area 81.

Further, in FIG. 40, fixed base station 20
23 to 23 manage position information of wireless terminals within their communicable areas 80 to 83. These fixed base stations 20 to 23 are home fixed base stations. The fixed base station 20 manages the position information of all wireless terminals within the communicable area 80. Even when the wireless terminal 10 moves to another communicable area, the location information of the wireless terminal 10 is managed by the home fixed base station 20. Similarly, the other fixed base stations 21 to 23 also manage the position information of all the wireless terminals within their own communicable area and become home fixed base stations for these wireless terminals. Considering the case of transmitting data from the wireless terminal 10 to the wireless terminal 11, the fixed base station 20 receives the data from the wireless terminal 10, and the fixed base station 20 receives the data.
If it is determined that the data is data for 1, the inquiry is made to the fixed base station 21, which is the home base station of the wireless terminal 11. The fixed base station 21 informs the fixed base station 20 of the fact that the wireless terminal 11 is within its own communicable area. if,
If the wireless terminal 11 is within the communication range of another fixed base station, the fact is notified. The fixed base station 20 is the wireless terminal 1
When the response from the home fixed base station 21 of No. 1 is received, the data from the wireless terminal 10 is transmitted according to the information.

[0005]

However, as shown in FIG.
In the wireless communication network shown by, since the location management of the wireless terminal is performed by one location management manager 40, the network 50, the location management information is exchanged between the wireless terminal and the location management manager 40.
There is a drawback that the traffic of 51 increases and a delay occurs in communication of normal user data.

Further, in the wireless communication network shown in FIG. 40, since the fixed base station has the position management information of the wireless terminal, the traffic for exchanging the position management information increases, and the normal user data is transmitted. However, there was a drawback that communication was delayed.

Therefore, a main object of the present invention is to provide a wireless communication system in which the traffic of location management information on the network is small.

[0008]

The wireless communication system of the present invention is capable of performing two-way data communication with a plurality of wireless terminal devices, each of which is movable, and each wireless terminal device within its communicable area. Wireless communication system that includes a plurality of groups of fixed base stations, and that requires position management information of the other wireless terminal device when the data from the certain wireless terminal device is transferred to the other wireless terminal device. In the above, a plurality of wireless terminal device routers, each of which corresponds to the fixed base station group, and a position management device are provided, and the position management information of the wireless terminal devices existing in the communication area of each fixed base station is provided to the fixed base station. Location management information of the wireless terminal devices stored in the fixed base station group within the communicable area of each fixed base station group and stored in the router for wireless terminal device of the fixed base station group, If the location management information is stored in the location management device, and a certain wireless terminal device desires to transmit data to another wireless terminal device, the location management information of the other wireless terminal device is stored by the certain wireless terminal device. When a fixed base station having an existing communicable area is searched and the location management information of the other wireless terminal device is not in the fixed base station, the location management information of the other wireless terminal device belongs to the fixed base station. When the wireless terminal device router of the fixed base station group is searched and the position management information of the other wireless terminal device is not in the wireless terminal router, the position management information of the other wireless terminal device is stored in the position management device. Characterized by searching.

When the location management information of the other wireless terminal device is not in the fixed base station, the location management information of the other wireless terminal device is inquired from the fixed base station to the wireless terminal router. If the search result in the wireless terminal device router is returned from the wireless terminal device router to the fixed base station and the location management information of the other wireless terminal device is not in the wireless terminal device router, The location management information of the wireless terminal device may be inquired from the fixed base station to the location management device, and the search result in the location management device may be returned from the location management device to the fixed base station.

When the location management information of the other wireless terminal device is not in the fixed base station, the location management information of the other wireless terminal device is inquired from the fixed base station to the router for wireless terminal device, When the position management information of the other wireless terminal device is in the wireless terminal device router, the position management information of the other wireless terminal device is returned from the wireless terminal device router to the fixed base station, and the other When the position management information of the wireless terminal device is not in the wireless terminal device router, the position management information of the other wireless terminal device is inquired from the wireless terminal device router to the position management device, and a search in the position management device The result may be returned from the location management device to the fixed base station via the wireless terminal router.

When the location management information of the other wireless terminal device is not in the fixed base station, data addressed to the other wireless terminal device from the certain wireless terminal device is transferred from the fixed base station to the wireless terminal device. When the location management information of the other wireless terminal device is transferred to the other wireless terminal device, the data addressed to the other wireless terminal device is transferred from the wireless terminal device router to the other wireless terminal device. Is transferred to a fixed base station having a communicable area, and if the position management information of the other wireless terminal device is not in the wireless terminal device router, the position management information of the other wireless terminal device is the wireless terminal. An inquiry is made from the device router to the location management device, and a search result in the location management device is returned from the location management device to the wireless terminal device router and addressed to the other wireless terminal device. Data may be transferred to the wireless terminal for a router location management information is stored in the other wireless terminal apparatus from the router for the wireless terminal device.

Also, a plurality of position management devices may be provided.

[0013]

In the wireless communication system according to the present invention, when a certain wireless terminal device desires to transmit data to another wireless terminal device, first, the fixed base station which has received the data from the certain wireless terminal device. In, the location management information of another wireless terminal device is searched. When the location management information is not in the fixed base station, the location management information of another wireless terminal device is searched in the wireless terminal device router of the fixed base station group to which the fixed base station belongs. If the location management information does not exist in the wireless terminal device router, the location management device searches for location management information of another wireless terminal device. As described above, since the position management of the wireless terminal device is performed by dividing into three layers of the fixed base station, the router for wireless terminal device and the position management device, the position management of all the wireless terminal devices is performed by the fixed base station or the position management device. The traffic of the location management information on the network is reduced as compared with the conventional one which is performed in one layer.

Further, when the number of wireless terminal devices is large, a plurality of position management devices can be provided to reduce the operation load of the position management device.

[0015]

【Example】

[Embodiment 1] FIG. 1 is a block diagram showing a hardware configuration of a wireless communication network according to an embodiment of the present invention. Referring to FIG. 1, in this wireless communication network, fixed base stations 20 to 23, a wireless terminal router 30,
31, the location management manager 40 and the host 70
It is connected to the wired networks 50 and 51. The wired networks 50 and 51 are, for example, Ethernet, etc., and the host 70 is a general-purpose personal computer or server connected to the wired networks 50 and 51. The wired networks 50 and 51 are connected by a general-purpose router 60.

The wireless terminal 10 is within the communicable area 80 of the fixed base station 20 and is wirelessly connected to the fixed base station 20 to perform bidirectional communication. The wireless medium includes radio waves and infrared rays. The communicable area 80 is a range in which the fixed base station 20 can perform bidirectional communication with the wireless terminal, and the fixed base stations 21 to 23 similarly have communicable areas 81 to 83. The wireless terminals 10-12 have a particularly unique and immutable address different from the network address of the wired network.
Fixed base stations 20 to 23 and wireless terminal routers 30 and 31,
The network addresses of the location manager 40 and the host 70 are the wired network 50 to which they are connected,
It matches the network address of 51. As a typical address, an IP address of TCP / IP can be assumed. If the router supports TCP / IP, this IP address is used for data routing.

As shown in FIG. 2, the fixed base station 20 is composed of a wired network interface 20a, a transfer module 20b, a location management module 20c and a wireless module 20d, and all wireless terminals existing within its own communicable area. Location management module 20
It is recorded in the memory in c. Other fixed base stations 21-2
3 is also the same.

As shown in FIG. 3, the wireless terminal router 30 is composed of a wired network interface 30a, a transfer module 30b and a position management module 30c, and has addresses of all fixed base stations connected to the wired network to which it is connected. And the addresses of all wireless terminals existing in the communicable area of the fixed base station are recorded in the memory in the position management module 30c. The same applies to the other wireless terminal routers 31.

As shown in FIG. 4, the location management manager 40 comprises a wired network interface 40a and a location management module 40c, and which wireless terminal router manages wireless terminals in all networks, that is, wireless terminals. The information in which router for the wireless terminal records the address of is stored in the memory in the position management module 40c.

In FIG. 1, wireless terminal 10 and wireless terminal 1
When the wireless communication terminal 1 performs communication, the data from the wireless terminal 10 is received by the fixed base station 20 and sent to the wired network 50. At this time, the fixed base station 20 sends the data of the wireless terminal 10 not to the wireless terminal 11 but to the fixed base station 21 in the data format as shown in FIG. This is for showing the network address of the device connected to the wired networks 50 and 51 without showing the address of the wireless terminal to the router 60 connecting between the wired networks 50 and 51. If data flows that makes the address of the wireless terminal visible to the router 60, the router 60 may malfunction in its routing function.

FIG. 7 is a block diagram showing the flow of position management information and data when the wireless terminal 10 carries out bidirectional communication with the wireless terminal 11 in such a wireless communication network, and FIGS. 8 to 17 show such a case. It is a flowchart which shows operation | movement of a wireless communication network. The data from the wireless terminal 10 is wirelessly sent to the fixed base station 20 as shown in FIGS. 7 and 8 (2a, a). The fixed base station 20, as shown in FIGS. 7 and 10, receives the data via the wireless module 20d (2a, a),
When the destination is a wired terminal, the data is sent as it is to the wired network 50 via the wired network interface 20a. When the destination is the wireless terminal 11, first, information on whether or not the wireless terminal 11 is within the communicable area 80 of the wireless terminal 11 is checked using the position management module 20c of the wireless terminal 11 (1a, 1b). Wireless terminal 11
If the wireless terminal 10 is within the communication range 80 of the user,
The data from 1 is transmitted to the wireless terminal 11 as it is using the wireless module 20d (2b, c).

When the wireless terminal 11 is not within the communicable area 80 of the fixed base station 20, the fixed base station 20 is connected to the same wired network 50 and the wireless terminal router 3 is connected.
The address of the fixed base station forming the communicable area in which the wireless terminal 11 exists is queried for 0. This inquiry is sent to the wired network 50 via the wired network interface 20a (1c, a).

The wireless terminal router 30 is shown in FIG. 7 and FIG.
As shown in FIG. 2, this inquiry is received from the wired network 50 via the wired network interface 30a (1c, a), and the location management module 30c is used to check the address of the fixed base station to which the wireless terminal 11 belongs. If the wireless terminal 11 is registered in the location management module 30c, the result is sent to the wired network 50 via the communication network interface 30a (1
d, e).

As shown in FIGS. 7 and 11, the fixed base station 20 finds that the wireless terminal 11 exists within the communicable area of the fixed base station 21 by the response from the wireless terminal router 30 (1d. , E), using the transfer module 20b,
As shown in FIG. 5, the data 90a from the wireless terminal 10 is left unchanged, and the address 90b addressed to the fixed base station 21 is added on top of it.
Is added and sent to the wired network 50. (1c,
F). At this time, the fixed base station 20 has a cache memory in the position management module 20c, and holds information (which fixed base station it belongs to) of the wireless terminal 11 for a certain period of time, so that communication with the wireless terminal 11 thereafter can be performed. The number of inquiries to the wireless terminal router 30 can be reduced.

As shown in FIGS. 7 and 14, when the fixed base station 21 receives this data (2c, f), the fixed base station 21 deletes the destination 90b added by the transfer module 20b in the fixed base station 21 and the remaining data. 90a is transmitted to the wireless terminal 11 using the wireless module 21d (2c, c). In addition, the fixed base station 21 records in the cache memory in the position management module 21c that the data from the wireless terminal 10 has been sent via the fixed base station 20, and holds this for a certain period of time. Upper position management device (local, center) for subsequent communication to the wireless terminal 10
Reduce the number of inquiries to.

The wireless terminal router 30 is shown in FIG. 7 and FIG.
As shown in FIG. 2, regarding the wireless terminal 11 inquired from the fixed base station 20, the location management module 30
When not registered in c (that is, the wireless terminal 11 in FIG.
Is belonging to the fixed base station 22 connected to the wired network 51), the inquiry is made to the location management manager 40 (1e, d).

As shown in FIGS. 7 and 15, the location management manager 40 receives the inquiry from the wireless terminal router 30 via the wired network 50 (1e, d), and manages its own location. The module 40c is used to retrieve the location management information of the wireless terminal 11. Since the location management manager 40 records the information of all wireless terminals, it can always search. The position management manager 40 returns the search result, that is, the wireless terminal router to which the wireless terminal 11 belongs to the wireless terminal router 30 that has inquired via the wireless network 50 (1
f, ko).

The wireless terminal router 30 is shown in FIG. 7 and FIG.
As shown in FIG. 3, when the response from the location management manager 40 is received (1f, ko), this information is recorded in its own location management module 30c and the same information is transmitted to the fixed base station 20 (1g). , Ke).

As shown in FIGS. 7 and 11, when the fixed base station 20 receives this information (1g, i), the fixed base station 20 holds it in the cache memory of its own location management module 20c for a certain period of time, so that the wireless terminal thereafter. The number of inquiries to the wireless terminal router 30 regarding 11 is reduced. Fixed base station 2
0 uses the transfer module 20b according to this information, and as shown in FIG. 6, the data 90a from the wireless terminal 10 is left as it is, and the address 90c addressed to the wireless terminal router 31 is added to the data 90a to establish the wired network 50. It is sent (2e, Ki).

As shown in FIGS. 7 and 16, this data flows to the wired network 51 via the router 60 and is received by the wireless terminal router 31 (2e, K). The wireless terminal router 31 deletes the address 90c added by the transfer module 31b of itself, and when it knows that the data is for the wireless terminal 11, the wireless terminal 11 uses the location management module 31c of the wireless terminal 11. Find out which fixed base station it belongs to. If it is determined that the fixed base station is 22, the wireless terminal router 31 uses the transfer module 31b to add the address of the fixed base station 22 to this data and sends it to the wired network 51 in the data format of FIG. (2f, service).

As shown in FIGS. 7 and 17, when the fixed base station 22 receives this data (2f, service), the transfer module 22b deletes its own address and only the data to the wireless terminal 11 is sent. Take out this wireless module 2
It is sent to the wireless terminal 11 via 2d (2f, Si). Also,
The fixed base station 22 records in the cache memory in the position management module 22c that the data from the wireless terminal 10 is sent via the fixed base station 20, and holds this for a certain period of time. Regarding the communication to the wireless terminal 10, the number of inquiries to the higher position management device (local, center) is reduced.

In this embodiment, the wireless terminals 10-1
The location management of No. 2 is performed by dividing it into three layers of the fixed base stations 20 to 23, the wireless terminal routers 30 and 31, and the location management manager 40. The traffic of the location management information on the wired networks 50 and 51 can be reduced compared to the conventional case.

[Second Embodiment] Next, a wireless communication network according to another embodiment of the present invention will be described. The hardware configuration of the wireless communication network is the same as that shown in the first embodiment. FIG. 18 is a block diagram showing the flow of location management information and data when the wireless terminal 10 performs bidirectional communication with the wireless terminal 11 in the wireless communication network, and FIGS. 19 to 27 show the wireless communication network in that case. It is a flow chart which shows operation. When only the differences from the first embodiment are described, as shown in FIGS. 18 and 21 to 23, when the fixed base station 20 queries the wireless terminal router 30 for information regarding the wireless terminal 11 (S), If the information about the wireless terminal 11 is registered in the wireless terminal router 30, as in the first embodiment, but if the information is not registered, that is, the address of the destination fixed base station is not known. The wireless terminal router 30
Informs the fixed base station 20 to that effect (1d, t). When such a response is received from the wireless terminal router 30, the fixed base station 20 next makes an inquiry to the location management manager 40 (1e, te).

As shown in FIG. 25, when the location management manager 40 receives an inquiry about the wireless terminal 11 from the fixed base station 20 (1e, te), it retrieves information using its own location management module 40c, This result is transmitted to the fixed base station 20 (1f, G).

When the fixed base station 20 receives a response from the location management manager 40 (eg, the wireless terminal 11 belongs to the wireless terminal router 31) (1f, g), this information is sent to its own location management module. Write in the cache memory of 20c. By holding this for a certain period of time, the number of subsequent inquiries to the position management device regarding the wireless terminal 11 is reduced. Using the transfer module 20b, the fixed base station 20 adds the address of the wireless terminal router 31 to the data to the wireless terminal 11 and transmits the data to the wired network 50 (2e, t) as in the first embodiment. The subsequent process is the same as that of the first embodiment.

Also in this embodiment, as in the first embodiment,
The traffic of the location management information on the wired networks 50 and 51 can be reduced as compared with the conventional case.

[Third Embodiment] Next, a wireless communication network according to still another embodiment of the present invention will be described. The hardware configuration of the wireless communication network is the same as that shown in the first embodiment. 28 is a block diagram showing the flow of location management information and data when the wireless terminal 10 performs bidirectional communication with the wireless terminal 11 in the wireless communication network, and FIGS. 29 to 37 show the operation of the wireless communication network in that case. It is a flowchart showing. Wireless terminal 1
If 1 is within the communicable area of the fixed base station 20, the same operation as in the first embodiment is performed. When the wireless terminal 11 is not within the communicable area of the fixed base station 20, the fixed base station 20 receives the data from the wireless terminal 10 as shown in FIGS. The address of the router for transmission is added and transmitted to the wired network 50 (2d, No).

When the wireless terminal router 30 receives this data from the wired network 50 (2d, No), as shown in FIGS. 28 and 32, its own transfer module 3
At 0b, its own data address is deleted, and it is recognized that this is data addressed to the wireless terminal 11. Therefore, first, the location management module 30c is checked whether or not there is information on the wireless terminal 11 (1c). If there is information (1d),
Using this, the transfer module 30b creates data addressed to the fixed base station 21 as shown in FIG. 5 and sends it to the wired network 50 (2g, F). When the fixed base station 21 receives this data, as shown in FIGS. 28 and 34, the first embodiment
Similarly, wirelessly transmits to the wireless terminal 11 (2 g, m).

In the wireless terminal router 30, the wireless terminal 1
If there is no information of 1, the wireless terminal router 30 makes an inquiry to the location management manager 40 (1e,
Hi). The location management manager 40 is shown in FIG. 28 and FIG.
As shown in FIG. 5, the wireless terminal router 30 is replied to which wireless terminal router 30 the wireless terminal 11 belongs (1
f, f). When the wireless terminal router 30 receives this response (for example, information that the wireless terminal 11 belongs to the wireless terminal router 31), the wireless terminal router 30 records it in the cache memory in its own position management module 30c. By holding this for a certain period of time, the number of subsequent inquiries to the position management manager is reduced. The wireless terminal router 30 adds the address of the wireless terminal router 31 to the data from the wireless terminal 10 using the transfer module 30b and sends the data to the wired network 50 (2h, e). As shown in FIGS. 28 and 36, this data passes through the router 60 and the wireless terminal router 3 via the wired network 51.
1 is received (2h, e).

The wireless terminal router 31 transfers this data to the fixed base station 22 as in the first embodiment (2j,
Mi). As shown in FIGS. 28 and 37, when the fixed base station 22 receives this data, the fixed base station 22 deletes its own address in the transfer module 22b and takes out only the data to the wireless terminal 11 via the wireless module 22d. Send to the wireless terminal 11 (2j, mu).

Also in this embodiment, as in the first embodiment,
The traffic of the location management information on the wired networks 50 and 51 can be reduced as compared with the conventional case.

[Fourth Embodiment] FIG. 38 is a block diagram showing a hardware structure of a wireless communication network according to a fourth embodiment of the present invention. In this wireless communication network, the number of wireless terminals is increased in the wireless network shown in the first embodiment, and a plurality of location management managers are used. In this wireless communication network, fixed base stations 20 to 28, wireless terminal routers 30 to 32, and position management managers 40 and 41, as in FIG.
Is connected to the wired networks 50 to 52. A general-purpose router 6 is provided between the wired networks 50 to 52.
They are connected at 0 and 61. Location manager 40
The wireless terminals A to M managed by are represented by shaded ellipses, and the wireless terminals A'to K'managed by the position management manager 41 are represented by shaded ellipses.

The relationship and operation of the wireless terminal, the fixed base station, the wireless terminal router, and the location management manager are almost the same as those in the first to third embodiments.

In FIG. 38, the fixed base station 20 is the wireless terminals A and A ', the fixed base station 21 is the wireless terminals B and C, the fixed base station 22 is the wireless terminals D, B', and C '. Station 2
3 is wireless terminals E, F, D ', fixed base station 24 is wireless terminals G, E', F ', and fixed base station 25 is wireless terminal H,
I, G ', and the fixed base station 26 is connected to the wireless terminals J, K, H'.
The fixed base station 27 manages the wireless terminals L and I ', and the fixed base station 28 manages the wireless terminals M, J', and K '. The wireless terminal router 30 manages the fixed base stations 20 to 22, the wireless terminal router 31 manages the fixed base stations 23 to 25, and the wireless terminal router 32 manages the fixed base stations 26 to 28.

The case where the wireless terminal A communicates with the wireless terminal E will be described according to the first embodiment (FIGS. 7 to 17). The data from the wireless terminal A is received by the fixed base station 20 and its destination is the wireless terminal. When it knows that it is E, it first checks its own location management module. If there is no information on the wireless terminal E, the wireless terminal router 30 is inquired. The wireless terminal router 30 uses its own position management module to check whether the wireless terminal E belongs to the fixed base stations 20 to 22 managed by itself. If the wireless terminal E does not belong to these base stations, the position management manager 40 managing the wireless terminal E is inquired. Location manager 4
0 knows that the wireless terminal E belongs to the wireless terminal router 31, and transmits this information to the wireless terminal router 30. The wireless terminal router 30 transmits this information to the fixed base station 20. The fixed base station 20 transmits data to the wireless terminal router 31 in the data format shown in FIG. The wireless terminal router 31 receives this data,
It is determined that the destination is the wireless terminal E, and the fixed base station 23
Send data to. Upon receiving this data, the fixed base station 23 transfers it to the wireless terminal E.

Similarly, the case where the wireless terminal A communicates with the wireless terminal G'will be described according to the first embodiment. The data from the wireless terminal A is received by the fixed base station 20 and its destination is the wireless terminal G. If it finds that it is', it first checks its location management module. If there is no information on the wireless terminal G ', the wireless terminal router 30 is inquired. The wireless terminal router 30 checks whether or not the wireless terminal G ′ belongs to the fixed base stations 20 to 22 managed by itself, using its own position management module. If the wireless terminal G'does not belong to these base stations, an inquiry is made to the position management manager 41 managing the wireless terminal G '. The position management manager 41 knows that the wireless terminal G ′ belongs to the wireless terminal router 31, and sends this information to the wireless terminal router 30. The wireless terminal router 30 transmits this information to the fixed base station 20. The fixed base station 20 transmits data to the wireless terminal router 31 in the data format shown in FIG. The wireless terminal router 31 receives this data, checks that the destination is the wireless terminal G ′, and transmits the data to the fixed base station 25. The fixed base station 25 is
When this data is received, it is transferred to the wireless terminal G '.

When there are a plurality of location management managers as described above, all wireless terminals are divided into a plurality of location management managers for management. One wireless terminal is managed by one location management manager, and even if the wireless terminal moves, the location management manager does not change. A fixed base station manages all wireless terminals in its wireless cell. Therefore, wireless terminals having different wireless management managers may coexist. The wireless terminal router manages wireless terminals managed by the fixed base station, and thus manages wireless terminals having different location management managers.

In this embodiment, the same effect as that of the first embodiment can be obtained, and since a plurality of position management managers are provided, the operation load of the position management manager can be reduced.

[0049]

As described above, according to the present invention, the position management of the wireless terminal device is performed by dividing it into three layers of the fixed base station, the wireless terminal device router, and the position management device. Can be performed in a network within a limited range as much as possible, traffic of location management information on the network can be reduced, and influence of location management information on user data in the network can be suppressed.

If the number of wireless terminals increases, the
By using multiple location management devices at the center of the hierarchy,
The location management information can be exchanged within the network within a limited range as much as possible, and the operation load of the location management device can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a hardware configuration of a wireless communication network according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a fixed base station of the wireless communication network shown in FIG.

3 is a block diagram showing a configuration of a wireless terminal router of the wireless communication network shown in FIG.

FIG. 4 is a block diagram showing a configuration of a location management manager of the wireless communication network shown in FIG.

FIG. 5 is a diagram showing a data format of a packet addressed to a fixed base station.

FIG. 6 is a diagram showing a data format of a packet addressed to a wireless terminal router.

7 is a block diagram showing a flow of location management information and data in the wireless communication network shown in FIG.

FIG. 8 is a flowchart showing the operation of the wireless communication network shown in FIG. 1, showing the operation of the wireless terminal 10;

FIG. 9 is a flowchart of the operation of the wireless communication network shown in FIG. 1, showing the operation of the wireless terminal 11;

10 is a flow chart showing an operation of the wireless communication network shown in FIG. 1, and is a diagram showing an operation of the fixed base station 20. FIG.

11 is a flow chart showing an operation of the wireless communication network shown in FIG. 1, and is a diagram showing an operation of the fixed base station 20. FIG.

FIG. 12 is a flowchart of the operation of the wireless communication network shown in FIG. 1, showing the operation of the wireless terminal device router 30.

13 is a flowchart showing the operation of the wireless communication network shown in FIG. 1, showing the operation of the wireless terminal device router 30. FIG.

14 is a flow chart showing an operation of the wireless communication network shown in FIG. 1, and is a diagram showing an operation of the fixed base station 21. FIG.

15 is a flow chart showing an operation of the wireless communication network shown in FIG. 1, showing an operation of the location management manager 40. FIG.

16 is a flowchart showing the operation of the wireless communication network shown in FIG. 1, showing the operation of the wireless terminal router 31. FIG.

FIG. 17 is a flowchart showing the operation of the wireless communication network shown in FIG. 1, and is a diagram showing the operation of the fixed base station 22.

FIG. 18 is a block diagram showing a flow of location management information and data in a wireless communication network according to another embodiment of the present invention.

FIG. 19 is a flow chart showing an operation of the wireless communication network shown in FIG. 18, showing an operation of the wireless terminal 10;

20 is a flow chart showing an operation of the wireless communication network shown in FIG. 18, showing an operation of the wireless terminal 11. FIG.

FIG. 21 is a flowchart showing the operation of the wireless communication network shown in FIG.
It is a figure which shows operation | movement.

FIG. 22 is a flowchart showing the operation of the wireless communication network shown in FIG.
It is a figure which shows operation | movement.

23 is a flowchart showing the operation of the wireless communication network shown in FIG. 18, showing the operation of the wireless terminal router 30. FIG.

FIG. 24 is a flowchart showing the operation of the wireless communication network shown in FIG.
It is a figure which shows operation | movement.

FIG. 25 is a flowchart showing the operation of the wireless communication network shown in FIG. 18, showing the operation of the location management manager 40.

26 is a flowchart showing the operation of the wireless communication network shown in FIG. 18, and is a diagram showing the operation of the wireless terminal router 31. FIG.

FIG. 27 is a flowchart showing the operation of the wireless communication network shown in FIG.
It is a figure which shows operation | movement.

FIG. 28 is a block diagram showing a flow of location management information and data in a wireless communication network according to still another embodiment of the present invention.

29 is a flowchart showing the operation of the wireless communication network shown in FIG. 28, and is a view showing the operation of the wireless terminal 10. FIG.

30 is a flow chart showing an operation of the wireless communication network shown in FIG. 28, and is a view showing an operation of the wireless terminal 11. FIG.

31 is a flow chart showing an operation of the wireless communication network shown in FIG.
It is a figure which shows operation | movement.

32 is a flow chart showing the operation of the wireless communication network shown in FIG. 28, and is a view showing the operation of the wireless terminal router 30. FIG.

33 is a flow chart showing the operation of the wireless communication network shown in FIG. 28, and is a view showing the operation of the wireless terminal router 30. FIG.

FIG. 34 is a flowchart showing the operation of the wireless communication network shown in FIG.
It is a figure which shows operation | movement.

35 is a flow chart showing the operation of the wireless communication network shown in FIG. 28, and is a view showing the operation of the location management manager 40. FIG.

FIG. 36 is a flowchart showing the operation of the wireless communication network shown in FIG. 28, and is a view showing the operation of the wireless terminal router 31.

FIG. 37 is a flowchart showing an operation of the wireless communication network shown in FIG. 28, which is a fixed base station 22;
It is a figure which shows operation | movement.

FIG. 38 is a block diagram showing a hardware configuration of a wireless communication network according to still another embodiment of the present invention.

FIG. 39 is a block diagram showing a hardware configuration of a conventional wireless communication network.

FIG. 40 is a block diagram showing a hardware configuration of another conventional wireless communication network.

[Explanation of symbols]

1a to 1g Flow of location management information 2a to 2j Data flow of wireless terminal 10 to 12, A to M, A'to K'Wireless terminal 20 to 28 Fixed base station 20a, 30a, 40a Wired network interface 20b, 30b Transfer Modules 20c, 30c, 40c Location management module 20d Wireless module 30-32 Wireless terminal router 40, 41 Location management manager 50-52 Wired network 60, 61 Router 70 Host 81-83 Communication area 90a-90c Address

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04Q 7/34 H04Q 7/04 C

Claims (5)

[Claims] 1. A plurality of wireless terminal devices, each of which is movable, and a plurality of groups of fixed base stations, each of which is capable of two-way data communication with wireless terminal devices existing within its communicable area. In a wireless communication system that requires location management information of the other wireless terminal device when transferring data from one wireless terminal device to another wireless terminal device, each base station corresponds to the fixed base station group. A plurality of wireless terminal device routers and a position management device are provided, and position management information of wireless terminal devices existing within the communication area of each fixed base station is stored in the fixed base station, and communication of each fixed base station group is performed. The position management information of the wireless terminal devices existing in the feasible area is stored in the wireless terminal device router of the fixed base station group, and the position management information of all the wireless terminal devices is stored in the position management device. When a wireless terminal device desires to transmit data to another wireless terminal device, the location management information of the other wireless terminal device is searched for in a fixed base station having a communicable area in which the certain wireless terminal device exists. When the location management information of the other wireless terminal device is not in the fixed base station, the location management information of the other wireless terminal device is searched for in the wireless terminal device router of the fixed base station group to which the fixed base station belongs. A wireless communication system, wherein when the position management information of the other wireless terminal device is not in the wireless terminal router, the position management information of the other wireless terminal device is searched in the position management device. 2. When the location management information of the other wireless terminal device is not in the fixed base station, the location management information of the other wireless terminal device is queried from the fixed base station to the wireless terminal router. , When the search result in the wireless terminal device router is returned from the wireless terminal device router to the fixed base station, and the location management information of the other wireless terminal device is not in the wireless terminal device router, The location management information of the wireless terminal device is inquired from the fixed base station to the location management device, and the search result in the location management device is returned from the location management device to the fixed base station.
The wireless communication system according to claim 1. 3. When the location management information of the other wireless terminal device is not in the fixed base station, the location management information of the other wireless terminal device is inquired from the fixed base station to the wireless terminal device router. If the location management information of the other wireless terminal device is in the wireless terminal device router, the location management information of the other wireless terminal device is returned from the wireless terminal device router to the fixed base station, If the location management information of the wireless terminal device is not in the wireless terminal device router, the location management information of the other wireless terminal device is inquired from the wireless terminal device router to the location management device, The wireless communication system according to claim 1, wherein the search result is returned from the location management device to the fixed base station via the wireless terminal router. 4. When the location management information of the other wireless terminal device is not in the fixed base station, data addressed to the other wireless terminal device from the certain wireless terminal device is transferred from the fixed base station to the wireless terminal device. When the location management information of the other wireless terminal device is transferred to the wireless router, the data addressed to the other wireless terminal device is transferred from the wireless terminal device router to the other wireless terminal device. Is transferred to a fixed base station having a communicable area, and if the position management information of the other wireless terminal device is not in the wireless terminal device router, the position management information of the other wireless terminal device is the wireless terminal. The router for the device inquires to the position management device, and the search result in the position management device is returned from the position management device to the router for the wireless terminal device, and the data addressed to the other wireless terminal device is returned. Motor, characterized in that is transferred to the wireless terminal device for a router location management information is stored in the wireless terminal for the other wireless terminal apparatus from the router, the wireless communication system according to claim 1. 5. The wireless communication system according to claim 1, wherein a plurality of position management devices are provided.