JP2000244602A - Method and device for controlling line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a line control method by which physical layer control and data link layer control are realized even between different protocols by transmitting respective pieces of control information to a user station by means of the frame of the protocol on a downstream line, which is different from that used in the user station and executing line control and data link control. SOLUTION: In a center station transmitting/receiving device 4 and a user station transmitting/receiving device 6, ATM is used for a data link layer protocol and TDM is used for a data link layer protocol in the downstream and PPP is used for the data link layer protocol and FDMA is used for the physical layer protocol in an upstream line as a protocol stack in the case of executing line control and data link control. The response of control information of the physical layer data link layer protocol transmitted in the upstream line is received by the data link layer protocol of the downstream line, which is different from that of the upstream line, and control information are extracted so that line control and data link control are executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line control method and a line control device used in a wireless communication system in which a center station and a user station are connected via a wireless line.

[0002]

2. Description of the Related Art Conventional wireless communication is a symmetric communication form in which transmission and reception from a user transmit substantially the same amount of data, such as two-way voice communication and data communication between terminals. There are the following three main communication systems in the physical layer of such wireless communication.

[0003] The first mode is communication using a demand-assigned line assignment system. In this communication, since a plurality of users share and use the wireless band, a user station allocates a line as needed when necessary and performs communication with high line use efficiency. However, since a line is assigned as needed, it takes time for a round trip time (RTT) to perform communication, and communication cannot be started immediately.

[0004] A second form is communication using a random access method. In this communication, a user station randomly selects a channel. This method is effective for packet communication, and line control is easy. However, when communication is performed near the upper limit of the line capacity, there is a problem that signals of a plurality of users compete on the same channel and the frequency of non-transmission increases. .

A third mode is a method of multiplexing and transmitting a plurality of pieces of information in a dedicated line manner. In this method, the bandwidth allocated to information to be transmitted in the line capacity can be freely controlled. The main one is time division multiplexing (TDM), which is used when a large number of calls are aggregated and communicated between stations.

In conventional wireless communication, the above-mentioned communication system has been used in the same system for transmission and reception as shown in FIG. On the other hand, the data link layer is a layer that performs link connection / release / flow control for transmitting network layer information. As for this layer, a standardized method irrespective of the physical layer is generally used.
LC (High Level Data Link Control Procedure) and its derivatives X25. PPP (Point to Point Pro
tocol) or ATM (Asynchronous Transfer Mod)
e) is mainly used. Processing of this layer is performed by dedicated hardware or an OS of a computer, or middleware which is software close to the OS. Since standardized hardware or an OS is used, transmission / reception is performed in the same manner. Is used.

[0007]

According to the information traffic characteristics of the current Internet, a small amount of information such as a data request is transmitted from a user terminal to a server, and a large amount of multimedia information such as a moving image or an image is transmitted from the server. The asymmetric communication for receiving a message is often performed. In the Internet communication, direct communication between user stations is not required due to the characteristic of communication between a server on the Internet and a user station, and communication is performed only with a center station serving as a gateway (GW).

Therefore, in the uplink from the user station to the center station, a configuration is adopted in which many user stations share a plurality of low-speed lines. In that case, communication using a demand assignment line allocation method is effective as a protocol of the physical layer. Among them, a system utilizing frequency division such as a frequency division multiple access system (FDMA) is effective in realizing a low-cost and small-scale device configuration as a user station. Further, since the data link layer is a packet communication and the user station needs a frame with a low overhead for the communication partner, L
APB (Link Access Procedure-Balanced) or SLIP
It is appropriate to use a protocol such as (Serial Line Internet Protocol) or PPP. In addition, when a user station accesses a center station, user authentication for confirming an access right is often performed, and a mechanism for that is required.

On the other hand, in the downlink from the center station to the user stations, the center station collects and transmits information to a plurality of user stations. In that case, TDM is effective as a physical layer protocol as described above. With this method, the center station can allocate a band as needed for each user station. Also, unlike the frequency division multiplexing (FDM), which needs to receive information at a plurality of frequencies, the user station only needs to receive a single frequency, so that the size and cost of the apparatus can be reduced. become. However, it is necessary to filter a packet addressed to a terminal in the own station on a high-speed TDM line. This technology has already been put to practical use in the field of digital broadcasting using a communication satellite, and can provide a general-purpose low-cost one. ATM is a typical data link layer protocol in the field of computer communication.

Therefore, when a wireless communication system for Internet access is realized at low cost, FIG.
As shown in (1), the protocols of the physical layer and the data link layer of the uplink and the downlink have different protocol configurations. In the configuration of FIG. 8, FDMA and an example of a physical layer protocol P _A of the uplink, a protocol HDLC such as an example of the data link layer protocol D _A, since normally exchanging control signals between the same protocol,
There is no means for exchanging control signals between different protocols.

An object of the present invention is to provide a line control method and a line control device capable of realizing physical layer control and data link layer control between different protocols in a wireless communication system for Internet access.

[0012]

According to a first aspect of the present invention, there is provided a line control method comprising the steps of: using different communication protocols for layers below a data link layer and performing communication using a common protocol for a network layer. When the user station and the center station negotiate for each control information of the data link layer, the user station sends to the center station control information for performing line control using the physical layer protocol and control information for performing data link control using the data link layer protocol. The center station transmits each control information to the user station in a frame of a protocol on the downlink different from the protocol used by the user station, and performs line control and data link control.

[0013] In the line control method according to the second aspect and the line control apparatus according to the seventh aspect, the user station transmits each control information to the center station in an uplink physical layer protocol frame and a data link layer protocol frame,
The center station transmits each control information in a control frame using a downlink data link layer protocol to the user station, and the user station filters the control frame marked with a mark directed to its own station, and outputs an information part of the control frame. , And performs line control and data link control by notifying the extracted control information to each of the protocol control units of the physical layer and the data link layer of the uplink.

In the line control method according to the third aspect and the line control apparatus according to the eighth aspect, the user station transmits each control information to the center station in an uplink physical layer protocol frame and a data link layer protocol frame,
The center station encapsulates each control information frame in a control frame using a downlink data link layer protocol different from the uplink and transmits it to the user station.
Filter the control frame marked with a mark addressed to its own station, extract each encapsulated control information frame from the control frame, and send each control information frame to each protocol control unit of the uplink physical layer and data link layer. By notifying, line control and data link control are performed.

In the line control method according to the fourth aspect and the line control apparatus according to the ninth aspect, the user station transmits each control information to the center station in an uplink physical layer protocol frame and a data link layer protocol frame,
The center station transmits to the user station a control information IP packet in which each control information is packetized by a downlink network layer protocol, and the user station filters a packet whose network layer address is addressed to its own station. , And performs line control and data link control by notifying the extracted control information to each of the protocol control units of the physical layer and the data link layer of the uplink.

A line control method according to claim 5 and claim 10.
In the line control device, the user station transmits each control information to the center station in an uplink physical layer protocol frame and a data link layer protocol frame, and the center station transmits each control information frame to the downlink network layer protocol. Control information I encapsulated in
A P packet is transmitted to the user station, and the user station filters packets whose network layer address is addressed to the own station, extracts each encapsulated control information frame from the control information IP packet, and transmits each control information frame. Line control and data link control are performed by notifying the protocol control units of the physical layer and data link layer of the line.

According to a sixth aspect of the present invention, the user station transmits authentication data of the user station by a data link layer protocol, and the center station uses control information of the authentication data in a data link protocol different from that used by the user station. Alternatively, it is encapsulated in a frame of the same network layer protocol as that of the user station and transmitted to the user station to perform management and other control of the user station.

[0018]

FIG. 1 shows an example of a system configuration showing an embodiment of the present invention and an example of communication using different protocol stacks.

In this embodiment, as shown in FIG.
A description will be given based on a system configuration in which a center station 1 and a user station 2 are connected via a satellite line via a communication satellite 3. The center station 1 includes a center station transmitting / receiving device 4 for communicating with the user station 2 and a server 5. The user station 2 includes a user station transmitting / receiving device 6 for communicating with the center station 1 and a user terminal 7.

In the center station transmitting / receiving device 4 and the user station transmitting / receiving device 6, as a protocol stack for performing line control and data link control, the downlink is ATM for the data link layer protocol and TD for the physical layer protocol.
M, and the uplink uses PPP for the data link layer protocol and FDMA for the physical layer protocol. FIG. 1B shows an example of communication in the protocol stack in this case.

Here, the center station 1 and the user station 2
Using a general-purpose data link layer protocol processing device or data link protocol processing software, data link control information such as communication speed setting is transmitted. P
At present, the cost or the device for performing PP control or the like can be reduced by using a general-purpose LSI or software.

In the downlink, a packet destined for the terminal in the local station is filtered by the ATM VPI / VCI on the high-speed TDM line to receive a desired frame. At this time, the response of the control information of the physical layer / data link layer protocol transmitted on the uplink is encapsulated in a downlink data link layer protocol different from the uplink and a network layer protocol common to the uplink and downlink. And control information is extracted from the received information to perform line control and data link control.

(First Embodiment: Claims 1, 2, 7) FIG.
Are the center station transceiver 4 and the user station transceiver 6
1 shows the configuration of the first embodiment.

The receiving process of the center station transmitting / receiving device 4 will be described. When the signal from the user station is received by the FDM interface 41, if the received signal is a data frame, the respective headers are deleted via the FDMA control unit 42 and the PPP control unit 43, and the IP processing unit 44 converts the data into an IP packet. , On the LAN via the LAN interface 45.

On the other hand, FDMA in which the received signal controls the line
In the case of a control frame, line control is performed by the FDMA control unit 42, and in the case of a PPP control frame in which data link control is performed, the PPP control unit 43 performs data link control.
After the line control and the data link control, control information responding to the user station is notified to the OAM cell converter 46. O
In the AM cell converter 46, the VPI / V
In the OAM cell to which CI is added, the FDMA control information or the PPP control information is added to the FDMA and PPP protocol IDs to form an OAM cell, and this control information cell is output to the ATM processing unit 47.

The transmission processing of the center station transmitting / receiving device 4 will be described. When the IP processing unit 44 receives an IP packet from the LAN via the LAN interface 45, the
Output to the M processing unit 47. In the ATM processing unit 47, the received IP packet is converted into an ATM cell by the ATM conversion unit 471, and is ATM-multiplexed together with the control information cell (OAM cell) input from the OAM cell conversion unit 46. Then TD
The data is transmitted on the satellite line by TDM via the M interface 48.

The receiving process of the user station transmitting / receiving device 6 will be described. When the ATM processing unit 62 receives a signal from the center station via the TDM interface 61, the VP
The I / VCI filter 621 selects L from among the received cells.
A cell to which a VPI / VCI addressed to a terminal on the AN is added is filtered. If the received cell is a data cell, the IP conversion unit 622 performs IP conversion, the IP processing unit 63 converts the IP packet into an IP packet, and the LAN interface 6
4 on the LAN.

On the other hand, the received cell is a control information cell (OA).
In the case of (M cells), the data is output from the ATM processing unit 62 to the OAM cell conversion unit 65. In the OAM cell converter 65,
Based on the protocol ID in the information section of the OAM cell, FDMA control information such as channel establishment / release of the uplink and PPP control information such as data link establishment / release are extracted. The extracted FDMA control information or PPP control information is notified to the FDMA control unit 66 or the PPP control unit 67, respectively, and performs line control such as establishment / release of the uplink FDMA line and data link control such as establishment / release of the PPP. .

The transmission process of the user station transmitting / receiving device 6 will be described. The FDMA control unit 66 and the PPP control unit 67
When control information is input from the AM cell converter 65, line control and data link control are respectively performed, and a response frame to the center station is transmitted via the FDM interface 68 onto the satellite line. On the other hand, when the IP processing unit 63 receives a data packet from the LAN via the LAN interface 64, the PPP control unit 67 and the FDMA control unit 6
6 and converted into a PPP frame and an FDMA frame, and transmitted via the FDM interface 68 onto a satellite line.

(Second Embodiment: Claims 1, 3, and 8) FIG.
Are the center station transceiver 4 and the user station transceiver 6
Of the second embodiment is shown. The configurations of the center station transmitting / receiving device 4 and the user station transmitting / receiving device 6 of the present embodiment are the same as those of the first embodiment (FIG. 2).

The difference between the present embodiment and the first embodiment is that, in the reception processing of the center station transmitting / receiving device 4, a signal received from a user station is transmitted by an FDMA control frame or PPP.
In the case of a control frame, the FDMA control unit 42 or PP
The signal notified from the P control unit 43 to the OAM cell conversion unit 46 is a control information frame (a response frame to the user station). In the OAM cell converter 46, this control information frame is encapsulated in an OAM cell to which the VPI / VCI of the transmitting user station is added and output to the ATM processing unit 47.

In the receiving process of the user station transmitting / receiving device 6, if the received cell is a control information cell (OAM cell), the OAM cell conversion section 65 extracts the information section of the OAM cell, thereby providing an uplink line. An FDMA control frame such as establishment / release, and a PPP control frame such as data link establishment / release are extracted. The extracted FDMA control frame is output to the FDMA control unit 66 that performs the physical layer protocol processing of the transmission unit, and the PPP control frame is output to the PPP control unit 67 that performs the PPP control processing.
Each control unit uses the notified control information frame to perform line control such as establishment / release of an uplink FDMA line and PPP.
Data link control such as establishment / release is performed.

If the received signal from the user station is a data frame in the receiving process of the center station transmitting / receiving device 4, if the received signal from the center station is a data cell in the receiving process of the user station transmitting / receiving device 5, The transmission process of the transmission / reception device 4 and the user station transmission / reception device 5 is the first process.
This is the same as the embodiment.

(Third Embodiment: Claims 1, 4, and 9) FIG.
Are the center station transceiver 4 and the user station transceiver 6
3 shows the configuration of the third embodiment. Here, it is assumed that the user station transmitting / receiving device 6 owns its own IP address and can further register the IP address of a terminal on the LAN.

The receiving process of the center station transmitting / receiving device 4 will be described. When the signal from the user station is received by the FDM interface 41, if the received signal is a data frame, the respective headers are deleted via the FDMA control unit 42 and the PPP control unit 43, and the IP processing unit 44 converts the data into an IP packet. , From the IP routing unit 441 via the LAN interface 45 to the LAN.

On the other hand, when the received signal is an FDMA control frame or a PPP control frame, the FDMA control unit 42 and the PPP control unit 43 perform line control and data link control. After the line control and the data link control, control information responding to the user station is notified to the control IP packet converter 49. In the control IP packet conversion unit 49, the process of converting the notified control information into an IP packet is performed by FDM.
Each A / PPP process is distinguished by a UDP port number. Each control information is stored in each processing process as F
Add the port number of the DMA / PPP control process and add
P packetized. In this case, the address added to the IP packet is an address addressed to the user station transmitting / receiving device. This control information IP packet is output to IP processing section 44.

The transmission processing of the center station transmitting / receiving device 4 will be described. When the IP processing unit 44 receives an IP packet from the LAN via the LAN interface 45,
The data is output from the routing unit 441 to the ATM processing unit 47. The ATM processing unit 47 converts the received IP packet into A
The control information is converted into a TM cell, and the control information IP packet input from the control IP packet conversion unit 49 is converted into an ATM cell. The both are ATM multiplexed and transmitted to the satellite line via the TDM interface 48.

The receiving process of the user station transmitting / receiving device 6 will be described. When the ATM processing section 62 receives a signal from the center station via the TDM interface 61, the ATM processing section 62 filters out the cells to which the VPI / VCI destined for the terminal on the LAN is added from the received cells and outputs the filtered cells to the IP processing section 63. I do. IP filtering section 631 of IP processing section 63
Filters the packets addressed to the IP addresses of the user station transmitting / receiving device 6 and the terminals on the LAN from among the received IP packets. Here, the received packet
If the IP address for the above terminal is added,
From the IP routing unit 632 to the LAN interface 6
4 on the LAN.

On the other hand, when the received packet is a control information IP packet addressed to the user station transmitting / receiving apparatus, the packet is output from the IP routing section 632 of the IP processing section 63 to the control IP packet converting section 69. Control IP packet converter 6
9, the process of extracting the FDMA control information and the PPP control information from the control information IP packet is performed by FDMA • PPP.
Each process is distinguished by a UDP port number. The control information IP packet is output to each processing process by a UDP port number. In each process, FDMA control information or PPP control information is extracted from the control information IP packet. Each extracted control information is FD
A notification is sent to the MA control unit 66 or the PPP control unit 67, and line control such as establishment / release of an uplink FDMA line or PPP
Data link control such as establishment / release is performed.

The transmission process of the user station transmitting / receiving device 6 will be described. When receiving the control information from the control IP packet conversion unit 69, the FDMA control unit 66 and the PPP control unit 67 perform line control and data link control in each control unit, and transmit a response frame to the center station via the FDM interface 68. To transmit on a satellite line. On the other hand, when the IP processing unit 63 receives a data packet from the LAN via the LAN interface 64, it outputs the data packet to the PPP control unit 67 and the FDMA control unit 6 to generate a PPP frame / FDM.
The data is converted into an A frame and transmitted on a satellite line via the FDM interface 68.

(Fourth Embodiment: Claims 1, 5, and 10) FIG. 5 shows the configuration of a fourth embodiment of a center station transmitting / receiving apparatus 4 and a user station transmitting / receiving apparatus 6. The configurations of the center station transmitting / receiving device 4 and the user station transmitting / receiving device 6 of the present embodiment are the same as those of the third embodiment (FIG. 4).

The difference between this embodiment and the third embodiment is that, in the reception processing of the center station transmission / reception device 4, a signal received from a user station is transmitted by an FDMA control frame or PPP.
In the case of a control frame, the FDMA control unit 42 or PP
The signal notified from the P control unit 43 to the control IP packet conversion unit 49 is a control information frame (a response frame to the user station). Control IP packet converter 4
9, the process of encapsulating this control information frame in an IP packet is UD for each FDMA / PPP process.
It is distinguished by the P port number. Each control information frame is FDMA-PPP in each processing process.
An IP packet is created by adding the port number of the control process. In this case, the address added to the IP packet is an address addressed to the user station transmitting / receiving device. The control information IP packet encapsulating the control information frame is output to the IP processing unit 44.

In the receiving process of the user station transmitting / receiving device 6, if the received packet is a control information IP packet addressed to the user station transmitting / receiving device, the IP processing unit 63
From the routing unit 632 to the control IP packet conversion unit 6
9 is output. In the control IP packet converter 69, the process of extracting the encapsulated FDMA control frame or PPP control frame from the control information IP packet is performed by F
Each DMA / PPP process is distinguished by a UDP port number. Therefore, the control information IP packet is UDP
Output to each process by port number. Within each process, the FDMA control frame or the PDMA encapsulated by removing the IP header
Extract the PP control frame. Each of the extracted control information frames is notified to the FDMA control unit 66 or the PPP control unit 67, respectively, and performs line control such as establishment / release of the uplink FDMA line and data link control such as establishment / release of the PPP.

When the received signal from the user station is a data frame in the receiving process of the center station transmitting / receiving device 4, the received packet from the center station is received in the receiving process of the user station transmitting / receiving device 5 by the IP address of the terminal on the LAN. If it is added, the transmission processing of the center station transmission / reception device 4 and the user station transmission / reception device 5 is the same as in the second embodiment.

(Fifth Embodiment: Claims 1 and 6) FIG.
A fifth embodiment configuration of the center station transmitting / receiving device 4 and the user station transmitting / receiving device 6 is shown. Here, in the third embodiment or the fourth embodiment, the center station transmission / reception device 4 is provided with the user management unit 50 to register and connect users who can connect to the line.
An example in which management is performed and verification of authentication is performed will be described. Hereinafter, a sequence for performing user authentication will be described.

In a situation where the uplink is disconnected,
When the line control unit 70 of the user station transmitting / receiving device 6 issues a receiving line establishment command from the terminal via the serial interface 71, the line is connected. In this case, the user station transmitting / receiving device 6
Performs the following transmission processing. When the PPP control unit 67 receives the line connection request from the line control unit 70, it starts data link control. The PPP control unit 67 performs authentication control after performing link establishment control. At this time, the authentication information of the user station is converted into a PPP frame and transmitted to the center station via the FDM interface 68.

The center station transmitting / receiving device 4 performs the following processing. When a signal from the user station transmitting / receiving device 6 is received, and the signal is a frame including authentication information, the PPP control unit 43 extracts the authentication information. The user management unit 50 checks the notified authentication information of the user station, determines whether or not the connected user is a registered user, and notifies the PPP control unit 43 of a connection acceptance or connection rejection notification. In the PPP control unit 43, the information notified from the user management unit 50 is transmitted to the control IP.
Notify the packet converter 49. The control IP packet converter 49 converts the received authentication response information into an IP packet in a PPP conversion process. In this case, the address added to the IP packet is an address addressed to the user station transmitting / receiving device 6. This IP packet is sent from the control IP packet converter 49 to the ATM processor 4 via the IP processor 44.
7 to be converted into an ATM cell and transmitted via a TDM interface 48 onto a satellite line.

The user station transmitting / receiving device 6 performs the following processing when receiving a signal from the center station. The signal from the center station received by the TDM interface 61 is an ATM signal.
The processing unit 62 filters the VPI / VCI addressed to the terminal on the LAN, and the IP filtering unit 631 of the IP processing unit 63 extracts the IP address of the user station transmitting / receiving device 6 and the terminal on the LAN from the received IP packets. Packets addressed to are filtered. If the received packet is an IP packet addressed to the user station transceiver 6,
It is output from the P routing unit 632 to the control IP packet conversion unit 69. The control IP packet converter 69 extracts PPP authentication information from the received IP packet and notifies the PPP controller 67 of the information. The PPP control unit 67 performs authentication control based on the notified authentication information. If the received authentication information is a connection acceptance notification, the process proceeds to the next process of the PPP (NCP process). When the received authentication information is a connection rejection notification, the line control unit 70
The connection failure is notified via the serial interface 71.

[0049]

As described above, by using the line control method and the line control device of the present invention, in the communication in the asymmetric network, the optimum physical layer and data link layer for the uplink and the downlink are respectively obtained. Since a protocol configuration can be adopted, the lines can be effectively used.

When considering the protocol configuration, the protocol of the data link layer is standardized, and a general-purpose processor and processing software for this protocol can be obtained. This protocol naturally assumes that the same protocol is used in both directions, and does not consider using different protocols in both directions. However, by using the present invention, such a general-purpose protocol processing device and processing software can be applied to bidirectionally different protocols, so that the cost and size of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is an embodiment of the present invention, (a) is an example of a system configuration,
(b) is a diagram showing an example of communication using different protocol stacks.

FIG. 2 is a block diagram showing the configuration of a first embodiment of a center station transmitting / receiving apparatus 4 and a user station transmitting / receiving apparatus 6.

FIG. 3 is a block diagram showing a configuration of a center station transmitting / receiving apparatus 4 and a user station transmitting / receiving apparatus 6 according to a second embodiment;

FIG. 4 is a block diagram showing the configuration of a third embodiment of a center station transmitting / receiving device 4 and a user station transmitting / receiving device 6.

FIG. 5 is a block diagram showing a fourth embodiment configuration of a center station transmitting / receiving apparatus 4 and a user station transmitting / receiving apparatus 6.

FIG. 6 is a block diagram showing a fifth embodiment configuration of a center station transmitting / receiving apparatus 4 and a user station transmitting / receiving apparatus 6.

FIG. 7 is a view for explaining a conventional line control method (the same system for transmission and reception).

FIG. 8 is a view for explaining communication between different protocols.

[Explanation of symbols]

 Reference Signs List 1 center station 2 user station 3 communication satellite 4 center station transmitting / receiving device 5 server 6 user station transmitting / receiving device 7 user terminal 41 FDM interface (I / F) 42 FDMA control unit 43 PPP control unit 44 IP processing unit 441 IP routing unit 45 LAN Interface (I / F) 46 OAM cell conversion unit 47 ATM processing unit 471 ATM conversion unit 48 TDM interface (I / F) 49 Control IP packet conversion unit 50 User management unit 61 TDM interface (I / F) 62 ATM processing unit 621 VPI / VCI filter 622 IP conversion unit 63 IP processing unit 631 IP filtering unit 632 IP routing unit 64 LAN interface (I / F) 65 OAM cell conversion unit 66 FDMA control unit 67 PPP control unit 68 FDM interface Interface (I / F) 69 IP packet converter for control 70 Line controller 71 Serial interface (I / F)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kohei Ohata 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Nippon Telegraph and Telephone Corporation F-term (reference) 5K034 AA10 CC06 DD02 EE03 EE06 EE10 FF13 HH01 HH02 HH12 HH63 JJ11 JJ24 KK01 KK21 KK27 LL01 SS01

Claims (10)

[Claims] 1. A wireless communication network comprising one center station and a plurality of user stations communicating only with the center station. An uplink from the user station to the center station and an uplink from the center station to the user station. In a configuration in which the downlink uses different communication protocols for layers below the data link layer in the OSI reference model and performs communication using a common protocol for the network layer, the control information of the physical layer and the data link layer is described above. When the user station and the center station negotiate, the user station transmits control information for performing line control using a physical layer protocol and control information for performing data link control using a data link layer protocol to the center station. Is on the downlink different from the protocol used by the user station The frame of the protocol sends each control information to the user station, the line control method and performing line control and data link control. 2. A user station transmits each control information to a center station in a frame of an uplink physical layer protocol and a frame of a data link layer protocol, and the center station transmits the control information to a downlink different from the uplink. A data link layer protocol is used to transmit a control frame over a control frame to a user station.The user station filters a control frame to which a mark directed to the own station is added, and extracts each control information from an information section of the control frame. 2. The line control method according to claim 1, wherein the line control and the data link control are performed by notifying each of the extracted control information to each of the protocol control units of the uplink physical layer and the data link layer. 3. A user station transmits each control information to a center station in an uplink physical layer protocol frame and a data link layer protocol frame, and the center station transmits each control information frame to a downlink different from the uplink. Each of the control information frames encapsulated from the control frame is encapsulated in a control frame by the data link layer protocol and transmitted to the user station. 2. The line control method according to claim 1, wherein the line control and the data link control are performed by extracting each control information frame to each protocol control unit of an uplink physical layer and a data link layer. . 4. The user station transmits each control information to a center station in an uplink physical layer protocol frame and a data link layer protocol frame, and the center station transmits the control information in a downlink network layer protocol. The packetized control information IP packet is transmitted to the user station. In the user station, the network layer address filters the packet addressed to the own station, and the control information IP packet is transmitted.
2. A line control and a data link control are performed by extracting each control information from a packet and notifying the extracted control information to each of a protocol control unit of an uplink physical layer and a data link layer. The line control method described in 1. 5. A user station transmits each control information to a center station in an uplink physical layer protocol frame and a data link layer protocol frame, and the center station transmits each control information frame to a downlink network layer protocol. And transmits a control information IP packet encapsulated in step (a) to the user station. In the user station, a network layer address filters a packet addressed to the own station.
It performs line control and data link control by extracting each control information frame encapsulated from a packet and notifying each control information frame to each protocol control unit of the uplink physical layer and data link layer. 2. The line control method according to claim 1, wherein: 6. The user station transmits authentication data of the user station by a data link layer protocol, and the center station transmits control information of the authentication data to a data link protocol different from that used by the user station or to the same network layer as the user station. 2. The line control method according to claim 1, wherein the control is performed by encapsulating the frame in a protocol frame and transmitting the encapsulated frame to a user station to perform management and other control of the user station. 7. The center station transmits the control information of the physical layer protocol and the control information of the data link layer protocol received from the user station to a control frame by using a control frame of a downlink data link layer protocol different from the uplink to the user station. Means for transmitting, the user station extracts the control information from the information part of the control frame received by the data link layer protocol, and uses the extracted control information to determine each protocol of the uplink physical layer and the data link layer. A line control device comprising a control unit. 8. A center station encapsulates a control information frame of a physical layer protocol and a control information frame of a data link layer protocol received from a user station into a control frame by a data link layer protocol of a downlink different from an uplink. Means for transmitting to the user station, the user station extracts the control information frames encapsulated from the control frames received by the data link layer protocol, and extracts the uplink physical layer and A line control device comprising means for controlling each protocol of a data link layer. 9. The center station transmits to the user station a control information IP packet obtained by packetizing the control information of the physical layer protocol and the control information of the data link layer protocol received from the user station by a downlink network layer protocol. Means for extracting the control information from the control information IP packet received by the network layer protocol, and controlling the uplink physical layer and data link layer protocols with the extracted control information. A line control device, comprising: 10. The center station transmits a control information IP packet obtained by encapsulating a control information frame of a physical layer protocol and a control information frame of a data link layer protocol received from a user station in a downlink network layer protocol to a user station. The user station extracts each of the encapsulated control information frames from a control information IP packet received by a network layer protocol, and uses each of the extracted control information frames as an uplink physical layer and a data link layer. A line control device comprising means for controlling each of the protocols.