CN104254110A - Wireless Mesh network inter-domain switching method - Google Patents
Wireless Mesh network inter-domain switching method Download PDFInfo
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Abstract
The invention discloses a wireless Mesh network inter-domain switching method. The method comprises the following steps of enabling an STA (station) to send switching request information to the currently accessed MAP1 (Mesh Access Point 1) from MAP1 and MPP1 (Mesh Portal Point 2) to MPP2; after the STA receives the switching response information of a target IP (internet protocol) address containing STA from the MPP2 and an IP address of the MAP2, disconnecting the STA from the MAP1, entering the area of MPP2, establishing connection with the MAP2, and receiving a data packet 1 and a data packet 2 which are buffered in the MAP2. The method has the advantage that in the switching process, once the target accessing node is determined, a correspondent node is notified by the gateway node in the domain of the original accessing node to send the data into the target accessing node for buffering, so the data loss in the switching process is effectively prevented, the buffered data packet which is sent to the wireless terminal from the original accessed node is minimized, and the switching efficiency is improved.
Description
Technical field
The present invention relates to mobile Internet field, particularly relate to a kind of method for switching among wireless Mesh network fields.
Background technology
Wireless Mesh netword (Wireless Mesh Network, WMN) is the extend type of a kind of WLAN, is the wireless access service that user provides convenience by wireless multi-hop mode, has the advantages such as high bandwidth, high covering, self-organizing and networking flexibility.Along with the development of mobile Internet, dynamically obtain Internet service by different access points (Access Point, AP) in a mobile environment more and more general.The movement of user or the dynamic change of network may cause the new AP of needs to provide access, are not therefore interrupted with guarantee ongoing communication of user in roam procedure in the urgent need to the efficient handover mechanism of one.
For the handover management of WMN, iMesh and MobiMesh, by realizing particular host route in Mesh territory, triggers routing update by node motion, ensures the validity of routing table.But broadcast updating message brings a large amount of expense to network frequently, network scalability is deteriorated.SMesh is a Terminal for service by multicast group, multiple access point simultaneously, and sacrificing bandwidth is that cost ensures the continuous of communication, makes network capacity very limited.More than working is all the handover management of research in a Mesh territory or in network in an existence Mesh gateway situation during fast mobile terminal, move when between generation territory, namely, when terminal switch is to different Mesh gateways, above scheme all can not ensure the Continued communication of user.
When to be switched to Mesh gateway node (MPP2) in the 2nd Mesh territory from the Mesh gateway node (MPP1) in a Mesh territory when wireless terminal (STA), in the forwarding queue of the Mesh access node (MAP1) in a Mesh territory, the data received for wireless terminal (STA) before also having, but once wireless terminal (STA) disconnects with the Mesh access node (MAP1) in a Mesh territory, this wireless terminal (STA) list information is just deleted by the Mesh access node (MAP1) in the one Mesh territory, and the one Mesh access node (MAP1) in Mesh territory do not store the relevant information of the Mesh access node (MAP2) in the 2nd Mesh territory of wireless terminal (STA) access in the future yet, therefore when the packet issuing wireless terminal (STA) arrives Mesh access node (MAP1) in a Mesh territory, Mesh access node (MAP1) in one Mesh territory is packet discard directly, thus cause packet loss phenomenon.
Summary of the invention
Switching problem between the territory that the present invention is directed to wireless Mesh netword, proposes a kind of method for switching among wireless Mesh network fields, when not lost data packets, ensures that wireless terminal STA is switched to the territory of another MPP rapidly from the territory of a MPP.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of method for switching among wireless Mesh network fields, comprises the following steps:
S1: wireless terminal STA determines to switch Target Access Node;
S2:STA determines that switching the rear of Target Access Node MAP2 sends the request message switching wireless Mesh netword territory to former access node MAP1;
Described handover request message is forwarded to the Mesh gateway node MPP1 in territory, MAP1 place by S3:MAP1;
S4:MPP1 sends handover request message to the Mesh gateway node MPP2 in territory, MAP2 place by cable network;
S5:MPP2 sends to switch and prepares message and reserve resource response to MAP2, MAP2 according to the type of service of STA, and sends switching and be ready to complete message to MPP2;
S6:MPP2 is that STA distributes a new IP address, upgrades the address mapping table of oneself simultaneously, and the switching response message returning to the new IP address comprising STA is to MPP1;
After S7:MPP1 receives switching response message, send a handoff notification message to the Correspondent Node CN of STA;
S8: if there is the packet 1 mailing to STA in Correspondent Node CN, then the IP address of Correspondent Node CN MAP2 encapsulates packet 1 as destination address, and the packet 1 that Correspondent Node CN mails to STA is transmitted to MPP2;
S9:MPP2 receives the packet 1 that Correspondent Node CN sends, and is forwarded to MAP2 and carries out buffer memory;
S10:MPP1 upgrades the address mapping table of oneself according to the switching response message that MPP2 returns, and forwards switching response message to MAP1;
After S11:MAP1 forwarding switching response message receives switching response message to STA, STA, send to MAP1 and disconnect request message;
S12:MAP1 checks in the buffer memory of oneself packet 2 whether needing to send to STA in addition; If no, then upgrade the wireless terminal list of oneself, and releasing resource; If any, then more the destination address of new data packets 2 is the new IP address of STA, and forwarding data bag 2 is to MPP1;
S13:MPP1 forwarding data bag 2 is to MPP2, MPP2 forwarding data bag 2 to MAP2;
After S14:MAP1 sends and states packet 2, releasing resource, disconnects the connection with STA, upgrades the wireless terminal list of oneself;
S15:STA sets up the connection with MAP2, upgrades the IP address of oneself, receives packet 1 and the packet 2 of buffer memory in MAP2.
In the present invention, after MPP1 receives switching response message, the packet 1 mailing to mobile terminal STA is sent to MPP2 by notice Correspondent Node CN, and then is transmitted to MAP2 and carries out buffer memory, does like this, obviously can accelerate handoff procedure, if now do not notify Correspondent Node CN, then Correspondent Node CN continues packet 1 to be sent to former access point MAP1, once after mobile terminal is switched to MAP2, by there being more data to need loopback to MAP2 in MAP1, delay handoff procedure.
Wherein, in step S1, wireless terminal determines that the process switching Target Access Node is as follows:
If wireless terminal finds that the access signal quality of former access node is lower than after threshold values, the network interface card of wireless terminal will scan around accessing signal strength signal intensity, by sending probe request, or the beacon frame of receiving target access node determines the good Target Access Node of signal quality, meanwhile, judge whether wireless terminal and Target Access Node are in same territory.
Target Access Node replys probing response frame to wireless terminal after receiving the probe request of the wireless terminal transmission in coverage.
The beacon frame that Target Access Node sends and probing response frame all comprise the MAC Address of this node and the characteristic information in IP address and territory, place.
The wireless terminal list storage of former access node or Target Access Node is provided MAC Address and the IP address of the wireless terminal of service by each access node.
Compared with prior art, the beneficial effect of technical solution of the present invention is: the present invention is in handoff procedure, once after determining Target Access Node, just notify that data are sent to Target Access Node and carry out buffer memory by Correspondent Node by the gateway node in territory, former access node place, this process can ensure that STA is switched to the territory of another MPP rapidly from the territory of a MPP on the one hand, effectively prevent the data packetloss in handoff procedure, also the packet mailing to wireless terminal of former access node buffer memory can be made in addition as far as possible few, improve switching efficiency.
Accompanying drawing explanation
The structural representation of the Wireless Mesh network system that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is schematic flow sheet of the present invention.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described further.
Embodiment 1
As shown in Figure 1, there are 4 category nodes in WMN, Mesh gateway node (Mesh Portal Point, MPP), is the gateway connecting wireless Mesh netword and cable network; Mesh forward node (Mesh Point, MP), sets up wireless link each other to form WMN backbone network between forward node; Mesh access node (Mesh Access Point, MAP), has identical access function with the AP in WLAN, and possesses the function of MP; Wireless terminal (Station, STA), is single mode or multimode terminal, accesses WMN by MAP.Usually by by a MPP and multiple MP(MAP) Mesh network that forms of subsidiary some STA is called a territory, Fig. 1 is the WMN scene comprising 2 territories, is in respectively in the covering of MPP1 and MPP2.
When STA accesses a territory, be assigned with the IP address that a whole network is unique, as the IP address communicated with net outdoor main unit.When STA moves in this domain, IP address keeps inconvenience.When STA moves to another territory, then redistribute an IP address.
WMN, by realizing the forwarding of packet based on 2 layers of retransmission technique of MAC Address, needs MAP to safeguard STA list, stores MAC Address and IP address that this MAP provides service STA in STA list.
Safeguard address mapping table by MPP, store the IP address of STA and MPP and the one-to-one relationship of communication port, and the binding relationship of the MAC Address of the MAC Address of each STA and access MAP.
When STA moves to the coverage of another MPP from the coverage of a MPP, namely MPP there occurs change, at this moment needs to carry out agent update to new MPP.
As shown in Figure 2, a kind of method for switching among wireless Mesh network fields, comprises the following steps:
S1: wireless terminal STA determines to switch Target Access Node;
S2:STA determines that switching the rear of Target Access Node MAP2 sends the request message switching wireless Mesh netword territory to former access node MAP1;
Described handover request message is forwarded to the Mesh gateway node MPP1 in territory, MAP1 place by S3:MAP1;
S4:MPP1 sends handover request message to the Mesh gateway node MPP2 in territory, MAP2 place by cable network;
S5:MPP2 sends to switch and prepares message and reserve resource response to MAP2, MAP2 according to the type of service of STA, and sends switching and be ready to complete message to MPP2;
S6:MPP2 is that STA distributes a new IP address, upgrades the address mapping table of oneself simultaneously, and the switching response message returning to the new IP address comprising STA is to MPP1;
After S7:MPP1 receives switching response message, send a handoff notification message to the Correspondent Node CN of STA;
S8: if there is the packet 1 mailing to STA in Correspondent Node CN, then the IP address of Correspondent Node CN MAP2 encapsulates packet 1 as destination address, and the packet 1 that Correspondent Node CN mails to STA is transmitted to MPP2;
S9:MPP2 receives the packet 1 that Correspondent Node CN sends, and is forwarded to MAP2 and carries out buffer memory;
S10:MPP1 upgrades the address mapping table of oneself according to the switching response message that MPP2 returns, and forwards switching response message to MAP1;
After S11:MAP1 forwarding switching response message receives switching response message to STA, STA, send to MAP1 and disconnect request message;
S12:MAP1 checks in the buffer memory of oneself packet 2 whether needing to send to STA in addition; If no, then upgrade the wireless terminal list of oneself, and releasing resource; If any, then more the destination address of new data packets 2 is the new IP address of STA, and forwarding data bag 2 is to MPP1;
S13:MPP1 forwarding data bag 2 is to MPP2, MPP2 forwarding data bag 2 to MAP2;
After S14:MAP1 sends and states packet 2, releasing resource, disconnects the connection with STA, upgrades the wireless terminal list of oneself;
S15:STA sets up the connection with MAP2, upgrades the IP address of oneself, receives packet 1 and the packet 2 of buffer memory in MAP2.
In the present embodiment, after MPP1 receives switching response message, the packet 1 mailing to mobile terminal STA is sent to MPP2 by notice Correspondent Node CN, and then is transmitted to MAP2 and carries out buffer memory, does like this, obviously can accelerate handoff procedure, if now do not notify Correspondent Node CN, then Correspondent Node CN continues packet 1 to be sent to former access point MAP1, once after mobile terminal is switched to MAP2, by there being more data to need loopback to MAP2 in MAP1, delay handoff procedure.
Wherein, in step S1, wireless terminal determines that the process switching Target Access Node is as follows:
If wireless terminal finds that the access signal quality of former access node is lower than after threshold values, the network interface card of wireless terminal will scan around accessing signal strength signal intensity, by sending probe request, or the beacon frame of receiving target access node determines the good Target Access Node of signal quality, meanwhile, judge whether wireless terminal and Target Access Node are in same territory.
Target Access Node replys probing response frame to wireless terminal after receiving the probe request of the wireless terminal transmission in coverage.
The beacon frame that Target Access Node sends and probing response frame all comprise the MAC Address of this node and the characteristic information in IP address and territory, place.
The wireless terminal list storage of former access node or Target Access Node is provided MAC Address and the IP address of the wireless terminal of service by each access node.
The corresponding same or analogous parts of same or analogous label;
Describe in accompanying drawing position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as;
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection range that all should be included in the claims in the present invention.
Claims (5)
1. a method for switching among wireless Mesh network fields, is characterized in that, comprises the following steps:
S1: wireless terminal STA determines to switch Target Access Node;
S2:STA determines that switching the rear of Target Access Node MAP2 sends the request message switching wireless Mesh netword territory to former access node MAP1;
Described handover request message is forwarded to the Mesh gateway node MPP1 in territory, MAP1 place by S3:MAP1;
S4:MPP1 sends handover request message to the Mesh gateway node MPP2 in territory, MAP2 place by cable network;
S5:MPP2 sends to switch and prepares message and reserve resource response to MAP2, MAP2 according to the type of service of STA, and sends switching and be ready to complete message to MPP2;
S6:MPP2 is that STA distributes a new IP address, upgrades the address mapping table of oneself simultaneously, and the switching response message returning to the new IP address comprising STA is to MPP1;
After S7:MPP1 receives switching response message, send a handoff notification message to the Correspondent Node CN of STA;
S8: if there is the packet 1 mailing to STA in Correspondent Node CN, then the IP address of Correspondent Node CN MAP2 encapsulates packet 1 as destination address, and the packet 1 that Correspondent Node CN mails to STA is transmitted to MPP2;
S9:MPP2 receives the packet 1 that Correspondent Node CN sends, and is forwarded to MAP2 and carries out buffer memory;
S10:MPP1 upgrades the address mapping table of oneself according to the switching response message that MPP2 returns, and forwards switching response message to MAP1;
After S11:MAP1 forwarding switching response message receives switching response message to STA, STA, send to MAP1 and disconnect request message;
S12:MAP1 checks in the buffer memory of oneself packet 2 whether needing to send to STA in addition; If no, then upgrade the wireless terminal list of oneself, and releasing resource; If any, then more the destination address of new data packets 2 is the new IP address of STA, and forwarding data bag 2 is to MPP1;
S13:MPP1 forwarding data bag 2 is to MPP2, MPP2 forwarding data bag 2 to MAP2;
After S14:MAP1 sends and states packet 2, releasing resource, disconnects the connection with STA, upgrades the wireless terminal list of oneself;
S15:STA sets up the connection with MAP2, upgrades the IP address of oneself, receives packet 1 and the packet 2 of buffer memory in MAP2.
2. method for switching among wireless Mesh network fields according to claim 1, is characterized in that, in described step S1, wireless terminal determines that the process switching Target Access Node is as follows:
If wireless terminal STA finds that the access signal quality of former access node is lower than after threshold values, the network interface card of wireless terminal STA will scan around accessing signal strength signal intensity, by sending probe request, or the beacon frame of receiving target access node determines the good Target Access Node of signal quality, meanwhile, judge whether wireless terminal and Target Access Node are in same territory.
3. method for switching among wireless Mesh network fields according to claim 2, is characterized in that, Target Access Node replys probing response frame to wireless terminal after receiving the probe request of the wireless terminal transmission in coverage.
4. method for switching among wireless Mesh network fields according to claim 3, is characterized in that, the beacon frame that Target Access Node sends and probing response frame all comprise the MAC Address of this node and the characteristic information in IP address and territory, place.
5. method for switching among wireless Mesh network fields according to claim 1, is characterized in that, the wireless terminal list storage of former access node or Target Access Node is provided MAC Address and the IP address of the wireless terminal of service by each access node.
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| WO2016155114A1 (en) * | 2015-04-02 | 2016-10-06 | 宇龙计算机通信科技(深圳)有限公司 | Method and device for mobility management of terminal |
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| CN107666694B (en) * | 2016-07-29 | 2020-04-28 | 华为技术有限公司 | Method for switching among distributed APs and related equipment thereof |
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| CN106304119B (en) * | 2016-08-22 | 2023-10-13 | 浙江水木物联技术有限公司 | Wi-Fi coverage system and method based on wireless multi-hop self-organizing network |
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| CN107592375A (en) * | 2017-09-14 | 2018-01-16 | 四川省电科互联网加产业技术研究院有限公司 | A kind of water resource parameter acquisition devices and method for smart city system |
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| CN113099503A (en) * | 2021-03-24 | 2021-07-09 | 网经科技（苏州）有限公司 | Roaming switching method in multi-set wireless mesh network |
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Application publication date: 20141231 |