CN105188103A - Rapid roaming optimization method for use in MESH network routing protocol - Google Patents
Rapid roaming optimization method for use in MESH network routing protocol Download PDFInfo
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- CN105188103A CN105188103A CN201510489824.4A CN201510489824A CN105188103A CN 105188103 A CN105188103 A CN 105188103A CN 201510489824 A CN201510489824 A CN 201510489824A CN 105188103 A CN105188103 A CN 105188103A
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- access point
- wireless access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
Abstract
The invention discloses a rapid roaming optimization method for use in a MESH network routing protocol. According to the implementation scheme, the method comprises the following steps that: after a client C enters a roaming state and a first wireless access point AP1 receives a roaming notification sent by a second wireless access point AP2, the first wireless access point AP1 immediately forwards a received data packet to the second wireless access point AP2, deletes an address of the client C in a local conversion table of the first wireless access point AP1, and adds a current address of the client C into a global conversion table; the first wireless access point AP1 transmits a broadcast packet with a roaming banner at a next time interval in order that other nodes in a network can be informed that the client C is at a roaming stage currently; and the second wireless access point AP2 transmits the broadcast packet and informs the other nodes in the network of information indicating that connection is established between the client C and the second wireless access point AP2, and the other nodes in the network establish an optimal link according to the MESH network routing protocol. Through adoption of the method, the problem of large packet loss number due to long time delay in address update waiting of a wireless access point (AP) in a current roaming process is solved.
Description
Technical field
The invention belongs to communication technical field, particularly relate to a kind of fast roaming optimization method, can be used for the improvement of MESH network Routing Protocol.
Background technology
In the Wireless MESH network that there is multiple client C, proactive agreement is usually adopted to carry out addressing and route.Proactive agreement periodically sends detection packet and calculates best lower jumping route, and this Cycle Length is called a detection packet interval, can greatly reduce the time delay that network sets up initial stage generation like this.Typical proactive agreement has BATMAN and OLSR.Proactive agreement comprises the detection packet of routing iinformation by the mechanism transmission of inundation, each wireless access point AP, according to detection packet information acquisition routing table, calculates Optimization route.
In MESH network, client C has mobility.In actual applications, client C can be linked into different wireless access point AP and produce roaming behavior in moving process.When a client C moves, wireless controller AC, must wait for that new message is to determine the current residing position of client C.This process can produce one section of time delay, and the length of this time delay depends on topological structure.In this section of time delay, when wireless access point AP finds that it disconnects with client C, then wireless controller AC to be sent to the data packet discarding of client C.Namely when mobile node enters roaming, node can be moved with the disconnection in network between each node with re-establish the process be connected, this process can cause communication delay, thus cause the loss of packet, see " computer engineering and science " the 26th volume o. 11th article " a kind of Mobile IP mobility fast handover scheme based on WLAN (wireless local area network) " in 2004.As can be seen here, in MESH network, the routing update time delay that the roaming behavior of mobile node produces is larger, causes packet loss number to increase, reduces the transmission performance of system.
Summary of the invention
The object of the invention is to be to propose the fast roaming optimization method in a kind of MESH network Routing Protocol, too large to solve the medium time delay to be updated of roam procedure, cause the problem that packet loss number increases, improve the transmission performance of system.
For achieving the above object, technical scheme of the present invention comprises as follows:
(1) roaming is entered: when client C roams into the second wireless access point AP 2 from the first wireless access point AP 1, disconnect the connection with the first wireless access point AP 1, set up the connection with the second wireless access point AP 2, and send the notice that client C enters roaming to the first wireless access point AP 1 by the second wireless access point AP 2;
(2) first wireless access point AP 1 receive roaming and notice, and proceed as follows:
First wireless access point AP 1 receive roaming notice after, the packet of client C will be sent to by wireless controller AC to be immediately transmitted to the second wireless access point AP 2, by the second wireless access point AP 2 by data packet transmission to client C;
First wireless access point AP 1 deletes the address of client C in the local translation table of himself, and joins in global transformation table by the address of active client C;
First wireless access point AP 1 sends the broadcast packet with Roam Flag at following time interval, the information that in informing network, other node client C has disconnected with the first wireless access point AP 1;
(3) optimum link transmission is set up: the second wireless access point AP 2 sends broadcast packet to the whole network, the information that in informing network, other node client C has connected with oneself, other nodes in network will set up optimum link transmission data according to MESH network Routing Protocol.
Compared with prior art, tool has the following advantages in the present invention:
1. the present invention notices owing to using roaming, make the first wireless access point AP 1 can learn the state information of client C in time, solve in the roam procedure of existing Routing Protocol, first wireless access point AP 1 is oversize because waiting for that the second wireless access point AP 2 sends the time delay of broadcast packet, cannot know the state information of client C in time and cause the problem that packet loss quantity is large.
2. the present invention is owing to using pass-through mode, make the first wireless access point AP 1 packet correctly can be transferred to client C by the second wireless access point AP 2, solve current roaming process due to the first wireless access point AP 1 wait for lastest imformation time extend and cause the problem that packet loss quantity is large.
3. the present invention is owing to using Roam Flag, other nodes in network can be learnt, and client C is current is in the roaming stage, solve in current roaming process, nodes because knowing the state information that client C is current in time, and extends and packet loss quantity large problem when causing waiting for lastest imformation.
Accompanying drawing explanation
Fig. 1 is existing MESH network configuration diagram;
Fig. 2 is Fast roaming procedure flow chart of the present invention;
Fig. 3 is Fast roaming procedure schematic diagram of the present invention;
Fig. 4 roams notification data pack arrangement schematic diagram in the present invention;
Fig. 5 is the broadcast packet structural representation with Roam Flag in the present invention;
Fig. 6 is the process schematic carrying out roaming emulation with the present invention and existing loaming method;
Fig. 7 is the Comparative result figure carrying out roaming emulation with the present invention and existing loaming method.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, scheme of the present invention is described in further detail.
The present invention is the optimization to the roam procedure in existing MESH network Routing Protocol.
With reference to Fig. 1, described MESH network is made up of wireless controller AC, wireless access point AP and client C, the wireless access point AP wherein in wireless controller AC control and management MESH network; Wireless access point AP is provided with 3 types: one is by wired WAP (wireless access point) MPP be connected with wireless controller AC, and but two is be connected with MPP do not access the WAP (wireless access point) MP of client C, and three is for client provides the WAP (wireless access point) MAP of access service.The wireless access point AP of this three types constitutes the framework of MESH network, automatically mutually can find and initiate to set up the wireless connections of multi-hop, for client C provides transmission service between wireless access point AP.
With reference to Fig. 2 and Fig. 3, the performing step that the present invention optimizes the fast roaming in described MESH network Routing Protocol is as follows:
Step one: initial condition
Owing to there is wireless controller AC, three wireless access point AP and a client C in MESH network.When client C accesses the first wireless access point AP 1, the transmission path of packet is as follows: Packet Generation is given the 3rd wireless access point AP 3 by wireless controller AC, data packet transmission is given the first wireless access point AP 1 by the 3rd wireless access point AP 3, by the first wireless access point AP 1 by data packet transmission to client C, as shown in Fig. 3 (a).
Step 2: enter roaming
Client C roams into the second wireless access point AP 2 from the first wireless access point AP 1, client C and the first wireless access point AP 1 disconnect, because the first wireless access point AP 1 cannot learn the address that client C is current, wireless controller AC sends to the packet of client C will be dropped, as shown in Fig. 3 (b);
Step 3: send roaming and notice
When the second wireless access point AP 2 detects client C, send roaming to the first wireless access point AP 1 immediately to notice, needs one section of communication delay is noticed because the first wireless access point AP 1 receives roaming, during this period of time, the data packet discarding that first wireless access point AP 1 will receive, as shown in Fig. 3 (c);
Described roaming is noticed, and is a kind of new packet, in this packet, using the address of the first wireless access point AP 1 as destination address, using the address of the second wireless access point AP 2 as transmission address, and carries the address of active client C in packet; Being noticed by roaming makes the first wireless access point AP 1 can learn the state information of client C in time, avoids data to abandon.
With reference to Fig. 4, the packet that roaming is noticed comprises Packet_Type, Vertion, Destination_Address, TTL, Source_Address and Client_Address six parts, wherein:
Packet_Type: represent type of data packet, this roaming notification data Packet type is Link State data of description bag;
Vertion: the version compatibility being MESH network Routing Protocol;
Destination_Address: the address being the first wireless access point AP 1, using the address of the first wireless access point AP 1 as the destination address of roaming notification data bag;
TTL: be the value that MESH network Routing Protocol presets, represent the life span of this roaming notification data bag, if the ttl value of the roaming notification data bag that wireless access point AP receives has exceeded this ttl value preset, then wireless access point AP has thought that this packet is invalid;
Source_Address: the address being the second wireless access point AP 2, using the address of the second wireless access point AP 2 as the transmission address of roaming notification data bag;
Client_Address: the physical address being roaming client C.
Step 4: the first wireless access point AP 1 receives roaming and notices.
First wireless access point AP 1 proceeds as follows after receiving roaming notice respectively:
One is between the first wireless access point AP 1 and the second wireless access point AP 2, set up a temporary link immediately, Packet Generation is given the first wireless access point AP 1 by wireless controller AC, packet is transmitted to the second wireless access point AP 2 by the first wireless access point AP 1, again by the second wireless access point AP 2 by data packet transmission to client C, now, the first wireless access point AP 1 no longer packet loss;
Two is the addresses of deleting client C in himself local translation table, is joined the address of active client C in global transformation table;
Three is send with the broadcast packet of Roam Flag at following time interval, and other nodes in MESH network can be learnt, and client C is current is in the roaming stage, as shown in Fig. 3 (d).
Described local translation table, it is the data link table that in MESH network, each wireless access point AP has, comprise address information and routing iinformation that this wireless access point AP self connects client C in table, MESH network Routing Protocol calculates the routed path of the client C that himself connects according to the information in the local translation table of wireless access point AP.
Described global transformation table, it is the data link table that in MESH network, each node has, table comprises address information and the routing iinformation of other the client C beyond the client C of removing this wireless access point AP self connection, and MESH network Routing Protocol calculates the routed path of all client C according to the local translation table of wireless access point AP and global transformation table.
The described broadcast packet with Roam Flag, is add a Roam Flag in original broadcast packet, and carries the lastest imformation of the physical address of client C in this bag; In network, other nodes can obtain the lastest imformation of the physical address of client C from broadcast packet, and by using Roam Flag, other nodes in network can be learnt, and client C is current is in the roaming stage.
With reference to Fig. 5, with the broadcast packet of Roam Flag, comprise Packet_Type, Version, TTL, Flags, Sequence_Number, Originator_Address, Previous_Sender, GW_Flags, TQ, TT_Num_Changes, TT_CRC, Roaming_Flags and TT_Change_List 13 parts, wherein:
Packet_Type: represent type of data packet should be Link State data of description bag with the broadcast packet type of Roam Flag;
Version: the version compatibility being MESH network Routing Protocol;
TTL: be the value that MESH network Routing Protocol presets, represent this life span with the broadcast packet of Roam Flag, if the ttl value of the broadcast packet with Roam Flag that wireless access point AP receives has exceeded this ttl value preset, then wireless access point AP has thought that this broadcast packet is invalid;
Flags: the flag bit being MESH network Routing Protocol, indicates that this bag is broadcast packet;
Sequence_Number: represent sending sequence number of this broadcast packet with Roam Flag;
Originator_Address: represent the address of node sending this broadcast packet at first;
Previous_Sender: the upper hop node representing this broadcast packet of transmission;
GW_Flags: be the gateway mark in MESH network Routing Protocol, represent the network segment belonging to this wireless access point AP;
TQ: represent transmission quality, weigh the quality of whole transmission path;
TT_Num_Changes: the number representing the client C changed in local translation table;
TT_CRC: represent the error checking and correction position in MESH network Routing Protocol, effect is transfer of data error detection;
Roaming_Flags: represent Roam Flag, other nodes in network can be learnt, and client C is current is in the roaming stage;
TT_Change_List: represent all addresses of the client C changed in MESH network Routing Protocol and the list of routing iinformation.
Step 5: send broadcast packet
Second wireless access point AP 2 sends broadcast packet, other wireless access point AP in MESH network are learnt, and the position residing for client C is the second wireless access point AP 2, now, wireless controller AC sends to the packet of client C still to use temporary link to transmit, as shown in Fig. 3 (e).
Described broadcast packet, it is a kind of packet that in MESH network, each wireless access point AP periodically sends, bag comprises the address lastest imformation of the client C that wireless access point AP connects and the lastest imformation of routed path, MESH network Routing Protocol according to the local translation table of each wireless access point AP of the information updating comprised in broadcast packet and global transformation table, thus obtains the Optimization route path of client C.
Step 6: set up optimum link
All learn that client C has accessed the situation of the second wireless access point AP 2 according to all wireless access point AP in MESH network, the optimal path then calculating data packet transmission by MESH network Routing Protocol is: Packet Generation is given the 3rd wireless access point AP 3 by wireless controller AC, data packet transmission is given the second wireless access point AP 2 by the 3rd wireless access point AP 3, by the second wireless access point AP 2 by data packet transmission to client C, as shown in Fig. 3 (f), complete the fast roaming optimization in MESH network Routing Protocol.
Effect of the present invention further illustrates by following emulation experiment:
1. experiment condition:
Experimental applications qemu-kvm platform creates the wireless access point AP in virtual machine emulation MESH network, application vde-switch platform simulation wireless medium, the characterisitic parameter of application wirefilter platform simulation wireless connections, as: bandwidth, packet loss and time delay.
2. experiment content:
In emulation experiment, 1,2 ... 100 virtual machines are interconnected with chain structure, represent 1 respectively, 2 ... No. 10 wireless access point AP, in order to contrast the performance difference of common roam procedure and Fast roaming procedure, experimental simulation is when client C roams into the tenth wireless access point AP 10 from the 9th wireless access point AP 9, observe the situation of change of network load, as shown in Figure 6.
3. experimental result:
In the roam procedure of existing MESH network Routing Protocol, when client C roams into the tenth wireless access point AP 10 from the 9th wireless access point AP 9, because the 9th wireless access point AP 9 learns that the new physical address of client C needs one section of communication delay, in the time of this section of about 1.2s, network load vanishing, namely represent that packet continues to lose, as shown in Fig. 7 (a);
And with the fast roaming optimization method in the present invention, when client C roams into the tenth wireless access point AP 10 from the 9th wireless access point AP 9, obvious tomography does not appear in network load, namely packet is not lost in a large number, as shown in Fig. 7 (b).As can be seen here, the fast roaming optimization method in this MESH network Routing Protocol can effectively improve in existing roam procedure because wireless access point AP waits for the problem that the time delay of new address is long and packet loss number that is that cause is excessive.
Above-described embodiment is only for example of the present invention is clearly described, the restriction not to execution mode.For those of ordinary skill in the field, other multi-form change or variations can also be made on the basis of the above description.Here exhaustive without the need to also giving all execution modes, and thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (6)
1. the fast roaming optimization method in MESH network Routing Protocol, is characterized in that, comprise process:
(1) roaming is entered: when client C roams into the second wireless access point AP 2 from the first wireless access point AP 1, disconnect the connection with the first wireless access point AP 1, set up the connection with the second wireless access point AP 2, and send the notice that client C enters roaming to the first wireless access point AP 1 by the second wireless access point AP 2;
(2) first wireless access point AP 1 receive roaming and notice, and proceed as follows:
First wireless access point AP 1 receive roaming notice after, the packet of client C will be sent to by wireless controller AC to be immediately transmitted to the second wireless access point AP 2, by the second wireless access point AP 2 by data packet transmission to client C;
First wireless access point AP 1 deletes the address of client C in the local translation table of himself, and joins in global transformation table by the address of active client C;
First wireless access point AP 1 sends the broadcast packet with Roam Flag at following time interval, the information that in informing network, other node client C has disconnected with the first wireless access point AP 1;
(3) optimum link transmission is set up: the second wireless access point AP 2 sends broadcast packet to the whole network, the information that in informing network, other node client C has connected with oneself, other nodes in network will set up optimum link transmission data according to MESH network Routing Protocol.
2. the fast roaming optimization method in MESH network Routing Protocol according to claim 1, is characterized in that:
Described roaming is noticed, and is a kind of new packet, in this packet, using the address of the first wireless access point AP 1 as destination address, using the address of the second wireless access point AP 2 as transmission address, and carries the address of active client C in packet; Being noticed by roaming makes the first wireless access point AP 1 can learn the state information of client C in time, avoids data to abandon.
3. the fast roaming optimization method in MESH network Routing Protocol according to claim 1, is characterized in that:
Described local translation table is the data link table that in MESH network, each node has, and comprises address information and routing iinformation that this node self connects client C in table.
4. the fast roaming optimization method in MESH network Routing Protocol according to claim 1, is characterized in that:
Described global transformation table is the data link table that in MESH network, each node has, and table comprises address information and the routing iinformation of other the client C beyond the client C of removing this node self connection.
5. the fast roaming optimization method in MESH network Routing Protocol according to claim 1, is characterized in that:
Described broadcast packet is a kind of packet that in MESH network, each node periodically sends, and bag comprises the address lastest imformation of the client C that node connects and the lastest imformation of routed path.
6. the fast roaming optimization method in MESH network Routing Protocol according to claim 1, is characterized in that:
The described broadcast packet with Roam Flag: be add a Roam Flag in original broadcast packet, and carry the lastest imformation of the physical address of client C in this bag; In network, other nodes can obtain the lastest imformation of the physical address of client C from broadcast packet, and by using Roam Flag, other nodes in network can be learnt, and client C is current is in the roaming stage.
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| CN111083055A (en) * | 2019-11-26 | 2020-04-28 | 深圳市共进电子股份有限公司 | Client device management method and device, router and storage medium |
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| CN112566104A (en) * | 2020-12-09 | 2021-03-26 | 深圳创维数字技术有限公司 | Roaming coordination method based on Mesh network, wireless access point and storage medium |
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| CN113473441A (en) * | 2021-06-08 | 2021-10-01 | 北京小米移动软件有限公司 | Data forwarding method and device, node device and storage medium |
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Application publication date: 20151223 |