WO2010012152A1

WO2010012152A1 - Method and equipment for implementing data transmission in wireless network

Info

Publication number: WO2010012152A1
Application number: PCT/CN2009/000658
Authority: WO
Inventors: 温海波
Original assignee: 阿尔卡特朗讯
Priority date: 2008-08-01
Filing date: 2009-06-16
Publication date: 2010-02-04
Also published as: CN101640621A; CN101640621B

Abstract

In order to solve the technical problem that the transmission efficiency of the data transmission between a wireless termination equipment and an access controller is low in the current wireless network because of the overmuch packaging layers, a method for data transmission between an access controller and a wireless termination equipment in the access controller of a wireless network is provided in the present invention, wherein the wireless termination equipment allows one or more wireless local area networks to access it and the access controller and the wireless termination equipment connect on the same second layer network. The method includes: configuring one or more wireless local area network transmission identifications for the wireless termination equipment, wherein different wireless local area network transmission identifications correspond to different wireless local area networks; transmitting a data packet to the wireless termination equipment on the second layer network, wherein the wireless local area network transmission identification included in the data packet is used to denote that the data packet is transmitted to the wireless local area network that the included wireless local area transmission identification corresponds to. The transmission efficiency of data packets between the wireless termination equipment and the access controller in a wireless network can be improved effectively through the invention provided in the present invention.

Description

Method and device for realizing data transmission in wireless network

Technical field

The present invention relates to wireless networks, and more particularly to a method and apparatus for data transmission between a wireless termination device and an access controller in a centralized wireless local area network. Background technique

Under the trend of fixed network and mobile network convergence (FMC, Fixed Mobile Convergence), wireless LAN technology (WLAN, Wireless LAN) will play an important role, especially 802.11 wireless LAN and DSL (Digital Subscribe Line) The combination of technology and network deployment has become one of the preferred solutions for DSL operators to provide more new value-added services (VAS). In Reference 1, the IE WAP (Internet Engineering Task Force) CAP WAP (Control And Provisioning of Wireless Access Points) working group defines a Centralized WLAN architecture, which is currently deployed. One of the preferred schemes for such a wireless network.

In the centralized WLAN architecture shown in FIG. 1, an access node (Access Node) in an access network (NAP) includes an access controller (AC, Access Controller), an access controller, and an or A plurality of wireless termination points (WTPs) are connected, wherein the wireless termination point includes a function of wireless access. Each wireless termination point allows for one or more wireless local area networks (WLANs), each of which contains one or more wireless user terminals. The other end of the access controller in the access node is connected to a network device such as an edge router and, in turn, to a network of one or more Network Service Providers (NSPs).

Under the centralized wireless local area network architecture described above, the CAMWAP protocol (see references 2 and 3) is used for communication between the wireless termination point and the access controller. According to the CAPWAP protocol, the access controller can create one or more WLANs on a wireless termination point, ie when When the access controller and the wireless termination point are connected by one DSL line, multiple WLANs can be created under the same DSL line. In this way, the DSL operator can provide differentiated value-added services through different WLANs, or corresponding different WLANs to different network service providers (NSPs).

In References 2 and 3, the CAPWAP protocol is used for data transmission between the wireless termination device and the access controller, and the transmitted data includes a CAPWAP Control Packet (CAPWAP Control Packet) and a CAPWAP Data Packet (CAPWAP Data Packet). When the CAPWAP protocol communication is performed between the wireless termination device and the access controller through a UDP (User Datagram Protocol) connection, the encapsulation structure of the CAPWAP data packet transmitted between the two is as shown in FIG. 2. The CAPWAP packet is then transmitted through the CAPWAP Data Channel, which is the IP address of the wireless termination point, the data port of the wireless termination point, the IP address of the access controller, and the access control. The data port of the device, as well as the transport layer protocol (UDP protocol or Lightweight User Datagram Protocol UDP-Lite). As shown in Figure 1 and Figure 2, on the one hand, from the uplink data, wireless data frames (such as 802.11 frames) from a certain user terminal of a wireless local area network are sent to the corresponding wireless termination point, and the wireless termination point ^^ According to the current working mode (such as: Local-MAC mode or Split-MAC mode) or convert the received wireless data frame into 802.3 frames, or retain the original wireless data frame (such as 802.11 frame), and then convert the resulting The 802.3 frame or the original wireless data frame plus the CAPWAP header (CAPWAP Header) is used as the user load, and then transmitted through the UDP connection between the wireless termination point and the access controller, that is, the UDP header needs to be added in sequence during transmission. Encapsulation, encapsulation of IP packet headers, and encapsulation of 802.3 headers (802.3 Header). On the other hand, from the downlink data, that is, the wireless data sent from the access controller to the wireless termination point (the final wireless termination point is forwarded to the corresponding user terminal in the corresponding wireless local area network) also needs to go through the above-mentioned encapsulation and access The UDP connection between the controller and the wireless termination point is transmitted.

Therefore, in the existing CAPWAP protocol, when the wireless termination point and the corresponding access controller mutually forward wireless data from or to the user terminal in the corresponding wireless local area network, the wireless data must be layered. Encapsulation, and then transmission through a network connection such as a UDP connection between the wireless termination point and the access controller, resulting in the transmission of wireless data low efficiency. In the case where the bandwidth between the wireless termination point and the access controller is very limited (as if the connection between the two is via DSL), such a data transmission method in the prior art greatly wastes limited network bandwidth.

references

1. "Wireless Access Point Control and Configuration Protocol Architecture Classification" (RFC4118, "Architecture

Taxonomy for Control and Provisioning of Wireless Access Points

(CAPWAP)" ), Yang, L., Zerfos, P. and E. Sadot, June 2005. See http:// www.tools, ietf. org/html/ rfc4118

2. "CAPWAP Protocol Specification", Calhoun, P., March 2008. See

Http://www3^ools. ietf.org/html/draft-ietf-capwap-protocol-specification- 10

3. "CAPWAP Protocol Binding with IEEE802.i l" X "CAPWAP Protocol Binding for IEEE 802.11"), Calhoun, P., February 2008. See

Http://toolsjetf.org/html/draft-ietf-capwap-protocol-binding-ieee80211-0 6

Summary of the invention

In order to solve the above disadvantages in the prior art, the present invention proposes a method for efficient data transmission between an access controller of a wireless network and a wireless termination device, wherein, in actual network deployment, a wireless network is considered. The access controller and the wireless termination device are directly connected through the Layer 2 network in many cases, so the present invention improves the method and apparatus for data transmission between the wireless wireless termination device and the access controller in the wireless network. .

According to a first aspect of the present invention, a method for data transmission between the access controller and a wireless termination device in an access controller of a wireless network is provided, wherein the wireless termination device Allowing one or more WLAN accesses, the access controller and the wireless termination device are connected on the same Layer 2 network, the method comprising the steps of: configuring one or more WLANs to the wireless termination device Transmitting an identifier, wherein one of the one or more wireless local area network transmission identifiers uniquely corresponds to the one One of the one or more wireless local area networks, the different wireless local area network transmission identifiers corresponding to different wireless local area networks; the data packets being transmitted to the wireless termination device on the layer 2 network, wherein the data packets include the one or more One of the wireless local area network transmission identifiers is used to indicate that the data packet is sent to the wireless local area network corresponding to the included wireless local area network transmission identifier.

According to a second aspect of the present invention, a method for data transmission between the wireless termination device and an access controller in a wireless termination device of a wireless network is provided, wherein the wireless termination device allows one or a plurality of wireless local area network accesses, wherein the access controller and the wireless termination device are connected to a same Layer 2 network, the method comprising the steps of: receiving a configuration related to a wireless local area network transmission identifier from the access controller Information, including one or more WLAN transmission identifiers, one of the one or more WLAN transmission identifiers uniquely corresponding to one of the one or more WLANs, different WLAN transmission identifiers corresponding to different Wireless local area network; transmitting a data packet to the access controller on a Layer 2 network, wherein the data packet includes one of the one or more wireless local area network transmission identifiers for indicating that the data packet is from the The one or more wireless local areas corresponding to the included wireless local area network transmission identifier one of the.

According to a third aspect of the present invention, there is provided an apparatus for data transmission between the access controller and a wireless termination device in an access controller of a wireless network, wherein the wireless termination device allows one Or multiple WLAN accesses, the access controller and the wireless termination device are connected on the same Layer 2 network, and the device comprises a transmission identifier sending device and a data packet transceiver device. The transmission identifier sending device is configured to configure one or more wireless local area network transmission identifiers to the wireless termination device, wherein one of the one or more wireless local area network transmission identifiers uniquely corresponds to the one or more wireless local area networks One of the different WLAN transmission identifiers corresponds to a different WLAN; the data packet transceiver is configured to send a data packet to the wireless termination device on the Layer 2 network, wherein the data packet includes the one or more One of the wireless local area network transmission identifiers is used to indicate that the data packet is sent to the wireless local area network corresponding to the included wireless local area network transmission identifier.

According to a fourth aspect of the present invention, a wireless termination device in a wireless network is provided Means for performing data transmission between the wireless termination device and an access controller, wherein the wireless termination device allows one or more wireless local area network access, the access controller and the wireless termination device Connected on the same Layer 2 network, the device includes a transmission identifier receiving device and a data packet transceiver. The transmission identifier receiving apparatus is configured to receive configuration information about the WLAN transmission identifier from the access controller, where the one or more WLAN transmission identifiers are included, and one of the one or more WLAN transmission identifiers Uniquely corresponding to one of the one or more wireless local area networks, different wireless local area network transmission identifiers corresponding to different wireless local area networks; the data packet transceiving device is configured to send data packets to the access controller on the layer 2 network, The data packet includes one of the one or more wireless local area network transmission identifiers for indicating that the data packet is from one of the one or more wireless local area networks corresponding to the included wireless local area network transmission identifier. .

By using the method and apparatus provided by the present invention, when transmitting wireless data from or to a user terminal in a wireless local area network between a wireless termination device and an access controller of a wireless network, the transmission efficiency is improved, thereby improving The utilization of limited bandwidth resources between the wireless termination device and the access controller further improves the operating efficiency of the entire wireless network. DRAWINGS

Other features, objects, and advantages of the present invention will become apparent from the Detailed Description of Description

1 is a schematic diagram of a network topology structure in the prior art;

2 is a schematic structural diagram of a data packet transmitted between a wireless termination device and an access controller in the prior art;

3 is a flow chart of a method for data transmission between a wireless termination device and an access controller in accordance with an embodiment of the present invention;

4a is a schematic structural diagram of a data packet transmitted between a wireless termination device and an access controller according to the present invention (the wireless termination device operates in a local-MAC mode);

4b is a schematic structural diagram of a data packet transmitted between a wireless termination device and an access controller according to the present invention (the wireless termination device operates in a split-MAC mode);

5 is a wireless in an access controller in accordance with an embodiment of the present invention. A block diagram of a device for providing data transmission between the terminating device and the access controller; a block diagram of the device for providing data transmission between the line terminating device and the access controller;

7 is a flow chart of a method of data transmission between a wireless termination device and an access controller in accordance with another embodiment of the present invention;

FIG. 8 is a structural diagram of a wireless local area network transmission identifier according to another embodiment of the present invention; FIG.

9 is a schematic diagram showing the location of a channel mode ("Tunnel Mode") in an "IEEE 802.11 Add WLAN" information element according to another embodiment of the present invention; FIG. 10 is a diagram showing a wireless local area network according to another embodiment of the present invention. The information of the transmission identifier constitutes a map.

In the drawings, the same or similar reference numerals are used to refer to the same or similar device or method steps. detailed description

3 is a flow diagram of a method of data transfer between a wireless termination device and an access controller in accordance with an embodiment of the present invention. The specific embodiment shown in Fig. 3 will be described in detail below with reference to Figs. 4a and 4b.

First, the wireless termination device 31 reports the mode information of the network connection in which it is located to the access controller 41 in step S31. Specifically, the mode information may include information about a network connection between the wireless termination device 31 and the access controller 41. For example, when the wireless termination device 31 and the access controller 41 are connected through an IP network, the specific mode information may be information such as an IP address and a MAC address of the wireless termination device 31. When the wireless termination device 31 and the access controller 41 are connected through other types of networks, the above mode information is related to the type of the particular network connection.

Next, the access controller 41 determines whether the access controller 41 and the wireless termination device 31 are connected to the same Layer 2 network according to the mode information of the network connection reported by the wireless termination device 31. Specifically, if they are connected through an IP network, the access controller 41 can wirelessly terminate the device according to the received mode information. Whether the IP address of 31 and its own IP address are on the same IP subnet, or whether the IP addresses of the two are in the same subnet address segment to determine whether the two are directly connected to the same one. On the second floor network. If it is determined that the two are indeed connected to the same Layer 2 network, the process proceeds to step S33.

In step S33, the access controller 41 transmits the license information containing the relevant data transmission format to the wireless termination device 31 for indicating to the wireless termination device 31 that they are connected on the same layer 2 network, and the Data transmission is performed through the layer 2 network. After receiving the license information, the wireless termination device 31 then performs data transmission between the subsequent access controller 41 directly through the Layer 2 network. It can be understood by those skilled in the art that at this time, in addition to the Layer 2 network transmitting wireless data from or to the user terminal in the relevant wireless local area network, the wireless termination device 31 and the access controller 41 can also transmit through other transmissions. The channel (for example, when the two are connected through an IP network, through a channel such as a UDP connection between the two) transmits other data such as control messages.

Next, the access controller 41 transmits wireless local area network transmission configuration information to the wireless termination device 31 via step S34, including one or more wireless local area network transmission identifiers, each of which corresponds uniquely to the wireless termination device 31. One of the one or more wireless local area networks, the different wireless local area network transmission identifiers correspond to different wireless local area networks. Preferably, after receiving the configuration information, the wireless termination device 31 allocates a wireless local area network transmission identifier obtained from the configuration information for each wireless local area network that has been created or is about to be created under the wireless termination device, different wireless The LAN transmission identifier is used to distinguish between different wireless LANs.

Through the above steps, for any one of the one or more wireless local area networks established under the wireless termination device 31, the wireless termination device 31 and the access controller 41 are marked with the same unique wireless local area network transmission identifier. . In other words, in step S35, if the subsequent wireless termination device 31 is to forward wireless data (for example, an 802.11 frame) from a user terminal of a certain wireless local area network to the access controller 41, the wireless data and the wireless are first used. The WLAN transmission identifier corresponding to the local area network is put into the data packet, and then the data packet is forwarded to the access controller 41 through the Layer 2 network. After receiving the above data packet forwarded by the wireless termination device 31, the access controller 41 The included wireless local area network transmission identifier is obtained from the data packet, so that the wireless data included in the data packet is obtained from which wireless local area network under the wireless termination device 31.

Preferably, the above S33 and S34 can be implemented by extending the control message in the existing CAPWAP protocol.

In addition, since the foregoing data packet including the wireless data and the wireless network transmission identifier directly completes the transmission between the wireless termination device 31 and the access controller 41 through the Layer 2 network, it is possible to reduce a lot of unnecessary compared with the prior art. Packaging process. Specifically, taking the network structure shown in FIG. 1 as an example, the wireless termination device 31 and the access controller 41 are connected through an IP network and connected to the same Layer 2 network, and the wireless local area network.

The wireless local area network transmission identifier corresponding to the WLAN 21 is the VLAN ID 21, and the wireless termination device 31 receives the wireless data sent from the user terminal 11 in the wireless local area network WLAN 21. Further, according to the CAPWAP protocol, the wireless termination device 31 can operate in the Local-MAC. The mode can also work in the Split-MAC mode. Therefore, in the two modes, the data transmission process of the wireless termination device 31 and the access controller 41 in the present invention are respectively described in detail:

The wireless data forwarding process between the wireless termination device 31 and the access controller 41 when the wireless termination device 31 operates in the Local-MAC mode defined by the CAPWAP protocol is: Step 1: The wireless termination device 31 receives the user in the wireless local area network WLAN 21. The wireless data sent by the terminal 11 (for example, when the wireless local area network WLAN 21 is an 802.11 network, the wireless data is specifically an 802.11 frame);

Step 2: The wireless termination device 31 converts the wireless data frame into an 802.3 frame, which includes an 802.3 frame header and three layers of protocol data (IP packets) as a payload;

Step 3: For the data frame that needs to be sent to the access controller, the wireless termination device 31 combines the VLAN ID 21, the 802.3 frame header obtained in step 2, and the three layer protocol data (IP packet) as the payload (Fig. 4a). The 802.3 frame with VLAN ID 21 is shown, and the destination MAC address in the frame header of the 802.3 frame with VLAN ID 21 is modified to the MAC address of the access controller 41.

Step 4: The wireless termination device 31 passes the new 802.3 frame shown in Figure 4a through the second layer. The network is sent to the access controller 41;

Step 5: After receiving the 802.3 frame as shown in FIG. 4a, the access controller 41 extracts the VLAN ID 21 from it, so that the 802.3 frame with the VLAN ID is obtained from the wireless local area network WLAN 21, and at the same time, according to the above-mentioned VLAN ID. The contents of the other parts of the 802.3 frame are processed accordingly or forwarded to other corresponding devices in the network shown in FIG.

In addition, those skilled in the art can understand that, in the downlink direction, the destination wireless local area network where the destination user terminal of the access controller 41 is in the downlink data determines the corresponding wireless local area network transmission identifier, and is formed together with the downlink data as shown in FIG. 4a. The 802.3 frame is shown, and then the downlink data is forwarded to the wireless termination device 31.

Therefore, when the wireless termination device 31 operates in the Local-MAC mode defined by the CAPWAP, the efficiency of wireless data forwarding between the wireless termination device 31 and the access controller 41 is greatly improved by the above-described steps of the present invention.

When the wireless termination device 31 operates in the Split-MAC mode defined by the CAPWAP protocol, the wireless data forwarding process between the wireless termination device 31 and the access controller 41 is: Step 1: The wireless termination device 31 receives the wireless local area network WLAN 21 The wireless data sent by the user terminal 11 (for example, when the wireless local area network WLAN 21 is an 802.11 network, the wireless data is specifically an 802.11 frame (including an 802.11 frame header and an upper layer protocol data packet));

Step 2: The WLAN 21 determines the corresponding WLAN transmission identifier VLAN ID 21, and forms the above-mentioned wireless data (such as 802.11 frame) into an 802.3 frame with VLAN ID 21 (as shown in FIG. 4b), and at the same time, the wireless termination device 31 The MAC address and the MAC of the access controller 41 fill in the header portion of the 802.3 frame with the VLAN ID 21 as the source MAC address and the destination MAC address, respectively;

Step 3: The wireless termination device 31 sends the 802.3 frame shown in Figure 4b to the access controller 41 through the Layer 2 network;

Step 4: After receiving the 802.3 frame as shown in FIG. 4b, the access controller 41 extracts the VLAN ID 21 therefrom, so that the wireless data included in the 802.3 frame with the VLAN ID is obtained from the wireless local area network WLAN 21 corresponding to the VLAN ID 21; , the access controller 41, the wireless included in the payload of the above 802.3 frame with VLAN ID Data (such as 802.11 frames) is converted to a corresponding 802.3 frame, which is processed or forwarded to other corresponding devices in the network shown in FIG.

In addition, it can be understood by those skilled in the art that, in the downlink direction, the destination wireless local area network where the destination user terminal of the access controller 41 is in the downlink data determines the corresponding wireless local area network transmission identifier, and is formed together with the downlink data as shown in FIG. 4b. The 802.3 frame is then forwarded to the wireless termination device 31.

Therefore, when the wireless termination device 31 operates in the split-MAC mode defined by the CAPWAP, the efficiency of wireless data forwarding between the wireless termination device 31 and the access controller 41 is greatly improved by the above-described steps of the present invention.

Preferably, the access controller in the present invention may also be a Digital Subscriber Line Access Multiplexer (DSLAM) for directly controlling one or more wireless termination devices connected thereto.

Figure 5 is a block diagram showing the structure of an apparatus for providing data transmission between a wireless termination device and an access controller in an access controller in accordance with an embodiment of the present invention. The data transmission device 500 includes a connection mode receiving device 501, a license information transmitting device 502, a transmission identification transmitting device 503, and a packet transmitting and receiving device 504. Those skilled in the art, in light of the teachings of the present application, will appreciate that only the transmission identification transmitting device 503 and the data packet transceiving device 504 are necessary to implement the present invention, and other sub-devices are optional devices.

The process of providing wireless data forwarding for the user terminal 12 in the wireless local area network (WLAN ID) corresponding to the wireless local area network WLAN2 is described in detail below with reference to FIG.

First, the connection mode receiving means 501 receives the mode information about the network connection between the access controller and the wireless termination device reported by the wireless termination device 31. When the two are connected through an IP network, the above manner information mainly includes information such as the IP address of the wireless termination device 31.

Next, the license information transmitting means 502 determines whether the access controller 41 and the wireless termination device 31 are connected to the same Layer 2 network according to the received mode information of the network connection. Specifically, if the access controller 41 and the wireless termination device 31 are connected through an IP network, the license information transmitting device 502 can obtain information according to the received manner. Whether the IP address of the wireless termination device 31 and the IP address of the access controller 41 are on the same IP subnet, or whether the IP addresses of the two are in the same subnet address segment to determine whether they are directly between Connected to the same Layer 2 network. If it is determined that the connection is on the same Layer 2 network, the license information transmitting means 502 transmits the license information containing the relevant data transmission format to the wireless termination device 31.

Next, the transmission identifier transmitting means 503 transmits the wireless local area network transmission configuration information to the wireless termination device 31, including one or more wireless local area network transmission identifiers, each of the wireless local area network transmission identifiers uniquely corresponding to one or more established by the wireless termination device 31. One of the wireless local area networks, the different wireless local area network transmission identifiers correspond to different wireless local area networks.

Finally, the packet transceiver 504 transmits and receives data packets on the Layer 2 network between the wireless termination device 31 and the access controller 41. Specifically, when the wireless termination device 31 operates in the Local-MAC mode and the Split-MAC mode defined by the CAPWAP protocol, respectively, the composition of the data packet is as shown in FIG. 4a and FIG. 4b, respectively.

When the wireless termination device 31 operates in the Local-MAC mode, in the uplink direction, after receiving the data packet as shown in FIG. 4a, that is, the 802.3 frame with the wireless LAN transmission identification VLAN ID, the packet transceiver 504 first The VLAN ID 12 is obtained from the 802.3 frame. Since the VLAN ID 12 is the wireless local area network transmission identifier of the wireless local area network WLAN 12 corresponding to the wireless termination device 31, it can be determined that the wireless data contained in the data packet is from the wireless local area network WLAN 12. Secondly, the contents of the other parts of the 802.3 frame with the VLAN ID are processed or forwarded to other corresponding devices in the network shown in Fig. 1. It can be understood by those skilled in the art that, in the downlink direction, when the access controller 41 receives the wireless data sent by the other device in the network as shown in FIG. 1 to the user terminal 12, the packet transceiver 504 firstly Wireless data destination wireless LAN

The WLAN 12 determines its corresponding WLAN transmission identifier VLAN ID12, and then combines the VLAN ID 12 and the above-mentioned wireless data into an 802.3 frame with a VLAN ID as shown in FIG. 4a, and at the same time, the source MAC address and the destination MAC of the Header portion of the 802.3 frame. The addresses are respectively designated as the MAC address of the access controller 41 and the MAC address of the user terminal 12, and then the newly composed 802.3 frame is transmitted to the wireless termination device 31. When the wireless termination device 31 operates in the Split-MAC mode, in the uplink direction, the packet transceiver 504 receives the data packet as shown in FIG. 4b, that is, the wireless local area network transmission identification VLAN ID and the original format wireless data ( After the 802.3 frame of the 802.11 frame), it first obtains the VLAN ID 12 from it. Since the VLAN ID 12 is the wireless local area network transmission identifier of the wireless local area network WLAN 12 corresponding to the wireless termination device 31, the wireless data contained in the data packet can be determined. From the wireless LAN WLAN 12. Secondly, the original format wireless data (such as 802.11 frame) included in the above 802.3 frame with VLAN ID is converted into a new 802.3 frame, and the new 802.3 frame is sent to other corresponding devices in the network shown in FIG. . It can be understood by those skilled in the art that, in the downlink direction, when the access controller 41 receives the wireless data sent by the other device in the network as shown in FIG. 1 to the user terminal 12, the packet transceiver 504 firstly The purpose of the wireless data WLAN 12 determines its corresponding WLAN transmission identification VLAN ID 12, and then converts the downlink wireless data into a wireless data frame of the original format (such as an 802.11 frame), and then the VLAN ID 12 and the wireless data of the original format described above. The frame is composed of an 802.3 frame with a VLAN ID as shown in FIG. 4a, and the source MAC address and the destination MAC address of the Header portion of the 802.3 frame are respectively designated as the MAC address of the access controller 41 and the MAC address of the wireless termination device 31. Then, the newly composed 802.3 frame is transmitted to the wireless termination device 31.

6 is a block diagram showing the structure of an apparatus for providing data transmission between a wireless termination device and an access controller in a wireless termination device in accordance with an embodiment of the present invention. The data transmission device 600 includes a connection mode transmitting device 601, a license information receiving device 602, a transmission flag receiving device 603, and a packet transceiver device 604. Those skilled in the art will appreciate from the teachings of the present application that only the transmission identification receiving device 603 and the data packet transceiver 604 are necessary to implement the present invention, and other sub-devices are optional.

First, the connection mode transmitting device 601 reports the mode information about the network connection between the access controller and the wireless termination device of the wireless termination device 31 to the access controller 41. When the two are connected through an IP network, the above information mainly includes wireless termination. Prepare 31 IP address and other information.

Next, the license information receiving device 602 receives the license information from the access controller 41 containing the relevant data transfer format. If the permission information includes an indication that the wireless termination device 31 and the access controller 41 can directly send and receive data packets through the Layer 2 network between the two, the data packet transceiver 604 is instructed to directly send and receive data through the Layer 2 network. package.

Next, the transmission identifier receiving device 603 receives the wireless local area network transmission configuration information sent from the access controller 41, including one or more wireless local area network transmission identifiers, each of which is uniquely associated with the wireless termination device 31. One of the one or more wireless local area networks, the different wireless local area network transmission identifiers correspond to different wireless local area networks.

Finally, the packet transceiver 604 transmits and receives data packets on the Layer 2 network between the wireless termination device 31 and the access controller 41. Specifically, when the wireless termination device 31 operates in the Local-MAC mode and the Split-MAC mode defined by the CAPWAP protocol, respectively, the composition of the data packet is as shown in FIG. 4a and FIG. 4b, respectively.

When the wireless termination device 31 is operating in the Local-MAC mode, in the downstream direction, after receiving the data packet as shown in FIG. 4a, that is, the 802.3 frame with the wireless LAN transmission identification VLAN ID, the packet transceiver 604 first The VLAN ID 12 is obtained in the 802.3 frame. Since the VLAN ID 12 is the wireless local area network transmission identifier of the wireless local area network WLAN 12 corresponding to the wireless termination device 31, it can be determined that the wireless data contained in the data packet is to be sent to the wireless local area network WLAN 12. Secondly, according to the above 802.3 frame with VLAN ID, it is converted into a corresponding 802.11 frame and forwarded to the wireless local area network WLAN12. It can be understood by those skilled in the art that, in the uplink direction, when the wireless termination device 31 receives the wireless data from the user terminal 12 in the wireless local area network WLAN 12, the packet transceiver 604 first determines the corresponding wireless according to the wireless local area network WLAN 12. The LAN transmission identifier VLAN ID12 converts the received wireless data (ie, 802.11 frame) into 802.3 frames and forms the 802.3 frame with the VLAN ID as shown in FIG. 4a with the VLAN ID 12, and the source MAC of the Header portion of the 802.3 frame. The address and destination MAC address are respectively designated as the MAC address of the user terminal 12 and the MAC address of the access controller 41, and then the newly formed 802.3 frame is transmitted to the access controller 41. When the wireless termination device 31 is operating in the Split-MAC mode, in the downlink direction, the packet transceiver 604 receives the data packet as shown in FIG. 4b, that is, the wireless LAN transmits the identification VLAN ID and the original format of the wireless data (eg, After the 802.3 frame of the 802.11 frame), it first obtains the VLAN ID 12 from it. Since the VLAN ID 12 is the wireless local area network transmission identifier of the wireless local area network WLAN 12 corresponding to the wireless termination device 31, it can be determined that the wireless data contained in the data packet is to be Send to WLAN 12 on the wireless LAN. Next, the original format wireless data (such as 802.11 frame) included in the above 802.3 frame with VLAN ID is sent to the wireless local area network WLAN 12. It will be understood by those skilled in the art that, in the uplink direction, when the wireless termination device 31 receives the wireless data (such as an 802.11 frame) in the original format from the user terminal 12, the packet transceiver 604 first according to the user terminal.

ID 12, and then the VLAN ID 12 is combined with the received original format wireless data to form an 802.3 frame with a VLAN ID as shown in FIG. 4b, and the source MAC address and the destination MAC address of the Header portion of the 802.3 frame are respectively designated. To wirelessly terminate the MAC address of the device 31 and the MAC address of the access controller 41, the newly formed 802.3 frame is then transmitted to the access controller 41.

Figure 7 is a flow chart showing a method of data transfer between a wireless termination device and an access controller in accordance with another embodiment of the present invention. The specific embodiment shown in Fig. 7 will be described in detail below with reference to Fig. 1.

As mentioned above, in references 2 and 3, the CAPWAP protocol is used for data transmission between the wireless termination device and the access controller, wherein the transmitted data includes

CAPWAP control packet and CAPWAP packet. When the CAPWAP protocol communication is performed between the wireless termination device and the access controller through the UDP connection, the encapsulation structure of the CAPWAP data packet transmitted between the two is as shown in FIG. 2 . With the technical solution of the present invention, when the wireless termination device 31 and the access controller 41 are connected to the same Layer 2 network, the CAPWAP data packet can be directly transmitted through the Layer 2 network, thereby reducing unnecessary packaging processes and improving transmission efficiency. . The CAPWAP protocol carries out the necessary extensions. These extensions include: 1) Based on the three tunnel modes (802.3 frame tunnel mode, native frame tunnel mode, and local bridging) between the wireless termination device and the access controller defined by the existing CAPWAP protocol, the extension defines Simple Tunnel mode. When the Simple Tunnel mode is negotiated between the wireless termination device 31 and the access controller 41, the subsequent CAPWAP data packets are directly transmitted through the Layer 2 network. That is, the WTP Frame Tunnel Mode information element (Information Element) in the existing CAPWAP protocol is extended. When the value is 8, the Simple Tunnel mode is indicated.

2) Define a new WLAN transmission identification information element, which is used to indicate the WLAN transmission identifier used in the present invention, and is named as a VLAN ID, and the transmission identifier specifically includes an 8-bit wireless ID (Radio ID), 8-bit wireless LAN ID (WLAN ID) and a 16-bit virtual network information (VLAN)

Information ), as shown in Figure 8. The wireless local area network transmission identifier represented by the information element uniquely corresponds to a wireless local area network established by a wireless termination device, and different wireless local area network transmission identifiers correspond to different wireless local area networks.

3) Expand the definition of "IEEE 802.11 Add WLAN" in Reference 3 (as shown in Figure 9), where the information element "Tunnel Mode" takes a value of 3 (in Reference 3, the value range of Tunnel Mode is 0, 1, 2), indicating that the access controller 41 instructs the wireless local area network created by the wireless termination device 31, and indicates that the CAPWAP data packet from or to the wireless local area network is forwarded between the access controller 41 and the wireless termination device 31. The Simple Tunnel mode will be used.

The method for data transmission between the wireless termination device 31 and the access controller 41 of another embodiment of the present invention will be described in detail below with reference to FIG. 7 and the CAPWAP protocol after the above extension.

In step S71, the wireless termination device 31 sends a Discovery Request request message to the access controller 41 for determining whether the access controller 41 can provide services for it. The request message includes a WTP Frame Tunnel Mode information element, and a value of 8, indicating that the wireless termination device 31 supports the Simple Tunnel mode.

In step S72, the access controller 41 returns a Discovery to the wireless termination device 31. The Response response message is used to indicate that the access controller 41 will provide services for the wireless termination device 31 in a subsequent process. When the access controller 41 determines that the wireless termination device 31 is connected to the same Layer 2 network, it indicates to the wireless termination device 31 that subsequent CAPWAP data packets will be transmitted directly through the Layer 2 network.

Preferably, the wireless termination device can simultaneously transmit the mode information of the network connection such as the IP address of the wireless termination device 31 to the access controller 41 in the step S71.

Next, in step S73, according to the existing CAPWAP protocol, a UDP connection or a DTLS connection is established between the wireless termination device 31 and the access controller 41.

(Datagram Transport Layer Security, Data Transfer Layer Security). It should be noted that the CAPWAP control packet between the wireless termination device 31 and the access controller 41 is still transmitted through the above UDP connection or DTLS connection.

Next, in step S74 and step S75, the wireless termination device 31 requests the access controller 41 to provide the service through the CAPWAP control message CAPWAP Join Request, and the access controller 41 also returns a CAPWAP control message to the wireless termination device 31.

CAPWAP Join Response. Preferably, in the CAPWAP Join Request message, the wireless termination device 31 can also indicate that it has the processing capability of supporting the Simple Tunnel mode; in the CAPWAP Join Response message, the Simple Tunnel mode is Transfer CAPWAP packets between the two.

In step S76, related configuration information is exchanged between the wireless termination device 31 and the access controller 41 through the WTP Configuration procedure.

Subsequently, the access controller 41 transmits an IEEE 802.11 WLAN Configuration Request configuration request message to the wireless termination device 31 via step S77, including the extended definition of the wireless local area network transmission identification information element, and the extended definition "IEEE 802.11 Add WLAN". , the latter contains "Tunnel Mode" with a value of 3. The configuration request message instructs the wireless termination device 31 to create a wireless local area network and uniquely indicates the newly created wireless local area network using the wireless local area network transmission identifier contained in the wireless local area network transmission identification information element. In addition, the configuration request message further indicates that after the wireless termination device 31 creates a new wireless local area network, the access controller 41 and the wireless termination device 31 Simple Tunnel mode is used when forwarding CAPWAP packets from or to the WLAN.

Preferably, a plurality of wireless local area network transmission identifiers may be included in the one configuration request message to command the wireless termination device 31 to create a plurality of wireless local area networks, and the different wireless local area network transmission identifiers represent different newly created wireless local area networks. After receiving the configuration request message, the wireless termination device 31 creates one or more wireless local area networks, and distinguishes the created wireless local area network by using the wireless local area network transmission identifier carried in the configuration request message. In other words, in the wireless termination device 31, a mapped relationship is established between the created wireless local area network and the received wireless local area network transmission identification.

Finally, a CAPWAP packet is transmitted between the wireless termination device 31 and the access controller 41 via a step S79 on the Layer 2 network between the two. According to whether the wireless termination device 31 operates in the Local-MAC mode or the Split-MAC mode, the specific encapsulation format of the CAPWAP data packet adopts the encapsulation format shown in Figures 4a and 4b, respectively.

Those skilled in the art can understand that the present invention can be easily implemented on the basis of the extension of the existing CAPWAP protocol, thereby improving the transmission between the wireless termination device and the access controller in the centralized wireless network in the existing CAPWAP protocol. The transmission efficiency of CAPWAP packets also effectively improves the utilization of limited and valuable transmission bandwidth resources between the wireless termination device and the access controller. At the same time, due to the introduction of the WLAN transmission identifier, it is very simple for the wireless termination device and the access controller to distinguish which WLAN from which the data packet comes.

It should be noted that when the CAPWAP data packet is transmitted between the wireless termination device 31 and the access control 41 through the channel mode defined by the existing CAPWAP protocol such as 802.3 frame tunnel mode, native frame tunnel mode, and local bridging, Adding a WLAN transmission identification information element defined by the extension of this embodiment to the CAPWAP data packet, so that the wireless termination device 31 or the access controller 41 distinguishes that the transmitted CAPWAP data packet is specifically from or sent to the wireless termination device. Which WLAN of 31 is. In addition, FIG. 10 is a structural diagram showing another extended definition of a wireless local area network transmission identification information element, wherein the transmission identification specifically includes an 8-bit wireless ID (Radio ID) and an 8-bit wireless local area network ID (WLAN ID). ), a 16 ratio The IEEE 802. il connection identifier (AID, Association Identifier) and the 32-bit VLAN tag information, wherein the VLAN tag includes a 16-bit 802.1g type identifier (802. lg type identifier) with a fixed value of 0x8100, and a 3-bit user. Priority information, 1-bit specification format indication (CFI, Canonical Format Indicator) and 12-bit VLAN information. When the access controller controls the wireless termination device to create a wireless local area network, the access device simultaneously transmits the information element as shown in FIG. 10 to the wireless termination device.

The specific embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or changes within the scope of the appended claims. The technical solution of the present invention can be implemented by software or hardware.

Claims

A method for data transmission between the access controller and a wireless termination device in an access controller of a wireless network, wherein the wireless termination device allows one or more wireless local area network accesses, The access controller and the wireless termination device are connected to the same Layer 2 network, and the method includes the following steps:

c configuring the wireless termination device with one or more wireless local area network transmission identifiers, wherein one of the one or more wireless local area network transmission identifiers uniquely corresponds to one of the one or more wireless local area networks, different wireless The local area network transmission identifier corresponds to a different wireless local area network;

d. transmitting a data packet to the wireless termination device on a Layer 2 network, wherein the data packet includes one of the one or more wireless local area network transmission identifiers for indicating that the data packet is sent to the included The wireless local area network transmits the identification corresponding to the wireless local area network.

2. The method according to claim 1, wherein step d further comprises:

Determining the included wireless local area network transmission identity based on the only corresponding wireless local area network transmission identity of the wireless local area network for the purpose of the data packet.

The method according to claim 1 or 2, wherein the step d further comprises: - receiving a data packet sent from the wireless termination device on a layer 2 network, wherein the data packet comprises the one Or one of the plurality of wireless local area network transmission identifiers for indicating that the data packet is from one of the one or more wireless local area networks corresponding to the included wireless local area network transmission identifier.

The method according to any one of claims 1-3, further comprising the step of: before step c:

And transmitting, to the wireless termination device, license information including a data transmission format, where the license information includes information capable of directly transmitting data through the layer 2 network, and is configured to guide the wireless termination device to pass the second The layer network sends and receives the data packet.

The data transmission method according to claim 4, further comprising the steps of: before step b:

Receiving a connection mode letter from the wireless termination device regarding the Layer 2 network And determining that the access controller and the wireless termination device are connected on the same layer 2 network.

The data transmission method according to any one of claims 1 to 5, wherein the data packet comprises 802.3 frames. And a method for performing data transmission between the controllers, wherein the wireless termination device allows one or more wireless local area networks to access, and the access controller and the wireless termination device are connected to the same layer 2 network, The method is characterized in that the method comprises the following steps:

0. Receive configuration information about a wireless local area network transmission identifier from the access controller, including one or more wireless local area network transmission identifiers, one of the one or more wireless local area network transmission identifiers uniquely corresponding to the one Or one of the plurality of wireless local area networks, the different wireless local area network transmission identifiers correspond to different wireless local area networks;

Transmitting a data packet to the access controller on a Layer 2 network, wherein the data packet includes one of the one or more wireless local area network transmission identifiers for indicating that the data packet is from the included The wireless local area network transmits one of the one or more wireless local area networks corresponding to the identifier.

The method according to claim 7, wherein the step p further comprises:

And determining the included wireless local area network transmission identifier based on a wireless local area network transmission identifier uniquely associated with the source wireless local area network of the data packet.

The method according to claim 7 or 8, wherein the step p further comprises: - receiving a data packet sent from the access controller on a layer 2 network, wherein the data packet comprises the One of the one or more wireless local area network transmission identifiers for indicating that the data packet is sent to one of the one or more wireless local area networks corresponding to the included wireless local area network transmission identifier.

The method according to any one of claims 7-9, characterized in that, before step 0, the method further comprises the steps of:

Receiving, by the access controller, permission information related to a data transmission format, where the license information includes information capable of data transmission directly through the layer 2 network.

11. The method according to claim 10, further comprising: before step n:

And transmitting, to the access controller, connection mode information about the layer 2 network of the wireless termination device.

The method according to any one of claims 7-11, characterized in that the data packet comprises 802.3 frames.

13. An apparatus for data transmission between the access controller and a wireless termination device in an access controller of a wireless network, wherein the wireless termination device allows one or more wireless local area network accesses, The access controller and the wireless termination device are connected to the same Layer 2 network, and the device includes:

Transmitting an identity transmitting device, configured to configure one or more wireless local area network transmission identifiers to the wireless termination device, wherein one of the one or more wireless local area network transmission identifiers uniquely corresponds to the one or more wireless local area networks One of the different WLAN transmission identifiers corresponds to a different WLAN;

a data packet transceiver for transmitting a data packet to the wireless termination device on a Layer 2 network, wherein the data packet comprises one of the one or more wireless local area network transmission identifiers for indicating the data packet A wireless local area network corresponding to the included wireless local area network transmission identifier.

The device according to claim 13, wherein the data packet transceiver is further configured to:

The device according to claim 13 or 14, wherein the data packet transceiver is further configured to:

Receiving a data packet sent from the wireless terminating device on a Layer 2 network, wherein the data packet comprises one of the one or more wireless local area network transmission identifiers for indicating that the data packet is from the One of the one or more wireless local area networks corresponding to the wireless local area network transmission identifier.

The device according to any one of claims 13-15, further comprising: a license information transmitting means for transmitting, to the wireless terminating device, license information containing a data transmission format, wherein the license information includes information capable of data transmission directly through the layer 2 network, for guiding the wireless The terminating device transmits and receives the data packet through the layer 2 network.

17. The device according to claim 16, further comprising:

a connection mode receiving device, configured to receive connection mode information about the layer 2 network from the wireless termination device, and determine that the access controller and the wireless termination device are connected to the same layer 2 network on.

18. Apparatus according to any of claims 13-17, wherein said data packet comprises 802.3 frames. And a device for performing data transmission between the controllers, wherein the wireless termination device allows one or more wireless local area networks to access, and the access controller and the wireless termination device are connected on the same layer 2 network, The feature is that the device comprises:

Transmitting identifier receiving means for receiving configuration information about the wireless local area network transmission identifier from the access controller, including one or more wireless local area network transmission identifiers, one of the one or more wireless local area network transmission identifiers Uniquely corresponding to one of the one or more wireless local area networks, different wireless local area network transmission identifiers corresponding to different wireless local area networks;

a data packet transceiving device, configured to send a data packet to the access controller on a Layer 2 network, wherein the data packet includes one of the one or more wireless local area network transmission identifiers for indicating the data The packet is from one of the one or more wireless local area networks corresponding to the included wireless local area network transmission identifier.

The device according to claim 19, wherein the data packet transceiver is further configured to:

Determining the included wireless local area network transmission identification based on a wireless local area network transmission identifier uniquely associated with the source wireless local area network of the data packet.

The device according to claim 19 or 20, wherein the data packet transceiver is further configured to: Receiving a data packet sent from the access controller on a Layer 2 network, wherein the data packet comprises one of the one or more wireless local area network transmission identifiers for indicating that the data packet is sent to the One of the one or more wireless local area networks corresponding to the included wireless local area network transmission identifier.

The device according to any one of claims 19 to 21, further comprising:

a license information receiving device, configured to receive license information sent by the access controller and having a data transmission format, wherein the license information includes information capable of data transmission directly through the layer 2 network.

The device according to claim 22, further comprising:

a connection mode transmitting device, configured to send, to the access controller, connection mode information about the layer 2 network of the wireless termination device.

24. Apparatus according to any of claims 19-23, wherein said data packet comprises 802.3 frames.