CN105792295A - Virtual fast switching method for wireless Mesh network based on dynamic cluster - Google Patents
Virtual fast switching method for wireless Mesh network based on dynamic cluster Download PDFInfo
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- CN105792295A CN105792295A CN201610119891.1A CN201610119891A CN105792295A CN 105792295 A CN105792295 A CN 105792295A CN 201610119891 A CN201610119891 A CN 201610119891A CN 105792295 A CN105792295 A CN 105792295A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5007—Internet protocol [IP] addresses
- H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Abstract
The invention discloses a virtual fast switching algorithm for a wireless Mesh network based on a dynamic cluster. The algorithm comprises a Mesh client and a Mesh node. The Mesh client comprises an access module and a data packet module; the access module transmits an access request and updates an MAC address of a default gateway; and the data packet module generates a data packet. The Mesh nodes comprises a dynamic cluster maintenance module, a data multicast group maintenance module, and a data packet routing module; the dynamic cluster maintenance module responds to the access request of the client, constructs a dynamic Mesh access point cluster and exchanges link quality information with the client; the data multicast group maintenance module forwards the data packet for the client; and the data packet routing module establishes a multicast routing. In a movement process of the Mesh client in a wireless Mesh network environment, the Mesh network comprehensively considers the access link quality and the backhaul routing situation by constructing the dynamic cluster, so as to select an optimal access point for the client and realize fast switch of the client. The algorithm can accomplish the fast switch of the mobile Mesh client without modifying a 802.11 device drive.
Description
Technical field
The invention belongs to wireless Mesh netword virtualization field, relate under the scene that a kind of Mesh client moves, the method quickly switching Mesh access point.
Background technology
The Mesh client of wireless Mesh netword needs to set up to associate with Mesh access point just to access Internet, and the selection of access point not only affects the performances such as the throughput of client, end-to-end time delay, also can the performance of whole Mesh network be impacted.The access device of IEEE802.11 standard is by scanning channel signal strength (ReceivedSignalStrengthIndicator, RSSI) the strongest MAP is as most access point, channel is rescaned when RSSI drops to certain threshold value, have ignored the route situation of the load of access point and whole Mesh network, cause that the access point selected not is optimum.Now all access points scanned can be built into a Dynamic Cluster, whole Mesh network is invented an access point.Not only consider the quality of access link, the routing condition that the node being simultaneously also contemplated in Dynamic Cluster closes to Internet, when not revising device drives, it is achieved client selects the access point of the best in a network and completes quickly switching in moving process.
Summary of the invention
Technical problem: the present invention is directed to traditional access point based on RSSI and select to cause the link interruption problem of Mesh client and Mesh network, it is provided that under a kind of wireless Mesh netword environment, the wireless Mesh netword based on Dynamic Cluster virtualizes fast switch over method.
Technical scheme: the present invention is based under wireless Mesh netword environment, it is proposed that based on the fast switch over method of Dynamic Cluster, the method comprises the following steps:
Mesh client:
1-1) AM access module: client periodically sends DHCP request, the access point of operation DHCP service starts the position to client after receiving request to be followed the tracks of；
1-2) packet module: send packet to default gateway with fixed frequency；
Mesh node:
2-1) Dynamic Cluster maintenance module: the access point receiving DHCP request constitutes a dynamic access point bunch, in bunch, member is automatically added to a multicast group, i.e. Dynamic Cluster multicast group, with the form of multicast link quality information of exchange oneself and client in group, on the contrary, a period of time does not receive DHCP request, then automatically exit from Dynamic Cluster multicast group；
2-2) data multicast group maintenance module: the access point in Dynamic Cluster with best link quality is automatically added to a data multicast group, starts to forward data for client, on the contrary, it is judged that the access point that link-quality is not optimum then exits data multicast group；
2-3) packet routing module: after access point receives data, is multicasted to other access points in group, is finally sent to Internet and closes.
Step 1-1 described in Mesh client) in, AM access module is made up of following two parts: (1) DHCP request；(2) ARP receives；Idiographic flow is:
A) Mesh client with passing through periodicity (every 2 seconds) broadcast DHCP request obtains effective IP address, the Mesh access point running DHCP service is its distribution IP address, the IP address of default gateway, rental period according to the MAC Address of client, therefore, IP address and default gateway that all access points return are identical, client thinks only one of which access point all the time, thus realizing the position of Mesh client is followed the tracks of；；
B) when Mesh access point starts to forward data for Mesh client time, actively ARP information, the arp cache that amendment client is local can be sent to client, update the MAC Address of default gateway, it is ensured that the data that client sends can first arrive this access point；
Step 2-1 described in Mesh node) in, Dynamic Cluster maintenance module is made up of following three parts: (1) DHCP service；(2) Clustering Algorithm；(3) Dynamic Cluster multicast group；Idiographic flow is as follows:
A) Mesh access point runs DHCP service, monitors the access request of client, and the Mesh access point receiving DHCP request is automatically added to the Dynamic Cluster of this client, if not receiving request after a period of time again, then automatically exits from Dynamic Cluster；
B) access point in Dynamic Cluster adds multicast group, i.e. a Dynamic Cluster multicast group, the access link quality of the access point measuring customer end of Dynamic Cluster, is judged the access point of the best by Clustering Algorithm, adds data multicast group, starts to forward packet for client；
Step 2 described in Mesh node) in, data multicast group maintenance module is made up of following four parts: (1) data package capture；(2) packet agency；(3) data multicast group；(4) packet forwards；Idiographic flow is as follows:
A) access point of Dynamic Cluster adds data multicast group after judging to have the link-quality of the best, sends actively arp reply to client simultaneously and revises client this locality arp cache, updates the MAC Address of default gateway；
B) access point in data multicast group is that client forwards packet, for up-link (Mesh client sends data), Internet closes the packet receiving the repetition from data multicast group, for downlink (Mesh client receives data), client can receive the packet repeated from data multicast group, member's a period of time of data multicast group does not receive data that client sends or access link quality is not best, then exit multicast group；
C) in order to avoid the multiple access points in data multicast group send the packet repeated, the access point of data multicast group closes (destination address of packet) to Internet and sends a service request information, Internet is closed and is sent service acknowledgement message (ServeConfirmMessage for first access point receiving request, SCM), the Mesh access point receiving request backward sends Service Reject message (ServeDenyMessage, SDM), finally, selecting an access point that time delay is the shortest from data multicast group is client service；
D) in the process that Mesh client moves, Mesh access point is constantly had to add or leave Dynamic Cluster and data multicast group, repeat the selection course of above-mentioned best access point, close when Internet and find that first access point receiving request is not original access point for client service, service acknowledgement message (SCM) can be sent to this access point, send Service Reject message (SDM) to original access point, so can ensure that the access point that only one of which is best all the time is client service.
Initialism illustrates:
RSSIReceivedSignalStrengthIndicator received signal strength
DHCPDynamicHostConfigurationProtocol DHCP
IGWInternetGatewayInternet gateway
ARPAddressResolutionProtocol address resolution protocol
SCMServiceConfirmMessage service acknowledgement message
SDMServiceDenyMessage Service Reject message
NATNetworkAddressTranslation network address translation
Beneficial effect
The present invention breaches 802.11 traditional equipment and causes the drawback of client disconnecting based on RSSI active scan Channel assignment access point, a kind of wireless Mesh netword based on Dynamic Cluster is provided to virtualize fast switch over method, by all access points within the scope of Mesh client communication are formed a Dynamic Cluster, the link-quality with client and the backhaul route closed to Internet are constantly monitored and exchanged to bunch interior all access points, final is Mesh client service by Dynamic Cluster one best access point of selection, thus becoming an access point virtual for whole Mesh Access Network, when not revising device drives, realize the quick switching in wireless Mesh netword of the Mesh client.
Accompanying drawing explanation
Fig. 1 is Mesh client and Mesh node system block diagram.
Fig. 2 is scene graph.
Fig. 3 is Mesh access point state transition diagram
Detailed description of the invention
Below in conjunction with embodiment and Figure of description, technical solution of the present invention is described in detail.
1. the scene of the present invention is as shown in Figure 2；Under this scene, Mesh client passes through camera collection video, is transferred to Internet by Mesh network and closes (video playback end).The time delay playing end to ensure video acquisition end to arrive is minimum, Mesh node periodically reports the routing delay information oneself arriving neighbor node to Mesh network parametric controller, network control platform is saved in local data base the routing iinformation received, the Mesh node receiving access request sends transmission of video request to network control platform, network control platform calculates the Mesh access point that video playback end time delay is minimum, and return service acknowledgement message, the Mesh access point and the client that receive service acknowledgement message are set up and are connected, and start to forward video；
Illustrate:
1) Mesh client: be responsible for the real-time video of collection, compression coding, transmission.
2) Mesh access point: periodically report node and link information to network control platform, forwards video for Mesh client；
3) Mesh network parametric controller: being responsible for monitoring and gather node and the link information of whole Mesh network, the service request for Mesh node selects best route.
4) video playback end: receive video and preserve, decode broadcasting；
2. as it is shown in figure 1, Mesh client operation process is as follows:
1) AM access module: Mesh client with passing through periodicity (every 2 seconds) broadcast DHCP request obtains effective IP address, the Mesh access point running DHCP service is its distribution IP address according to the MAC Address of client, the IP address of default gateway, rental period, therefore, IP address and default gateway that all access points return are identical, client thinks only one of which access point all the time, thus realizing the position of Mesh client is followed the tracks of, when Mesh access point starts to forward data for Mesh client time, actively ARP information can be sent to client, the arp cache that amendment client is local, update the MAC Address of default gateway, ensure that the data that client sends can first arrive this access point；
2) packet module: by Ping message, with fixing frequency sending data bag；
3. as it is shown in figure 1, Mesh access point work process is as follows:
4) Dynamic Cluster maintenance module: Mesh access point runs DHCP service, monitor the access request of client, the Mesh access point receiving DHCP request is automatically added to the Dynamic Cluster of this client, if not receiving request after a period of time again, then automatically exit from Dynamic Cluster, access point in Dynamic Cluster adds a multicast group, i.e. Dynamic Cluster multicast group, the access link quality of the access point measuring customer end of Dynamic Cluster, the access point of the best is judged by Clustering Algorithm, add data multicast group, start to forward packet for client.
null5) data multicast group maintenance module: the access point of Dynamic Cluster adds data multicast group after judging to have the link-quality of the best，Send actively arp reply to client simultaneously and revise client this locality arp cache，Update the MAC Address of default gateway，Access point in data multicast group is that client forwards packet，For up-link (Mesh client sends data)，Internet closes the packet receiving the repetition from data multicast group，For downlink (Mesh client receives data)，Client can receive the packet repeated from data multicast group，Member's a period of time of data multicast group does not receive data that client sends or access link quality is not best，Then exit multicast group，In order to avoid the multiple access points in data multicast group send the packet repeated，The access point of data multicast group closes (destination address of packet) to Internet and sends a service request information，Internet is closed and is sent service acknowledgement message (SCM) for first access point receiving request，The Mesh access point receiving request backward sends Service Reject message (SDM)，Finally，Selecting an access point that time delay is the shortest from data multicast group is client service，In the process that Mesh client moves，Mesh access point is constantly had to add or leave Dynamic Cluster and data multicast group，Repeat the selection course of above-mentioned best access point，Close when Internet and find that first access point receiving request is not original access point for client service，Service acknowledgement message (SCM) can be sent to this access point，Service Reject message (SDM) is sent to original access point，So can ensure that the access point that only one of which is best all the time is client service；
6) packet routing module: after access point receives data, is multicasted to other access points in group, is finally sent to Internet and closes.
As mentioned previously, when not revising any driving, DHCP and ARP protocol is utilized to complete the quick switching to MC.As it is shown on figure 3, access point has four states, idle, wait, competition and service.When access point does not receive client DHCP request, it is in idle condition, waits the access request of client；Receive the DHCP request of client, add Dynamic Cluster multicast group, link exchange quality information, enter waiting state；Judge to have best link-quality, enter race condition, start to forward packet for client；Multiple access points of competition start to send service confirmation request to IGW, after receiving confirmation request, are formally client service, enter service state.
When client accesses Mesh network time, whole access procedure is as follows:
(1) scanning: the starting stage, Mesh network has been deployed complete, access point runs DHCP service process and Spines communication module, enters waiting state.Access point owing to receiving request returns same IP address, gateway address, and therefore client is thought and only existed an access point.
(2) association: client determines to add Wireless Mesh network, broadcast DHCP request, the access point receiving request adds Dynamic Cluster multicast group, in Dynamic Cluster multicast group, the link quality information of access point exchange and client judges that the access point with best link-quality adds data multicast group, enter race condition, actively send ARP resolving information to client and start to forward data for client.Access point does not receive client DHCP request for a long time, automatically exits from Dynamic Cluster multicast group；Judge that link-quality is not best, automatically exit from data multicast group；Enter the access point of race condition, sending service confirmation request to IGW, IGW sends service acknowledgement message (SCM) to the access point being initially received request, and the access point receiving SCM enters service state, actively send ARP information to client, update customer end A RP buffer memory.Internet is closed the access point of the request received backward and is sent Service Reject message (SDM) information, and the access point receiving SDM information directly exits data multicast group.
(3) data communication: for up-link, enter the MAP of service state the data message forwarding of MC to Mesh network, it is ultimately routed to nearest IGW, IGW utilizes NAT (NetworkAddressTranslation, NAT) packet being sent to the Internet, client maintains the relation table of a MC-MAP.For downlink, IGW utilizes the relation table of MC-MAP, the IP address according to destination client, is mapped to the MAP of correspondence, is finally transmitted to client.If over the mobile handoff access point of client, the access point receiving first message is not the access point serviced before, and IGW sends SCM information, updates MC-MAP relation table simultaneously, access point later is sent SDM.
Beneficial effects of the present invention is as follows:
When Mesh client is in wireless Mesh netword environment in moving process, access link quality and backhaul routing condition is considered by building Dynamic Cluster by Mesh network, the access point of the best and the access point that time delay is the shortest is selected for client, realize the quick switching of client, from the angle that client is single, whole Mesh network is virtual becomes an access point, thinks all the time and is connected to same access point.
Claims (4)
1. the wireless Mesh netword based on Dynamic Cluster virtualizes quick handoff algorithms, it is characterised in that the method includes Mesh client and Mesh node step:
Mesh client:
1-1) AM access module: client periodically sends DHCP information request, the access point of operation DHCP service starts the position to client after receiving request to be followed the tracks of；
1-2) packet module: send packet to default gateway with fixed frequency；
Mesh node:
2-1) Dynamic Cluster maintenance module: the access point receiving DHCP request constitutes a dynamic access point bunch, in bunch, member is automatically added to a multicast group, i.e. Dynamic Cluster multicast group, with the form of multicast link quality information of exchange oneself and client in group, on the contrary, a period of time does not receive DHCP request, then automatically exit from Dynamic Cluster multicast group；
2-2) data multicast group maintenance module: the access point in Dynamic Cluster with best link quality is automatically added to a data multicast group, starts to forward data for client, on the contrary, it is judged that the access point that link-quality is not optimum then exits data multicast group；
2-3) packet routing module: after access point receives data, is multicasted to other access points in group, is finally sent to Internet and closes (InternetGateway, IGW).
2. the wireless Mesh netword based on Dynamic Cluster according to claim 1 virtualizes fast switch over method, it is characterised in that step 1-1 described in Mesh client) in, AM access module is made up of following two parts: (1) DHCP request；(2) ARP receives, and idiographic flow is:
A) Mesh client obtains effective IP address by periodically broadcast DHCP request, the Mesh access point running DHCP service is its distribution IP address, the IP address of default gateway, rental period according to the MAC Address of client, therefore, IP address and default gateway that all access points return are identical, client thinks only one of which access point all the time, thus realizing the position of Mesh client is followed the tracks of；
B) when Mesh access point starts to forward data for Mesh client time, actively ARP information, the arp cache that amendment client is local can be sent to client, update the MAC Address of default gateway, it is ensured that the data that client sends can first arrive this access point.
3. the wireless Mesh netword based on Dynamic Cluster according to claim 1 virtualizes fast switch over method, it is characterised in that step 2-1 described in Mesh node) in, Dynamic Cluster maintenance module is made up of following three parts: (1) DHCP service；(2) Clustering Algorithm；(3) Dynamic Cluster multicast group, idiographic flow is as follows:
A) Mesh access point runs DHCP service, monitors the access request of client, and the Mesh access point receiving DHCP request is automatically added to the Dynamic Cluster of this client, if not receiving request after a period of time again, then automatically exits from Dynamic Cluster；
B) access point in Dynamic Cluster adds a multicast group, i.e. Dynamic Cluster multicast group, the access link quality of the access point measuring customer end of Dynamic Cluster, judge, by Clustering Algorithm, the access point that time delay is the shortest, add data multicast group, start to forward packet for client.
4. the wireless Mesh netword based on Dynamic Cluster according to claim 1 virtualizes fast switch over method, it is characterized in that, step 2-2 described in Mesh node) in, data multicast group maintenance module is made up of following four parts: (1) data package capture；(2) packet agency；(3) data multicast group；(4) packet forwards, and idiographic flow is as follows:
A) access point of Dynamic Cluster adds data multicast group after judging to have the link-quality of the best, sends actively arp reply to client simultaneously and revises client this locality arp cache, updates the MAC Address of default gateway；
B) access point in data multicast group is that client forwards packet, for up-link, Internet closes the packet receiving the repetition from data multicast group, for downlink, client can receive the packet repeated from data multicast group, member's a period of time of data multicast group does not receive data that client sends or access link quality is not best, then exit multicast group；
C) in order to avoid the multiple access points in data multicast group send the packet repeated, the access point of data multicast group closes to Internet and sends a service request information, Internet is closed and is sent service acknowledgement message for first access point receiving request, the Mesh access point receiving request backward sends Service Reject message, finally, selecting an access point that time delay is the shortest from data multicast group is client service；
D) in the process that Mesh client moves, Mesh access point is constantly had to add or leave Dynamic Cluster and data multicast group, repeat the selection course of above-mentioned best access point, close when Internet and find that first access point receiving request is not original access point for client service, service acknowledgement message SCM can be sent to this access point, send Service Reject message SDM to original access point, so can ensure that only one of which access point is client service all the time.
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| CN114301784A (en) * | 2021-12-09 | 2022-04-08 | 中国国家铁路集团有限公司 | Network shooting range training environment construction method and device, electronic equipment and storage medium |
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