CN103391641A - Wired broadband wireless extension system - Google Patents
Wired broadband wireless extension system Download PDFInfo
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- CN103391641A CN103391641A CN2013101249962A CN201310124996A CN103391641A CN 103391641 A CN103391641 A CN 103391641A CN 2013101249962 A CN2013101249962 A CN 2013101249962A CN 201310124996 A CN201310124996 A CN 201310124996A CN 103391641 A CN103391641 A CN 103391641A
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Abstract
The invention relates to a wired broadband wireless extension system. The wired broadband wireless extension system is composed of WiFi (wireless fidelity) base stations and a CPE (central processing element) which are communicated in a wireless communication mode. The wired broadband wireless extension system is characterized in that every WiFi base station is mainly composed of a 802.11b/g module, a MAC (media access control) Bridge module, a DPP (down packet partitioning) module, a UPM (up packet multiplexing) module, a PCF (packet control function) module, an OAM (operation administration and management) module, DBW (data buffering work system) and DBU (data buffering unit) modules, an L2SPW and L2SPU module and an MGU (media gateway unit) module; three circuits which are respectively composed of a 802.11b/g module, a MAC Bridge module, a DPP module, a UPM module, a PCF module and an OAM module are connected with the DBW module through the DPP module and connected with the DBU module through the UPM module; the DBW module is connected with a PMD (physical medium dependent layer) and a PMA through the L2SPW module, and the PMD and the PMA are connected with the DBU module through the L2SPU module; a POWER powers the modules above.
Description
Technical field:
The present invention relates to the wireless stretch system of a kind of cable broadband.
Background technology
On January 16th, 2004, the Ministry of Information Industry issues " about carry out the notice of Village Interconnection Project pilot work in the part provinces and regions ", from then on pulls open communication " the village village is logical " engineering construction prelude.In Eleventh Five-Year Plan, communication " the village village is logical " engineering construction determines that the Yi“Cun village takes on the telephone, and can surf the Net in every country " be construction object, " the village village the is logical " engineering construction of communicating by letter is pushed to a new high.But because of factor impacts such as the access technology means are poor, the rural area network based living environment abominable, the networking investment is large, communication " the village village is logical " engineering construction is made slow progress eventually, and various places are unrealized government planning target all.In " 12 " planning, again emphasize to strengthen the farmer communication infrastructure construction, promote the Option of Rural Information Service ability, advance the equalization of communication basic public services.
Urban residents are sparsely populated, apart from each other, but One's name is legion, and cable consumption is large for this reason, and engineering cost is high.In addition, the rural area network based living environment is abominable, and the cable transmission distance is limited, needs more active equipments in the Rural Broadband network, and this will directly cause network failure rates and network operation expense to be climbed to a higher point.Therefore, no matter select which kind of traditional access technology (xDSL, LAN, CableModem) to carry out the construction of rural broadband network, all face problems.Approximately 400000 of China administrative villages, approximately 3,000,000, natural village.Along with rural economy is fast-developing, the Rural Broadband access demand can increase fast.How quick, convenient, cheaply with rural area computer accessing Internet, for urban residents provide information service.
Summary of the invention
, in order to overcome above-mentioned defect, the purpose of this invention is to provide the wireless stretch system of a kind of cable broadband.
To achieve these goals, the present invention adopts following technical scheme:
The wireless stretch system of cable broadband, it consists of WiFi base station and CPE two parts, contacts by wireless communication mode between WiFi base station and CPE.
The WiFi base station mainly comprises 802.11b/g module, MAC Bridge module, DPP module, UPM module, PCF module, OAM module, DBW and DBU module, L2SPW and L2SPU module, MGU module, three covers are connected the DBW module and by the UPM module, connect the DBU module by the DPP module by the circuit that 802.11b/g module, MAC Bridge module, DPP module, UPM module, PCF module, OAM module form, the DBW module connects PMD and PMA by the L2SPW module, PMD is connected the L2SPU module and connects the DBU module with PMA, POWER provides power supply for above-mentioned module.
CPE is a kind of bridge, is used for being connected with spider lines and wireless network.CPE provides broadband inserting service by the LAN interface of UNI side to the user; By wireless, customer service is bridged to the WiFi base station.Cpe device comes related upper WiFi base station by monitoring the Beacon frame.CPE is in the subordinate location in the wireless stretch system of cable broadband, accept the mandate of WiFi base station, sends data in authorized window, to avoid conflict.
WiFi of the present invention base station comprises three groups of IEEE802.11b/g unit, has effectively improved the entire system capacity, reduces the network design cost; The enhancement mode media access control sublayer, effectively reduce collision probability; Efficient SDRAM dispatching algorithm.
Description of drawings
Fig. 1 is WiFi architecture of base station schematic diagram of the present invention.
Fig. 2 is DPP modular structure schematic diagram.
Fig. 3 is UPM modular structure schematic diagram.
Fig. 4 is DBW and DBU module whole structure.
Fig. 5 is L2SPW and L2SPU module whole structure.
Fig. 6 is PCF module whole structure.
Embodiment
Further illustrate below in conjunction with accompanying drawing:
The wireless stretch system of a kind of cable broadband, it consists of WiFi base station and CPE two parts, contacts by wireless communication mode between WiFi base station and CPE.as shown in Figure 1, the WiFi base station mainly comprises the 802.11b/g module, MAC Bridge module, the DPP module, the UPM module, the PCF module, the OAM module, DBW and DBU module, L2SPW and L2SPU module, the MGU module, three covers are by the 802.11b/g module, MAC Bridge module, the DPP module, the UPM module, the PCF module, the circuit that the OAM module forms connects the DBW module and by the UPM module, connects the DBU module by the DPP module, the DBW module connects PMD and PMA by the L2SPW module, PMD is connected the L2SPU module and connects the DBU module with PMA, POWER provides power supply for above-mentioned module.
The following explanation of each module:
(1) 802.11b/g module
This module is mainly completed two parts function, and first MAC layer-management is controlled function, and it two is that the PHY layer-management is controlled function.
The MAC layer be responsible for and STA between communication, such as scanning, authentication, access, encrypt, the functions such as roaming, synchronous and transfer of data.And the message between STA comprises Frame, control frame and management frames three types.Frame is user's various application messages, such as mail, WEB browse, video flowing and voice flow etc.Control frame is used for the transmission of assitance data frame, to reduce the data collision probability.Control frame comprises RTS, CTS and ACK three types.Management frames be responsible for and STA between ability mutual, authentication, the management work such as related.Management frames comprises Beacon, Probe, Authentication and Association.
The same with Ethernet, 802.11 adopt csma (carrier sense multiple access is called for short CSMA) mechanism to control the access to transmission medium.But, conflict (collisions) can the valuable transfer resource of waste, and therefore 802.11 then use conflict to avoid (CSMA/CA) mechanism, but not use the practiced collision detection of Ethernet (CSMA/CD) mechanism.
Physical layer is divided into two sublayers, i.e. sublayer relevant with physical medium, physical layer set sublayer (Physical Layer Convergence Procedure is called for short PLCP) (Physical Medium Dependent is called for short PMD).The function of PLCP is frame and the aerial radio wave that pass of set from the MAC layer.PLCP can add the frame head of oneself simultaneously for frame, for example: lead code.But, the lead code that adopts of every kind of modulation system is all not identical.Each position that PMD is responsible for PLCP is transmitted utilizes antenna to be sent in the air.
(2) MAC Bridge module
This module is completed the conversion between 802.11 frames and 802.3 frames.802.11 the conversion logic of frame to 802.3 frame is as follows:
When ◇ receives a frame when acceptance point, at first can detect the basic integrality of this frame.Next, access point can be for the physical layer of using, the check code (PCS) of checking frame.
After the reception of ◇ checking frame was errorless, access point continued to check whether should further process this frame.
In case whether the judgement of ◇ access point needs further to process this frame, just need first to its deciphering (see and need).
After the ◇ deciphering, access point checks whether whether this frame is frame fragment, need further restructuring.
◇ judges whether this frame needs bridge joint, if need to would carry out frame conversion.
After the ◇ frame format converts 802.3 to, recalculate FCS.
The new frame that ◇ will produce is given subsequent module for processing.
802.3 the conversion logic of frame to 802.11 frame is the inverse process of said process.
(3) DPP module
This module is completed the downstream packets classification feature.DPP is responsible for distinguishing DATA frame, PCF frame and OAM frame from downlink data.Wherein data frame classification has following mode: based on MAC Address, based on COS, based on VLAN ID, based on IP address etc.DPP module whole structure is illustrated in fig. 2 shown below.
The CLASSIFY module is that the frame that receives is carried out frame classification, and distinguishing Frame is PCF frame, OAM frame or Frame.If Frame, also want the effective information of further analysis frame, for example:
The priority of ◇ present frame;
◇ VLAN label;
The ◇ frame type;
Whether comprise the IGMP packet in the ◇ frame;
◇。。。
Fifo module is that the frame that receives is carried out buffer memory.
The data frame format that the DPP module is used is as shown below:
(4) UPM module
The up multiplexing selection problem of this resume module frame, that is: send according to certain priority.Wherein, the priority of PCF frame is the highest, and OAM frame priority is taken second place, and Frame priority is minimum.When sending, always preferentially the PCF frame is sent, then the OAM frame is sent, send finally Frame.The related frame format of the form of this module institute processed frame and DPP module is identical.UPM module whole structure is illustrated in fig. 3 shown below.
The VPCF module receives the PCF frame that the PCF module sends over, and is stored in respectively in the FIFO of inside modules, and higher level's module by signal after arriving sends the PCF frame.
The VOAM module receives the OAM frame that the OAM module sends over, and is stored in respectively in the FIFO of inside modules, and higher level's module by signal after arriving sends the OAM frame.
The VDBU module receives the Frame that the DBU module sends over, and is stored in respectively in the FIFO of inside modules, and higher level's module by signal after arriving sends the OAM frame.
The enable signal of the up transmission of permission that fifo module sends over according to the PCF module, select frame to send according to priority, and PCF frame priority is the highest, OAM takes second place, and Frame priority is minimum.
(5) DBW and DBU module
The DBW module is responsible for the downlink data frame of three groups of radio-cells of buffer memory, and according to the priority of frame, sends data.DBU functions of modules and DBW are just opposite.DBW and DBU module whole structure are illustrated in fig. 4 shown below.
The DBWWR module from the DPP module receive the Frame send over and with its buffer memory to SDRAM.The DBWRD module, according to the upper layer module signal designation, is taken out Frame from SDRAM, then send to upper layer module, namely completes the descending transmission of data.
The DBUWR module receives the Frame after upstream data is processed, and needs are continued up data frame buffer memory to SDRAM.After receiving that upper layer module need to send the indication of data, take out data from SDRAM, carry out up transmission.
(6) L2SPW and L2SPU module
L2SPW and L2SPU module are completed two layer functions such as VLAN processing and speed limit processing.L2SPW and L2SPU module whole structure are illustrated in fig. 5 shown below.
The judgement that whether needs the speed limit frame that the LR module provides according to the DPP module, use token bucket algorithm to carry out speed limit to the frame of each priority and process, and give the follow-up data processing module Frame after speed limit.
The VLAN module is supported two kinds of VLAN patterns, i.e. transparent transmission and TAG pattern.Under transparent transmission mode, transceiving data is left intact, and directly forwards and gets final product.Under the TAG pattern,, at up direction,, if receive the data that contain TAG, directly abandon; , if receive the data that there is no TAG, forward after stamping TAG.
(7) PCF module
The PFC module is responsible for discovery and the registration of terminal, and responsible quene state reports, and is responsible for local clock synchronous, is responsible for authorizing frame processing etc.PCF module whole structure is illustrated in fig. 6 shown below.
VDPP completes the classification to the PCF frame that receives, i.e. GATE frame, DISCOVERY frame and PAUSE frame, and it is delivered to the subsequent treatment module.
Base station sends GATE message to distribute it to send authorization message to each CPE, comprises time started and the length of window of mandate, thus the up transmission of indirectly control CPE.When the local counter of CPE was identical with the time started in GATE message, CPE just started up transmission.CPE will extrapolate the time of actual transmission data and leave enough surpluses, thereby guarantees to discharge wireless link before the time interval of authorizing is finished.The GATE module is mainly completed transmission and the response of authorizing frame.
Discovery feature is completed the various functions of cpe end, comprises the response of REGISTER frame and the extraction of log-on message, is responsible for simultaneously framing and the transmission of REGISTER_REQ frame and REGISTER_ACK frame.Discovery feature helps CPE to realize " plug and play " function, and after CPE closes electricity, the CPE assigns authorized will no longer be given in base station; After CPE powers on, utilize the discovery frame to find unregistered CPE, and CPE is registered.For completing discovery procedure, at first base station will determine that is found a window, and namely a definite special period allows does not have registration to have again the CPE of service to send the registration request of oneself.And the time started of this discovery window and duration are sent to each CPE with the form of broadcasting, after CPE receives discovery window message, resolve and send registration information in finding window.
The effect of PAUSE module is to surpass when critical in the base station formation, and broadcasting PAUSE frame, require each CPE to postpone the transmission of data.
The SETTIME module is responsible for producing the also broadcasting of signal lock in time.
(8) OAM module
Be responsible for the various management information of carrying, by this module, each terminal of access point energy telemanagement, for example: terminal configuration, terminal software upgrading, terminal warning information report etc.
(9) MGU module
Radio management, MAC bridge, bag classification, point-to-point emulation, operation management maintain, two layer services are processed
The MGU module is responsible for the functions such as equipment configuration, management, alarm, is responsible for coordinating three groups of radio-cell synchronizing functions.
CPE is a kind of bridge, is used for being connected with spider lines and wireless network.CPE provides broadband inserting service by the LAN interface of UNI side to the user; By wireless, customer service is bridged to the WiFi base station.Cpe device comes related upper WiFi base station by monitoring the Beacon frame.CPE is in the subordinate location in the wireless stretch system of cable broadband, accept the mandate of WiFi base station, sends data in authorized window, to avoid conflict.
Claims (5)
1. the wireless stretch system of cable broadband, it consists of WiFi base station and CPE two parts, contacts by wireless communication mode between WiFi base station and CPE, it is characterized in that:
the WiFi base station mainly comprises the 802.11b/g module, MAC Bridge module, the DPP module, the UPM module, the PCF module, the OAM module, DBW and DBU module, L2SPW and L2SPU module, the MGU module, three covers are by the 802.11b/g module, MAC Bridge module, the DPP module, the UPM module, the PCF module, the circuit that the OAM module forms connects the DBW module and by the UPM module, connects the DBU module by the DPP module, the DBW module connects PMD and PMA by the L2SPW module, PMD is connected the L2SPU module and connects the DBU module with PMA, POWER provides power supply cable broadband according to claim 1 wireless stretch system for above-mentioned module, it is characterized in that: the CLASSIFY module in the DPP module is that the frame that receives is carried out frame classification, distinguishing Frame is the PCF frame, OAM frame or Frame, fifo module is that the frame that receives is carried out buffer memory, the data frame format that the DPP module is used.
2. the wireless stretch system of cable broadband according to claim 1, it is characterized in that: the UPM modular structure is: the VPCF module receives the PCF frame that the PCF module sends over, and be stored in respectively in the FIFO of inside modules, higher level's module by signal after arriving sends the PCF frame;
The VOAM module receives the OAM frame that the OAM module sends over, and is stored in respectively in the FIFO of inside modules, and higher level's module by signal after arriving sends the OAM frame;
The VDBU module receives the Frame that the DBU module sends over, and is stored in respectively in the FIFO of inside modules, and higher level's module by signal after arriving sends the OAM frame;
The enable signal of the up transmission of permission that fifo module sends over according to the PCF module, select frame to send according to priority, and PCF frame priority is the highest, OAM takes second place, and Frame priority is minimum.
3. the wireless stretch system of cable broadband according to claim 1, it is characterized in that: DBW and DBU module whole structure are: the DBWWR module from the DPP module receive the Frame that sends over and with its buffer memory to SDRAM; The DBWRD module, according to the upper layer module signal designation, is taken out Frame from SDRAM, then send to upper layer module, namely completes the descending transmission of data;
The DBUWR module receives the Frame after upstream data is processed, and needs are continued up data frame buffer memory to SDRAM; After receiving that upper layer module need to send the indication of data, take out data from SDRAM, carry out up transmission.
4. the wireless stretch system of cable broadband according to claim 1, it is characterized in that: L2SPW and L2SPU module whole structure: the judgement that whether needs the speed limit frame that the LR module provides according to the DPP module, frame to each priority uses token bucket algorithm to carry out the speed limit processing, and gives the follow-up data processing module Frame after speed limit;
The VLAN module is supported two kinds of VLAN patterns, i.e. transparent transmission and TAG pattern; Under transparent transmission mode, transceiving data is left intact, and directly forwards and gets final product; Under the TAG pattern,, at up direction,, if receive the data that contain TAG, directly abandon; , if receive the data that there is no TAG, forward after stamping TAG.
5. the wireless stretch system of cable broadband according to claim 1, it is characterized in that: PCF module whole structure is: VDPP completes the classification to the PCF frame that receives, be GATE frame, DISCOVERY frame and PAUSE frame, and it is delivered to the subsequent treatment module.
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| CN1820520A (en) * | 2003-07-17 | 2006-08-16 | 美商内数位科技公司 | Method and system for delivery of assistance data |
| CN1985478A (en) * | 2004-07-20 | 2007-06-20 | 国际商业机器公司 | Communication device, communication system, communication method, communication service method, program, and recording medium |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1820520A (en) * | 2003-07-17 | 2006-08-16 | 美商内数位科技公司 | Method and system for delivery of assistance data |
| US20110149867A1 (en) * | 2003-07-17 | 2011-06-23 | Interdigital Technology Corporation | Method and system for delivery of assistance data |
| CN1985478A (en) * | 2004-07-20 | 2007-06-20 | 国际商业机器公司 | Communication device, communication system, communication method, communication service method, program, and recording medium |
Non-Patent Citations (1)
| Title |
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| 张淑娟: "农村WLAN覆盖解决方案", 《电信工程技术与标准化》 * |
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Address after: 310012 No. 618, Xixi Road, Hangzhou, Zhejiang Patentee after: Zhejiang Weilike Communication Co., Ltd. Address before: 310012 No. 618, Xixi Road, Hangzhou, Zhejiang Patentee before: Hangzhou Winic Communication Systems Co., Ltd. |
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