CN103596290A - Wireless multi-network integration method - Google Patents
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Abstract
The invention discloses a wireless multi-network integration method which can be used for achieving integration of a plurality of wireless network cards to achieve bandwidth convergence. The wireless multi-network integration method mainly comprises the steps that (1) an automatic dialing portion mainly identifies the network cards automatically and conducts automatic dialing, (2) a network card information obtaining portion mainly obtains information of effective network cards dynamically, (3) a load balancing portion mainly achieves balanced scheduling on each dialing network card according to real-time statistics of the flow of each dialing network card, (4) a disconnection reconnection portion mainly achieves disconnection reconnection and deletes invalid network cards, and (5) a WiFi sharing portion mainly shares integrated bandwidth resources through the WiFi. Finally, the integration of the network cards is achieved to achieve the bandwidth convergence. In the wireless multi-network integration, the bandwidth resources are integrated, and the whole coverage rate and reliability can be improved.
Description
Technical field
The present invention relates to a kind of method that wireless many nets merge, can be applicable on various moving vehicles or bandwidth that multiple 3G network interface card and WiFi network interface card are realized in focus place converges, and realize wireless access and share, the wireless Internet access environment of high bandwidth, highly reliable, high stable is provided to numerous aggregate users, belongs to wireless communication field.
Background technology
Under the fast development of mobile communication and the Internet, Communications Market is taken as the leading factor gradually and is changed to the direction of taking as the leading factor with mobile broadband multimedia service by original voice service, wireless internet service will become following main flow business, and existing 3G single deck tape-recorder is difficult to meet the high bandwidth of the numerous aggregate users on various moving vehicles or focus place, the requirement of the mobile Internet communications applications of high stability.Therefore, need to be towards this particular demands, the solution of new generation of wireless information and amusement is supported in research, realizes the fusion of a plurality of Wireless Heterogeneous Networks, to reach the effect of bandwidth polymerization, finally for user provides more stable WiMAX resource and better network application experience.
By the retrieval of existing patent and correlation technique is found, existing and many nets merge the method and system that bandwidth aggregation technology is relevant and comprise:
(1) a kind of implementation method (CN102882802A) of many WAN jaws equipment load balancing is for cable network, and the many WAN jaws equipment that can realize based on linux system carries out the function of load balancing in proportion.
(2) a kind of heterogeneous network fusion method (CN102421139A) transmitting based on dynamic load mainly adopts mobile terminal period ground reporting terminal side information, under the cooperation of base station and WAP (wireless access point), destination mobile terminal completes vertical handover procedure and heterogeneous network performance is assessed, according to assessment result real-time calling dynamic load transmission scheme, realize the dynamic equilibrium of offered load.
Based on locating information at 3G network and the internetwork changing method of WIFI (CN1794681A) mainly for improving the efficiency of switching between heterogeneous network, reduce unnecessary switching times (ping-pong), handoff failure probability, probability of call blocking, and reduce signaling load and shorten switching time.
(4) a kind of wireless Internet access system and method (CN102665257A) of bandwidth stack inserts a plurality of wireless network cards for single subscriber terminal, and set up a plurality of parallel data transmission channels, reach the object that promotes transmission speed, thereby improved user terminal networking speed.
At present, there is following difference in essence in above-mentioned many net fusion bandwidth assemblage methods and the present invention:
1, fail to be applied under wireless network environment, as above-mentioned patent (1);
2, fail to realize the fusion of a plurality of wireless network cards such as a plurality of 3G network interface cards (comprising isomorphism network interface card and isomery network interface card) and WiFi net, reach bandwidth convergence effect, as above-mentioned patent (2), (3);
3, fail the bandwidth resources of merging to share away by WiFi, offer a plurality of user terminals and use, as above-mentioned patent (4);
4, fail according to the loading condition of network interface card and the corresponding network interface card of Dynamic Selection as online outlet, as above-mentioned patent (1), (2), (3), (4);
5, the network interface card information such as IP address, gateway that cannot intelligence obtain network interface card, as above-mentioned patent (1), (2), (3), (4);
6, when network interface card disconnects network and connects and fail to carry out network interface card disconnection reconnecting and dialing again, as above-mentioned patent (1), (2), (3), (4);
7, too complicated, the poor practicability of method, as above-mentioned patent (2), (3), (4);
Above-mentioned these defects cause up to the present also not having to be applied in the effective ways that many wireless network cards bandwidth on various moving vehicles or focus place converges.
Summary of the invention
In order to overcome the defect of existing many network interface cards bandwidth aggregation technology scheme, and be applied on various moving vehicles or focus place, router hardware platform based on OpenWrt system (a kind of modularization, automation embedded Linux system) (being named as the many cards of many nets fusion device in the design), adopt bandwidth convergence scheme can realize the dynamic load leveling that real-time monitoring network interface card flow carries out network interface card, timing acquisition network interface card information also starts disconnection reconnecting mechanism.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of wireless many network anastomosing methods, on the router hardware platform based on OpenWrt system, carry out the fusion of a plurality of 3G network interface cards and WiFi card, realize the fusion of a plurality of Wireless Heterogeneous Networks or homogenous networks, the object converging to reach bandwidth, and the bandwidth resources of merging are shared away by WiFi, comprise following key step:
Steps A, during starting up, identifies network interface card automatically, distinguishes network interface card for dialling and for the shared network interface card of WiFi;
Step B, obtains each network interface card information, comprises network interface card quantity, each network interface card title and their IP address, subnet mask and gateway address;
Step C, offered load equalization algorithm, and carry out Establishment strategy route according to obtained network interface card information, load-balancing algorithm is realized by software programming;
Step D, whether the network interface card that judgement has been dialled breaks, if broken string dials and reconnects, if do not break, continues to carry out downwards;
Step e, the situation of change of judgement network interface card information, if change, automatic updating strategy route, if do not change, waits for after 20 seconds, then jumps to step D and judge;
By above five key steps, finally make wireless many nets merge more intelligent.
In step C by the establishment of software programming implementation strategy route, at user's space, write a software kit, and carry out in dynamic-configuration linux system router routing rule and packet is carried out to mark and processing with this software kit, thereby do not need that (iproute2 and iptables are the application layer instruments in linux system with the iproute2 on linux system and iptables kit, can utilize them respectively the routing rule in linux kernel and firewall rule to be modified as required), only need this software kit of operation, construction strategy route automatically just, and can be according to the variation of the network interface card information tactful route that upgrades in time.
In establishment by software programming implementation strategy route, according to the size of the network interface card flow counting, realize equally loaded, be all to select the network interface card of flow minimum as final outlet, and the network interface card of selecteed minimum discharge can not occur congested at every turn.If occur congestedly, this network interface card is got rid of, again in residue network interface card, continue to select the network interface card of flow minimum as online outlet; Statistic frequency is statistics per second 1 time, and all network interface cards that dialled and can work all need statistics, finally each network interface card flow is contrasted and select the minimum network interface card of flow, and usings the outlet of the minimum network interface card of this flow as new initiation session.
In the workflow of strategy route, when there is the new session of initiating, first, add up the flow of all dialing network interface cards and select a flow minimum and have the network interface card of remaining bandwidth value; Secondly, in this session, first packet carries out before route selection, for this packet and under it in session subsequently all packet the mark value of corresponding outlet network interface card is set; Again, according to the mark value of packet, select corresponding routing table and route entry; Finally, after packet routing completes, carry out network address translation, realize the conversion of the outside net address of internal address, complete the bandwidth resources of merging are shared away by WiFi.
Adopt above method, can judge and select the network interface card that flow is little to export as online by the flow information certain period according to each network interface card, realize the dynamic load leveling that monitoring network interface card flow in real time carries out network interface card, converge bandwidth, and timing acquisition network interface card information start disconnection reconnecting mechanism.
Accompanying drawing is described as follows:
Below in conjunction with drawings and Examples, the present invention will be further described.
Fig. 1 is the present invention's scene graph of giving an example.
Fig. 2 is more the present invention nets to merge and realize schematic diagram.
Fig. 3 is that the present invention nets fusion load-balancing algorithm flow chart more.
Fig. 4 is general frame figure of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention more clear, below embodiment of the present invention is further described in detail.Specific embodiment described herein only, in order to explain the present invention, is not intended to limit the present invention.
The present invention can make multiple 3G network interface cards and WiFi network interface card reach the effect that bandwidth converges, but for convenient, the present invention is explained, 2 the 3G network interface card bandwidth convergence schemes of only usining in Fig. 1 carry out analytic explanation as embodiment.
Fig. 2 is schematic diagram of the present invention.As shown in Figure 2, when the request of Internet data bag enters the bandwidth aggregation scheme of the many cards of many nets fusion device, first be judged and whether have mark mark, if there is mark, enter and in route-caching, search the corresponding network interface card outlet of corresponding packet forwarding data bag.If there is no mark, use the mark module of firewall functionality in linux kernel to carry out mark to packet, packet Access strategy route querying routing rule forwarding data bag after mark upgrade route-caching record simultaneously.
Concrete implementation step is:
Steps A, during starting up, identifies network interface card automatically, distinguishes network interface card for dialling and for the shared network interface card of WiFi;
Step B, obtains the initial information of a plurality of 3G network interface cards and WiFi network interface card in router, and these packets of information purse rope card quantity, network interface card IP address, the network number of network interface card are, the gateway address of network interface card;
Described step B comprises:
(1) obtain network interface card total quantity, first by the information of read in OpenWrt system/proc/net/dev file, obtain the title of all network interface cards, and deposit nName[in] in array, the total quantity nCount of statistics network interface card.
(2) obtain effective network interface card title and quantity, nCount is the sum of network interface card, but the network interface card having is invalid, therefore need to select name and the sum of effective network interface card from these network interface cards.Employing method is to check one by one corresponding IP address information according to network interface card name, if there is effective IP address information, this network interface card is effective network interface card.Next, from these effective network interface cards, distinguish as the shared network interface card of WiFi and dialing network interface card, find out correct outlet and entrance, for setting up routing table and route entry is prepared.Suppose m=nCount, the effective network interface card quantity finally obtaining is k and dialing network interface card name is deposited in to array name[] in, and be assigned to wifi_name as the shared network interface card of WiFi, in order to reduce the difficulty of design, in this design, only set a WiFi network interface card.
(3) obtain effective network interface card IP, by setting up socket, input the name of effective network interface card, call corresponding IOCTL interface, can obtain the IP address information of corresponding network interface card.As: strcpy (ifr.ifr_name, szDevName); Ioctl (s, SIOCGIFADDR, & ifr).
(4) obtain each network interface card subnet mask information, the same with the method for obtaining IP address information.As: strcpy (ifr.ifr_name, szDevName); Ioctl (s, SIOCGIFHWADDR, & ifr).
(5) obtain each effective network interface card default gateway, and for PPP(Point-to-Point Protocol, peer-peer protocol), be IP address can be used as to default gateway to use.Because 3G network interface card dialing in this design belongs to PPP dialing, so can be used as default gateway, the IP value of 3G network interface card uses.Obtain three kinds of methods of network interface card default gateway address: method one reads default gateway information from/proc/net/route file; Method two, whether judgement dialing is now PPP dialing, if so, directly its IP address is returned, gateway is used by default; Method three, by IP address and the subnet mask account default gateway address of network interface card.
Step C, starting load equalization algorithm is also for each network interface card creates corresponding routing table;
Described step C comprises:
(1) remove all routing tables, route-caching and firewall rule in router.
(2) fill in corresponding route entry to the routing table of each network interface card, route entry can make the packet of this routing table from specifying network interface card to go out.Utilize tactful route to digital label in each routing table successively mark, as No. 1 network interface card is labeled as 1, No. 2 network interface card, be labeled as 2 etc., the like.
(3) (1 second) at set intervals, obtains the flow information of all network interface cards in OpenWrt system and selects flow minimum and congested network interface card does not also occur according to each network interface card flow contrast.
(4) mark module that uses firewall system in OpenWrt system in first packet marking of new session with the identical nfmark value of the minimum network interface card of flow.
(5) use the CONNMARK module of firewall system in OpenWrt system that the nfmark value of above-mentioned steps (4) is stored, then this nfmark value is copied in this connection, by the help of CONNMARK, nfmark can be acted on all packets of connection like this.
(6) use the nat function in linux system LAN IP address to be converted to the IP address of each network interface card.
Step D, carries out IP to each network interface card and realizes monitoring.If find that certain network interface card IP cannot obtain, judge that this network interface card has gone offline and started disconnection reconnecting mechanism;
Step e, the situation of change of judgement network interface card information, if change, update strategy route offered load equalization algorithm, if network interface card information does not change, wait for after 20 seconds, then jump to above-mentioned steps D and carry out cycle criterion.
Embodiment
That a 3G network interface card and a WiFi network interface card carry out the embodiment that bandwidth converges below, can reference view 1 and schematic diagram 3 shown in.
The enforcement of method of the present invention comprises following steps:
Steps A, the many cards of many nets fusion device starting up, identifies and classifies all network interface cards on it, finds that two effective dialing network interface cards and a WiFi share network interface card;
Step B, obtains and shares network interface card and dial-up network card information;
Obtain all network interface card information as follows:
(1) obtain network interface card title.The name that WiFi shares network interface card is called wlan1; The title of two dialing network interface cards is respectively the 3G of 3g-ppp0(UNICOM dialing) and wlan0(relaying WiFi signal), the network interface card quantity that effectively dials is 2.
(2) obtain the IP address information of these two network interface cards.3g-ppp0 network interface card ip address is that 10.243.93.234 and wlan0 network interface card ip address are 183.220.18.156.
(3) obtain the subnet mask address information of dialing network interface card.3g-ppp0 network interface card subnet mask is that 255.255.255.255 and wlan0 network interface card subnet mask are 255.255.248.0.
(4) obtain dialing network interface card default gateway address information.3g-ppp0 network interface card gateway address is that 10.243.93.234 and wlan0 network interface card gateway address are 183.220.16.1.
(5) obtain and share network interface card network number address.The network number of wlan1 network interface card is 192.168.1.0.
Step C, offered load equalization algorithm, and Establishment strategy route;
(1) remove all routing tables, route-caching and firewall rule in router.
(2) use ip module to create routing rule, routing table and route entries to two network interface cards, making fwmark is that 1 packet is walked network interface card No. 1, and the packet that fwmark is 2 is walked network interface card wlan0 No. 2.
(3) turn-on flow rate monitoring modular, use traffic monitoring modular regularly judges two network interface card flow values and records flow minimum and congested network interface card does not occur, and supposes that now flow is little and congested network interface card does not occur is 3g-ppp0.
(4), while initiating new online connection, to stamping fwmark to online request data package, fwmark value is 1, so just can make its new packet walk the 3g-ppp0 network interface card that flow is less.
(5) use the CONNMARK function of fire compartment wall framework in linux kernel to store nfmark, then nfmark value being copied to this online connects, like this by the help of CONNMARK, nfmark can be acted on all packets of connection, so just can make remaining all packets that this online connects directly walk 3g-ppp0 network interface card by route-caching.
(6) the IP address of using network address translation function in linux kernel to convert local net network 192.168.1.0/24 to 3g-ppp0 is that the online IP address of 10.243.93.234 and wlan0 is 183.220.16.122.
Step D, is used network interface card disconnection reconnecting mechanism module regularly to judge whether 2 network interface cards break, if certain network interface card broken string detected, this network interface card is carried out to disconnection reconnecting.
Step e, judges the situation of change of each network interface card information, if change, update strategy route offered load equalization algorithm, if network interface card information does not change, wait for after 20 seconds, then jump to above-mentioned steps D and carry out cycle criterion.
The network interface card of 3G described in the present invention comprises isomorphism network interface card and isomery network interface card, comprises WCDMA card, CDMA2000 card, TD-SCDMA card.
Claims (5)
1. wireless many network anastomosing methods, on the router hardware platform based on OpenWrt system, carry out the fusion of a plurality of 3G network interface cards and WiFi card, realize the fusion of a plurality of Wireless Heterogeneous Networks or homogenous networks, the object converging to reach bandwidth, and the bandwidth resources of merging are shared away by WiFi, comprise following key step:
Steps A, during starting up, identifies network interface card automatically, distinguishes network interface card for dialling and for the shared network interface card of WiFi;
Step B, obtains each network interface card information, comprises network interface card quantity, each network interface card title and their IP address, subnet mask and gateway address;
Step C, offered load equalization algorithm, and carry out Establishment strategy route according to obtained network interface card information, load-balancing algorithm is realized by software programming;
Step D, whether the network interface card that judgement has been dialled breaks, if broken string dials and reconnects, if do not break, continues to carry out downwards;
Step e, the situation of change of judgement network interface card information, if change, automatic updating strategy route, if do not change, waits for after 20 seconds, then jumps to step D and judge;
By above five key steps, finally make wireless many nets merge more intelligent.
2. wireless many network anastomosing methods as claimed in claim 1, it is characterized in that: described in step B by the establishment of software programming implementation strategy route, at user's space, write a software kit, and carry out routing rule in dynamic-configuration linux system router with this software kit, and packet is carried out to mark and processing, move this software kit, automatic construction strategy route, according to the variation of the network interface card information tactful route that upgrades in time.
3. wireless many network anastomosing methods as claimed in claim 2, it is characterized in that: described by the establishment of software programming implementation strategy route, according to the size of the network interface card flow counting, realize equally loaded, each is all to select the network interface card of flow minimum as final outlet, and the network interface card of selecteed minimum discharge can not occur congested; If occur congestedly, this network interface card is got rid of, again in residue network interface card, continue to select the network interface card of flow minimum as online outlet; Statistic frequency is statistics per second 1 time, and all network interface cards that dialled and can work all need statistics, finally each network interface card flow is contrasted and select the minimum network interface card of flow, and usings the outlet of the minimum network interface card of this flow as new initiation session.
4. wireless many network anastomosing methods as claimed in claim 3, is characterized in that: in the workflow of tactful route, when there is the new session of initiating, first, add up the flow of all dialing network interface cards and select a flow minimum and have a network interface card of remaining bandwidth value; Secondly, in this session, first packet carries out before route selection, for this packet and under it in session subsequently all packet the mark value of corresponding outlet network interface card is set; Again, according to the mark value of packet, select corresponding routing table and route entry; Finally, after packet routing completes, carry out network address translation, realize the conversion of the outside net address of internal address.
5. wireless many network anastomosing methods as claimed in claim 1, is characterized in that: described 3G network interface card comprises isomorphism network interface card and isomery network interface card, comprise WCDMA card, CDMA2000 card, TD-SCDMA card.
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