JP3082686B2 - MAC bridge control method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple portable telephone system (hereinafter referred to as PHS), a local area network having a wireless section in which a terminal is connected to a server in a wired section via a wireless base station, hereinafter referred to as LAN. , M
The present invention relates to an AC bridge control method.

[0002]

2. Description of the Related Art The above-mentioned LAN MAC (media access control) is based on OSI (open system).
As a sub-layer of the data link layer of the second layer of the interconnection, the standardization of the protocol is being studied internationally by the Institute of Electrical and Electronics Engineers (IEEE) and internationally, and data transmission requests from a plurality of devices are common. It is characterized in that access right control in the event of contention on the transmission line, identification of a physical connection point between the device and the transmission line, frame formation, error control on the transmission line, etc. are performed integrally with the first physical layer. .

A MAC bridge is a device for connecting two LANs A and B having the same MAC in the second layer, and has a fixed address width (a MAC address is also called a hardware address and is 6 octets). (A destination address and a source address for each), so that frames between terminals in each section of the wired side and the wireless side are not forwarded to the other, so that the wired side and the wireless side It has an address filtering function of sequentially transmitting frames between them to the other LAN.

[0004] The IP address is an address individually assigned to each terminal device, and is composed of a 32-bit destination address and a source address, and further includes a network address and a host address as each node. Consists of

[0005] Regarding the control of the MAC bridge in a general LAN, there have been various proposals for a filtering processing method. For example, JP-A-5-22294 discloses a MAC bridge having a learning table.
When connecting LANs with significantly different communication speeds,
In order to prevent the generation of unnecessary traffic from the AN to the low-speed LAN, a LAN table without a refresh function, which indicates the correspondence between the port to which the LAN line is connected and the MAC address, is connected to the WAN line. And a WAN table corresponding to the specified port.
There has been disclosed a MAC bridge control system in which the contents of a LAN table are exchanged with a partner MAC bridge connected to a WAN line connection port and registered in the WAN table at the time of power-on of a C bridge or the like. I have.

Japanese Patent Application Laid-Open No. H5-222295 discloses that a packet having a locally managed MAC address is
Determining means for determining whether the MAC address is globally managed or locally managed by referring to the addressing management method designating bit of the received packet for the purpose of performing a filtering process so that the MAC address is not transferred to the AN; There is disclosed a bridge device including a control unit that performs a filtering process only on a packet having a MAC address that is globally managed based on a determination result.

In a bridge control method of a LAN including a wireless section, when a terminal on the client side is connected via a wireless base station, the server performs authentication from the IP address of the terminal, and the authentication is confirmed. When the MAC
The data communication between the client and the server was controlled by managing addresses and the like.

When a wireless LAN is connected to another network via a wired LAN such as an Ethernet, packets transmitted from the other network are transmitted directly from the Ethernet or the like to a wireless section via a wireless base station. Had been sent out.

[0009]

However, in the conventional control method, the radio base station does not particularly manage the MAC address and the like of the connected terminal. Is unconditionally transmitted to the wireless section, and there is a problem that the frequency use efficiency is reduced.

[0010] Further, there is a problem that the number of received packets for determining whether each terminal is addressed to itself increases and the processing load on each terminal increases.

An object of the present invention is to provide a MAC bridge control system which solves the above-mentioned problems, prevents unnecessary packets transmitted to a wireless section, and reduces the load on a PHS terminal as a client. It is in.

[0012]

According to the MAC bridge control method of the present invention, a terminal of a simple portable telephone system, hereinafter referred to as a PHS, is connected to a server in a wired section via a wireless base station.
In a MAC bridge control method for a local area network having a wireless section to be connected , a wireless base station stores a telephone number of a PHS terminal that has requested connection to a server in a MA.
The server converts the C address into a C address, notifies the server of the MAC address, authenticates the PHS terminal that has requested connection, registers the MAC address of the terminal whose connection has been approved in the MAC address table, and stores information in the MAC address table. the notified to each radio base station, when receiving the packet radio base station from the network, M of the packet
By comparing the AC address information with the MAC address information notified from the server, filtering of a packet transmitted to a wireless section is performed.

The server sends a broadcast signal to the wireless section via the wireless base station at a predetermined cycle,
The MAC address of the responding terminal is compared with the MAC address table held by the server. When a mismatch is detected, the MAC address table is updated, and the updated MAC address information is notified to each wireless base station.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram of one embodiment of the present invention. In this embodiment, a PHS server 31 connected to an Ethernet 40 and a plurality of radio base stations CS21 and CS21 are connected.
2, 23, etc., and a PHS terminal P which is a client that performs data communication while moving within the service area of each wireless base station or across two or more service areas.
S11, 12, 13 and so on. Note that the radio base station C
As for the S and PHS terminals PS, only those necessary for the description are shown, and there may be a radio base station or a PHS terminal other than those shown.

Each radio base station CS21 has a MAC address table converted from the telephone number of the connected terminal PS11 and the like, and holds the MAC address table information received from the server.

The PHS server 31 authenticates the IP address of the terminal PS requested to connect, and
Is connected, the IP address and MAC of the terminal PS
Address and the MAC address table information of the terminal PS is notified to the radio base station CS. That is, P
The HS server 31 determines whether or not a connection request from the terminal PS is connectable based on the IP address table, authenticates the terminal PS, converts the IP address of the terminal whose connection has been approved into a MAC address, and converts the MAC address into a MAC address. And an IP / MAC address management unit that registers the information in the MAC address table to the wireless base station.

In this embodiment, the terminal PS11 exists in the service area of the communication connectable range of the radio base station CS21, and there is no client to be connected in the service area of the radio base station CS22. Station CS23
It is assumed that the terminal PS12 exists in the service area of.

Next, the operation of the embodiment of FIG. 1 will be described with reference to FIG. When the terminal PS as a client, for example, the terminal PS11 performs data communication with the PHS server 31, first, a connection request signal is sent to the radio base station CS21 (sequence a). Upon receiving this connection request signal, the radio base station CS21 sends an authentication request signal to the terminal PS11 (sequence b). The terminal PS11
Upon receiving the authentication request signal, the base station transmits an authentication response signal carrying the telephone number and the IP address information to the radio base station CS2.
1 (sequence c).

The radio base station CS21 converts the telephone number of the terminal PS11 into a MAC address (sequence d), and then sends the IP address and MAC address data of the terminal PS11 to the PHS server 31 (sequence e). As a method of converting the telephone number to the MAC address in this case, the telephone number may be directly expanded into a 6-octet field of the MAC address, or a sequence for generating a certain random pattern is set and generated from the sequence. The first 6 octets are allocated to M of terminal PS11.
It may be an AC address.

The PHS server 31 has a pre-registered I
In contrast to the P address, authentication is performed as to whether the terminal PS11 is connectable (sequence f). If the IP addresses match, authentication is determined to be OK, and an authentication OK signal is sent to the terminal PS11 (sequence g). ) Together with the client terminal P that has accessed the MAC address table
S1 MAC address added and updated, updated MA
The C address table information is stored in each radio base station CS3, CS
4, Notify CS5.

Terminal PS11 which received the signal of authentication OK
Performs data communication with the PHS server 31 as a client (sequence h).

A similar process is performed when another terminal PS12 accesses via the radio base station CS23.

Each radio base station CS21, CS22, CS2
3 are connected terminals PS11, based on the MAC address table information notified from the PHS server 31.
Knowing the MAC address of the PS12 and receiving a packet from another network,
Detects the address and the MAC of the connected terminal PS
When the packet matches the address, the packet data is transmitted to the radio section via the radio base stations CS21, CS22, and CS23.

In this way, the MAC address of the connected client terminal PS is stored in the PHS server 31.
And a bridge function for gating packet data from another network can prevent unnecessary packet data from being transmitted to a wireless section.

An example in which each terminal PS moves from the service area of one radio base station CS to the service area of another radio base station CS will be described with reference to FIG.

In FIG. 2, terminal PS11 moves from radio base station CS21 to the area of radio base station CS22,
Terminal PS in service area of radio base station CS23
Assume that the terminal 12 escapes from the area and the terminal PS13 newly enters the service area of the radio base station CS21.

The server 31 transmits a broadcast signal to the radio base station C at regular intervals in a radio section in order to grasp such a fluctuation situation of the terminal PS under its control.
Via S.

The terminal P in the management area of the server 31
In response to this broadcast signal, S11 and the terminal PS13 return response signals including their own IP addresses and telephone numbers. Each of the wireless base stations CS21 and CS22 receiving these response signals converts the telephone number in the response signal into a MAC address and notifies the server 31 of the conversion.

The server 31 sends a corresponding M to the terminal PS12 that has not responded to the broadcast signal.
The AC address information is deleted from the table, and the responding terminals PS11 and PS13 are processed as follows. That is, even if the terminal PS11 is moved from the radio base station CS21 to the area of the radio base station CS22 and handed over, the IP / MAC address is under the control of the server 31 and is registered. MA
Since there is no change in the C address, it is held as it is, and re-registration of the position is unnecessary. On the other hand, the newly entered terminal PS13
For IP / M
The information of the AC address table is registered and the table is updated. Then, the updated MAC address table information is notified to each radio base station CS.

Each radio base station CS can periodically recognize the connected terminal PS by transmitting a broadcast signal performed by the server 31. Therefore, each wireless base station CS can filter a packet sent from another network by referring to the updated MAC address table, thereby preventing unnecessary packets from being sent to the wireless section. .

[0032]

As described above, according to the present invention, when the server notifies the information of the MAC address table to each wireless base station and receives a packet from the LAN to which the wireless base station is connected, the MAC address of the packet is received. By comparing the information with the MAC address information notified from the server and filtering the packets to be transmitted to the wireless section, it is possible to prevent unnecessary packets from being transmitted to the wireless section.

In addition, each PHS terminal reduces the number of unnecessary packets transmitted to the radio section, and thus has an effect of reducing the processing load for determining which of the received packets is addressed to itself.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

FIG. 2 is a system configuration diagram when a wireless base station CS to which a terminal PS belongs changes.

FIG. 3 is a sequence diagram showing an operation of the embodiment.

[Explanation of symbols]

 11, 12, 13 terminals, PS 21, 22, 23 radio base station, CS 31 PHS server 40 Ethernet (ETHERNET) ah sequence

Continuation of the front page (56) References JP-A-8-102742 (JP, A) JP-A-8-265358 (JP, A) JP-A-8-274804 (JP, A) JP-A-10-41971 (JP, A) JP-A-10-65723 (JP, A) JP-A-10-117207 (JP, A) WO 97/23977 (WO, A2) WO 97/33444 (WO, A2) NTT R & D Vol. 45 No. 11, 1996, Hiroshi Yoshida et al., "Configuration and Control Method of PHS Wireless Packet Communication", page s. 1099-1108 IEICE Technical Report, Vol. 96 No. 254, IN96-69, Takenori Masanori, et al. “Study of PHS packet communication system”, pages. 61-66 1996 IEICE General Conference Lecture Papers, Communications 1, Takeo Ichikawa et al. "Study of Protocol Configuration in PHS Wireless Packets", pages, 491 (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/28 H04L 12/46 H04Q 7/38 JICST file (JOIS)

Claims (3)

(57) [Claims] 1. A terminal of a simple portable telephone system (hereinafter referred to as PHS) is connected to a server in a wired section via a wireless base station.
In a MAC bridge control method for a local area network having a wireless section to be connected, a PHS for which said wireless base station has requested connection to said server
Converts the phone number of the terminal into a MAC address,
The server notifies the server of the C address, the server authenticates the PHS terminal that has requested the connection, registers the MAC address of the terminal whose connection has been approved in the MAC address table, and transmits the information of the MAC address table to each of the wireless terminals. Notifying the base station, when the wireless base station receives a packet from the network, performs filtering of the packet to be transmitted to the wireless section by comparing the MAC address information of the packet with the MAC address information notified from the server. A method for controlling a MAC bridge. 2. A server sends a broadcast signal to a wireless section via a wireless base station at a predetermined cycle, and transmits a MAC address of a PHS terminal responding to the broadcast signal and a MAC address table held by the server. 2. The MAC bridge control according to claim 1, wherein when a mismatch is detected as a result of the comparison of the MAC address table, the MAC address table is updated, and the updated MAC address information is notified to each of the wireless base stations. Method. 3. A terminal of a simple portable telephone system (hereinafter referred to as PHS) is connected to a server in a wired section via a wireless base station.
In a MAC bridge control device for a local area network having a wireless section to be connected , the wireless base station converts a telephone number of a terminal that has requested connection to the server into a MAC address, and the notified MAC address information Means for filtering packets received from the network by the server, the server performs authentication of the terminal that has requested the connection ,
A MAC bridge control device, comprising: means for registering a MAC address of a terminal that has accepted connection in a MAC address table; and means for notifying information of the MAC address table to each of the radio base stations.