CN201207659Y - Wireless access point and constructed MESH network - Google Patents

Disclosed is a wireless access point, which comprises a central processing unit, a memory, an optical data converter, two optical fiber interfaces, at least one peripheral component interconnection for connecting a wireless network card as well as a power supply system, and the memory includes a Flash Memory and a dual-channel memory, the Flash Memory stores a centralized algorithm of the wireless access point, and a MESH algorithm of a storage system of the dual-channel memory is integrated by a MESH network system composed of the wireless access point, an optical MESH network, a wireless MESH network and a wired MESH network. The utility model has the advantages that: the wireless access point has the adaptive function due to the adoption of the MESH network; the wireless access point adopts the optical fiber interfaces to realize the simultaneous wireless connection, wired connection and optical fiber connection in the whole network; and the wireless access point has the dual-backup function.

The MESH network of WAP (wireless access point) and composition

Technical field

The utility model relates to the communications field, particularly the WAP (wireless access point) that communicates about a kind of a plurality of communicators that are present in the coverage and the MESH network of composition.

Background technology

1, wireless aps

Wireless aps (AP, Access Point, wireless access node, session point or access bridger) not only comprises simple property WAP (wireless access point) (wireless aps), is the general designation of wireless router kind equipments such as (containing radio network gateway, wireless bridge) too.

Along with popularizing of wireless router, as not special explanation, generally or only the wireless aps of being called is interpreted as simple property wireless aps under the present case, distinguished to show with wireless router.It mainly provides wireless stations to cable LAN with from the visit of cable LAN to wireless stations, and the wireless stations in the access points coverage can intercom mutually by it.

Simple property wireless aps is exactly a wireless switch, only provides the function of a wireless signal transmission.The operation principle of simple property wireless aps is that network signal is sent by twisted-pair feeder, and the compiling through the AP product converts the electrical signal to radio signals send out, and forms the covering of wireless network.According to different power, it can be realized in various degree, the network coverage of different range, and the largest coverage distance of general wireless aps can reach 300 meters.

Most simple property wireless aps itself do not possess routing function, and the server capability that comprises DNS, DHCP, Firewall all must have independently route or computer finish.Present most wireless aps all supports multi-user's (30-100 platform computer) to insert, data encryption, and functions such as many speed transmission, in family, office, a wireless aps just can realize the wireless access of all computers.

Simple property wireless aps also can be done necessary control and management to the computer that wireless network card is housed.Simple property wireless aps promptly can be passed through 10base-T (WAN) port and directly link to each other with the ADSL MODEM or the CABLE MODEM (CM) of built-in routing function, also can have access to spider lines again by switches/hubs, broadband router in use.

Wireless aps is similar with wireless router, and the coverage of IEEE 802.11b and IEEE 802.11g is indoor 100 meters, outdoor 300 meters according to consensus standard itself.This numerical value only is theoretical value, in actual applications, can run into various barriers, and wherein with glass, plank, the plaster wall minimum that influences to wireless signal, and concrete wall and iron are to the shielding maximum of wireless signal.So the common actual scope of application is: indoor 30 meters, outdoor 100 meters (not having barrier).Therefore, as link WAP (wireless access point) important in the wireless network, radio network gateway wireless aps (Access Point) just, its effect is similar to the hub in the cable network commonly used.

2、MESH

Wireless Mesh netword (based on wireless mesh network) is also referred to as " multi-hop (multi-hop) " network, and it is a kind of and the diverse novel radio network technology of conventional wireless network.In traditional wireless lan (wlan), each client all visits network by a Radio Link that links to each other with AP, the user must at first visit a fixing access point (AP) if intercom mutually, and this network configuration is called as single-hop networks.And in wireless Mesh netword, any wireless device node can be simultaneously as AP and router, and each node in the network can send and received signal, and each node can carry out direct communication with one or more peer node.

The largest benefit of this structure is: congested if nearest AP causes owing to flow is excessive, data can re-route a less adjacent node of communication flows automatically and transmit so.The rest may be inferred, and packet can also continue to be routed to nearest with it next node and transmit according to the situation of network, till arriving the final destination.Such access mode is exactly the multi-hop visit.

Compare with traditional switching network, wireless Mesh netword has removed the wiring demand between the node, but still has redundancy scheme and rerouting function that distributed network provides.In wireless Mesh netword, if add new equipment, it is just passable only need to connect with the mains simply, and it can carry out self-configuration automatically, and determines best multi-hop transmission path.When interpolation or mobile device, network can be found change in topology automatically, and adjusts the communication route automatically, to obtain the most effective transmission path.

Five big advantages of Mesh network

Compare with traditional WLAN, wireless Mesh netword has several incomparable advantage:

1. dispose fast and be easy to install.It is very simple that the Mesh node is installed, and equipment is taken out in packing box, connected with the mains just.Owing to greatly simplified installation, the user can be easy to increase coverage and the network capacity that new node enlarges wireless network.In wireless Mesh netword, not that each Mesh node all needs wire cable to connect, what this was it with wired AP maximum is different.Therefore the design object of Mesh is exactly the quantity of wireline equipment and wired AP to be reduced to minimum, greatly reduces TCO and set-up time, and only the cost savings brought of this point are exactly considerable.The configuration of wireless Mesh netword is identical with traditional WLAN with other network management functions, and the user uses the experience of WLAN can be easy to be applied on the Mesh network.

2. non line of sight transmission (NLOS).Utilize the Wireless Mesh technology can be easy to realize the NLOS configuration, therefore have a wide range of applications in outdoor and public place.There is the user of direct sighting distance to receive wireless signal earlier with transmitting station, and then the signal forwarding that receives given the user of non-direct sighting distance.In this manner, signal can select optimal path constantly to jump to another user from a user automatically, and the final targeted customer who arrives no direct sighting distance.Like this, the user with direct sighting distance is actually the proximal subscribers that does not have direct sighting distance provides the WiMAX access function.Wireless Mesh netword can non line of sight the characteristic of transmission expanded the application and the coverage of WiMAX greatly.

3. robustness.Realize that the network robustness usual way is to use multi-router to transmit data.If certain router breaks down, information is transmitted by backup path by other routers.The Mesh network is more healthy and stronger more than single-hop networks, because it does not rely on the performance of some single nodes.In single-hop networks, if some nodes break down, whole network is just paralysis thereupon also.And in the Mesh network configuration, because each node all has one or several to transmit the path of data.If nearest node breaks down or is interfered, packet will be routed automatically to backup path and proceed transmission, and the operation of whole network can not be affected.

4. structure is flexible.In single-hop networks, equipment must sharing A P.If several equipment are wanted accesses network simultaneously, just may produce traffic congestion and cause the speed of service of system to reduce.And in multihop network, equipment can be connected to network simultaneously by different nodes, therefore can not cause the reduction of systematic function.The Mesh network also provides bigger redundancy scheme and traffic load equilibrium function.In wireless Mesh netword, each equipment all has a plurality of transmission paths to use, and network can be according to the traffic load situation of each node allocate communications route dynamically, thereby has avoided the traffic congestion of node effectively.And present single-hop networks can not dynamically be handled the overload problems of Communication Jamming and access point.

5. high bandwidth.The physical characteristic of radio communication has determined the short more just easy more acquisition high bandwidth of the distance of communications, because along with the increase of wireless transmission distance, various interference and other cause the factor of loss of data to increase thereupon.Therefore select shortly to jump that to transmit data will be a kind of effective ways that obtain the higher network bandwidth through a plurality of, and this Mesh network advantages place just.

In the Mesh network, a node can not only transmit and reception information, can also serve as router near node forwarding information it, and along with the increase with possible number of paths of interconnecting of more nodes, total bandwidth also increases greatly.

In addition, because each short transmission range of jumping is short, transmission data desired power is also less.Since multihop network uses lower-wattage with the node of transfer of data to vicinity usually, the wireless signal between the node disturbs also less, and the channel quality and the channel transport efficiency of network improve greatly, thereby can realize higher network capacity.Such as in highdensity urban network environment, the Mesh network can reduce the phase mutual interference of the neighboring user of using wireless network, improves the utilization ratio of channel greatly.

3 stages have been experienced in the development of AP, phase I is to solve point-to-point transmitting-receiving problem, second stage is the interconnected stage of point-to-multipoint, because hardware reason and software algorithm is immature, causes wireless network can't realize that the transmission of big data quantity is connected with network, is mainly reflected on the long-distance transmissions of bandwidth, secondly the also a lot of problems of networking occur, WDS is exactly a problem wherein, if a Centroid goes wrong, and the whole system paralysis.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of and has self adaptation, Optical Fiber Transmission, and the WAP (wireless access point) of double copies function.

It is a kind of by having self adaptation, Optical Fiber Transmission that technical problem to be solved in the utility model is to provide, and the MESH network system formed of the WAP (wireless access point) of double copies function.

The utility model is what one of to solve the problems of the technologies described above by the following technical programs: a kind of WAP (wireless access point), comprise central processing unit, memory, optical data converter, two optical fiber interfaces, at least one peripheral element extension interface, power-supply system, memory wherein, optical data converter and peripheral element extension interface all are connected to central processing unit, described optical fiber interface is connected to described optical data converter, described memory comprises flash memory and double-channel memory, the concentrated algorithm of storage WAP (wireless access point) in the described flash memory, for central processing unit provides instruction and command system operation, the MESH algorithm of double-channel storage system provides central processing unit operation Webweb from the instruction that is dynamically connected.

This utility model can further be specially:

Described central processing unit model is AR7141.

The concentrated algorithm of the WAP (wireless access point) of storing in the described flash memory comprises MIMO (many inputs, many output), QOS (service quality) and LINUX 2.611 Embedded software systems.

Described optical data converter adopts the binary channels ethernet transceiver of BCM5482 model.

Described optical fiber interface adopts the small form factor pluggable module, and electrical signal conversion is become light signal, and the up link of this WAP (wireless access point) is provided, and one of them optical fiber interface is used for main communication, and another optical fiber interface is standby.

Described peripheral element extension interface is the minisize peripheral element extension interface, is used for connecting the wireless network card of two 802.11A/B/G/N.

Comprise signal lamp, described signal lamp is connected to described central processing unit.

The utility model be solve the problems of the technologies described above by the following technical programs two: a kind of MESH network system that is formed by above-mentioned WAP (wireless access point), described MESH network system light harvesting MESH network system, wired MESH network system and Wireless MESH network system are in one.

The advantage of the utility model WAP (wireless access point) is:

1, owing to having adopted the MESH network, so the utility model WAP (wireless access point) has adaptation function: simultaneously available by all transmission paths that each WAP (wireless access point) is formed; Path rapid convergence; Point-to-point, the path of putting gateway can be selected automatically;

2, this WAP (wireless access point) adopts optical fiber interface, therefore, has realized in the whole network that wireless connections, optical fiber connect and wired lan connection three's unification;

3, storage has a double copies function, realizes that the signal transmission is two different data code flows, i.e. MPEG4 and JEPG dual mode, and it is the single-frame images storage that first kind of mode watched image and storage, another kind of mode for monitoring;

4, the bandwidth problem-11a of long-distance transmissions b g n, carry out N standard bandwidth 300,000,000, interchannel has solved and has faced the problem of disturbing frequently simultaneously, realize that multichannel, big bandwidth, automatic interconnected beehive net are the MESH algorithm, consider the characteristics of its networking on a large scale especially, each MESH data and light mouth are interconnected, realize that simultaneously light mouth and MESH are interconnected, thoroughly solve networking transmission on a large scale.

Description of drawings

The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.

The MESH network diagram that Fig. 1 is made up of the utility model WAP (wireless access point).

Fig. 2 is the structured flowchart of the utility model WAP (wireless access point).

Embodiment

See also Fig. 1, the communication network figure that forms by the utility model WAP (wireless access point).Wherein this communication network adopts Wireless MESH network (based on wireless mesh network).

Wherein memory, optical data converter and peripheral element extension interface all are connected to central processing unit, and this optical fiber interface is connected to this optical data converter.

It is the central processing unit of AR7141 that this central processing unit 1 adopts the model of Athros company, AR7141 is the high-performance central processing unit of a 400MHZ MIPS (microprocessor that does not have inner interlocking pipelining-stage, Microprocessor without interlocked piped stages).

Optical data converter 3 is as the binary channels ethernet transceiver of the BCM5482 model of the WAN (wide area network, wide area network) of WAP (wireless access point) mouthful and cascade port employing BROADCOM company.

In the present embodiment, signal lamp 7 comprises that a power lamp, 2 wireless connections signal lamps, two light mouths insert signal lamp.

The operation principle of this WAP (wireless access point) is as described below:

The transmitting power of this WAP (wireless access point) is 100mw, and its software has following characteristic:

Under the control of CPU, in conjunction with embedded system Control Software, network interface card driving, optical module driving, MESH algorithm, WEP cryptographic algorithm and network management, by network interface card is access port, the management mode of WEB is carried out network management and exchange to transceive data, 1, is operative norm, 2-is a network speed, 3-is a Frequency Band Selection, 4-is the mode of operation of system, 5-is to the transmission data encipher method, 6-is the management of network interface card modulation mode of operation, and 7-is the management that network is connected and serves, and whole software embeds the big data management that is connected to form the wirelessly transmitting data networking.

1, standard

IEEE?802.11a，IEEE?802.11b，IEEE?802.11g，IEEE?802.11n

2, network speed is dynamic

1，2......................320Mbps

3, frequency range

IEEE?802.11a：5.0～5.85GHZ

IEEE?802.11b/g：2.4～2.4835GHZ

IEEE802.11n：5.0～5.85GHZ、2.4～2.4835GHZ

4, wireless mode of operation

AP Mesh pattern

5, safety

64bit/128bit?WEP

WPA-EAP，WPA-PSK，WPA2-EAP，WPA2-PSK

Pseudo?Virtual?LAN

Tagged?VLAN

IEEE?802.1X-TLS，TTLS，PEAP，EAP-SIM

Wireless MAC address filtering (ap mode)

6, modulation technique

CCK、DSS、OFDM、MIMO、MESH

7, other

WEB management, TELNET/Secure Shell (SSH), built-in Dynamic Host Configuration Protocol server (or SNMP).