CN104010292A - VoWLAN roaming method based on AP assistance - Google Patents
VoWLAN roaming method based on AP assistance Download PDFInfo
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- CN104010292A CN104010292A CN201410268809.2A CN201410268809A CN104010292A CN 104010292 A CN104010292 A CN 104010292A CN 201410268809 A CN201410268809 A CN 201410268809A CN 104010292 A CN104010292 A CN 104010292A
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Abstract
The invention discloses a VoWLAN roaming method based on AP assistance. The method comprises the following steps that (1), the IP address of a mobile terminal is unchanged in the roaming process; (2), the signal strength of the mobile terminal is used as a switching trigger condition, and an AP initiates a disconnection operation to assist in switching; (3), one node of a Mesh network is used as an MAC-IP server, and the MAC-IP corresponding relation of the whole network is provided; (4), message content is used as the basis of updating a router in the Mesh nodes and an MAC-IP server communication mechanism. According to the method, any modification and SIP service compatibility are not carried out on an existing mobile terminal, the Mesh network is used as the basis, the AP assists in roaming of the mobile terminal, and the roaming method is low in cost, easy to implement and small in switching delay.
Description
Technical field
The invention belongs to radio network technique field, be specifically related to a kind of based on the auxiliary VoWLAN loaming method of AP (Access Point).
Technical background
In current IT industry field, WLAN and VoIP are the focuses that people pay close attention to, and therefore use WLAN to provide the terminal equipment of voice service (VoWLAN) also just to arise at the historic moment.VoWLAN is one of emerging application of WLAN.VoIP is by data network transmission voice signal; WLAN(WLAN (wireless local area network)), by WAP (wireless access point), get online without being tethered to a cable.VoWLAN can be described as the two combination, it can utilize existing wlan network to realize wireless VoIP delivery value, enterprise staff is place voice communication at any time, access E-mail and other Internet resources that accessed beyond can be in office space by VoWLAN, improve like this utilance of Internet resources and reduced the cost of conversing, thereby saved the overall IT expense of enterprise.For residential customer, also can reduce telephone expenses by the voip phone being connected with broadband 802.11 wireless networks.
VoWLAN is equally used packet switching with VoIP, and speech data rate is lower but quality can not get guarantee.When terminal is when the diverse access point of consolidated network inside is roamed, wlan network handover delay is large, and this has had a strong impact on the development to the high speech business of requirement of real-time.
For the problems referred to above, researcher has proposed multiple solution both at home and abroad.
The feature of one class methods based on 802.11 wireless networks self.The roam procedure of wlan network is generally independently determined by mobile terminal, comprises processes such as disconnecting former connection, scanning channel, authentication, association, pre-registration.The time delay that wherein scan channel produces accounts for 80% left and right of whole roam procedure.Wherein there is certain methods to consider to reduce the spent time of scanning channel by some algorithm, as identified the channel of other AP former AP near by neighbor picture, thereby greatly reduce sweep time.For this reason, many methods, by customization mobile terminal, are optimized channel scan procedure and are reduced roaming time delay.When reducing roaming time delay, customization mobile terminal also brings a huge cost.
Another kind of scheme is based on some specific agreements.Solution based on Mobile IP is utilized its home agent and external agent's collaborative work, by tunneling technique, when roaming, data is delivered to mobile terminal; Scheme based on re-INVITE in Session Initiation Protocol is restarted session by re-establishing the mode of call connection; The roaming problem that provides the 802.11r agreement of quick switching to be also used to solve VoWLAN for wlan network real time communication is provided, and this agreement reduces the handoff procedure time used by allowing mobile subscriber to carry out associated mode with new access point before switching.More have in conjunction with emerging software defined network (Software-Defined Networking, abbreviation SDN) 802.11 mobility fast handover schemes, it utilize the concept of Microsoft Loopback Adapter on a physical equipment, generate can be associated with a plurality of access points virtual radio equipment, and by OpenFlow to the scanning in roam procedure, switching and during data flow control.The feature of these class methods is comparatively novel, but needs the function support of a large amount of convictive experimental results and chip manufacturer.
Therefore, current proposed method all exists time performance period long, needs the shortcoming of enormous expenditure.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention does not make any modification, compatible SIP service to existing mobile terminal.Take Mesh network as basis, and AP auxiliary moving terminal roaming, provides a kind of low expense, and implementation method is simple, the loaming method that handoff delay is less.
The technical solution adopted in the present invention is: a kind ofly based on the auxiliary VoWLAN loaming method of AP, it is characterized in that, comprise the following steps:
Step 1: after mobile terminal is associated with AP, by DHCP, obtain IP address, AP is by monitoring the MAC-IP information of gratuitous ARP acquisition request mobile terminal, and on the node being directly connected with sip server, store this information, this node is as MAC-IP server, other nodes detect gratuitous ARP and inform this node, the information of all mobile terminals in the whole network of MAC-IP server record; In roam procedure, IP address of mobile terminal is constant, and, before leaving this network, mobile terminal keeps this IP address, and mobile terminal networks after restarting again, regains IP;
Step 2: the signal strength signal intensity from mobile terminal receiving by real-time detection AP, repeated detection is averaged, detecting with the communication of mobile terminal Quality Down of current associated AP after reservation threshold, AP sends the Deauthentication frame of forging, and finishes the incidence relation with mobile terminal; Mobile terminal receives after this Deauthentication frame, and with AP disassociation, and the signal strength signal intensity of returning according to Probe frame selects a new AP to carry out association;
Step 3: after the mobile terminal of new AP and roaming is associated, sends and roam message to the MAC-IP server in network, inform that roaming switch has occurred this mobile terminal of MAC-IP server; New AP detects mobile terminal according to 802.11 association response frame, sends to the message of MAC-IP server only to comprise the MAC Address of mobile terminal and up-to-date gateway address, and gateway address is the IP address of new node AdHoc pattern network interface card;
Step 4:MAC-IP server is after receiving roaming message, and the IP address of searching mobile terminal according to MAC Address, upgrades the gateway ip address of this mobile terminal in MAC-IP table when MAC-IP message is informed to new AP;
Step 5: new AP receives after the response message of MAC-IP server, first according to the IP address architecture of mobile terminal, go out its default gateway address, as transmitting terminal IP in ARP, the ARP message of send forging is to mobile terminal, by the upstream voice data new AP self that leads; With stylish AP, other node updates routes in broadcast and unicast messages informing network will be sent respectively, a hop neighbor node for new AP, they can receive the broadcast of new AP, for two hop neighbor nodes and above node, they upgrade route according to the unicast messages of new access point; MAC-IP server upgrades immediately route after receiving roaming message;
Step 6: other nodes in network are after receiving road report message, re-establish one about the route table items of this mobile terminal, when receiving that while mailing to the downlink voice data of this mobile terminal from sip server, other nodes forward according to this route table items; Because the IP address of mobile terminal and the IP of its new AP be not in same subnet, new AP is also by route table items of interpolation, thereby finally gives mobile terminal by the downlink voice data of receiving.
As preferably, when again there is roaming switch in mobile terminal, except above-mentioned steps, the previous associated nodes of mobile terminal also needs to delete the route table items about this mobile terminal, delete the process of route table items by MAC-IP server triggers, by sending a piece of news to origin node, realize.
As preferably, the process of establishing of the MAC-IP information described in step 1 is: after mobile terminal is associated with AP, by DHCP, obtain IP address, and send Gratuitous ARP, AP monitors the MAC-IP information that Gratuitous ARP obtains mobile terminal, on the node being directly connected with sip server, store this information, this node is as MAC-IP server, other nodes detect this node of MAC-IP information notification that Gratuitous ARP obtains, and MAC-IP server record has the MAC-IP information of all mobile terminals in whole network.
As preferably, the new AP described in step 2, is maximum one of Probe frame inverse signal intensity, and mobile terminal selects the process of new AP associated not intervene.
As preferably, the notice flow process of the roaming message described in step 3 is: whether new AP detects mobile terminal according to 802.11 Associatiojn Response frames associated, new AP detect associated with the mobile terminal of roaming after, MAC-IP server in network sends roaming message, inform that roaming switch has occurred this mobile terminal of MAC-IP server, send to the message of MAC-IP server only to comprise the MAC Address of roaming mobile terminal and up-to-date gateway address, gateway address is the IP address of new node AdHoc pattern network interface card.
As preferably, the new AP described in step 5 receives after the response message of MAC-IP server, first according to the IP address architecture of mobile terminal, goes out its default gateway address, and its default gateway address is the IP address that in same subnet, last byte is 1.
As preferably, the discriminating conduct of the hop neighbor node described in step 5 and multi-hop neighbor node is in a Mesh network, the route table items that node produces according to olsrd is judged its and is jumped and multi-hop neighbor node, the gateway of all hop nodes is the IP address of full 0, without other nodes, forwards.
Innovative point of the present invention is:
1) in roam procedure, IP address of mobile terminal is constant;
2) with mobile terminal signal intensity as handover triggering condition, AP initiate to disconnect join operation, auxiliary switching;
3) one of them node of Mesh network, as MAC-IP server, provides the MAC-IP corresponding relation of whole network;
4) Mesh node and MAC-IP server communication mechanism, using message content as the foundation of upgrading route.
The present invention does not make any modification, compatible SIP service to existing mobile terminal.Take Mesh network as basis, and AP auxiliary moving terminal roaming, is a kind of low expense, and implementation method is simple, the loaming method that handoff delay is less.
Accompanying drawing explanation
Accompanying drawing 1: be embodiment of the present invention Scene simplified diagram.
Accompanying drawing 2: be MAC-IP process of establishing figure in the embodiment of the present invention.
Accompanying drawing 3: be the notice flow process of roaming message in the embodiment of the present invention.
Accompanying drawing 4: be entire system method in the embodiment of the present invention.
Accompanying drawing 5: be MAC-IP message and roaming message format in the embodiment of the present invention.
Accompanying drawing 6: the message format that is roaming response in the embodiment of the present invention.
Accompanying drawing 7: be routing update message form in the embodiment of the present invention.
Accompanying drawing 8: be MAC-IP message and the handling process of roaming message in the embodiment of the present invention.
Embodiment
For the ease of those of ordinary skills, understand and enforcement the present invention, below in conjunction with drawings and Examples, the present invention is described in further detail, should be appreciated that exemplifying embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
Asking for an interview Fig. 1, is embodiment of the present invention Scene simplified diagram, wherein comprises 3 Wireless Mesh nodes and a sip server main frame, and mobile terminal does not draw in the drawings.Three Wireless Mesh nodes are all equipped with two wireless network cards except node 1, and one is operated in ap mode, for mobile terminal access; Another piece is operated in AdHoc pattern, for setting up Mesh backbone network.All working has identical SSID at the network interface card of ap mode, and adjacent two internodal wireless access signals coverings have overlapping.And wired network interface of each node is by together with being operated in the wireless network card bridge joint of ap mode.
Ask for an interview Fig. 2, Fig. 3 and Fig. 4, the technical solution adopted in the present invention is: a kind of based on the auxiliary VoWLAN loaming method of AP, comprise step:
Step 1: after mobile terminal is associated with AP, obtain IP address by DHCP.AP passes through to monitor the MAC-IP information of gratuitous ARP acquisition request mobile terminal, and stores this information on the node 1 being directly connected with sip server.Node 1 is as MAC-IP server, and other nodes detect gratuitous ARP and inform node 1.MAC-IP server record has the information of all mobile terminals in whole network.In roam procedure, IP address of mobile terminal is constant, and, before leaving this network, mobile terminal keeps this IP address.Mobile terminal networks after restarting again, regains IP.
Step 2: the signal strength signal intensity from mobile terminal receiving by real-time detection AP, repeated detection is averaged.Detecting with the communication of mobile terminal Quality Down of current associated AP after reservation threshold, AP sends the Deauthentication frame of forging, and finishes the incidence relation with mobile terminal.Mobile terminal receives after this Deauthentication frame, and with AP disassociation, and the signal strength signal intensity of returning according to Probe frame selects a new AP to carry out association.Here the new AP selecting is maximum one of Probe frame inverse signal intensity.Mobile terminal selects the process of new AP associated not intervene.
Step 3: after the mobile terminal of new AP and roaming is associated, sends and roam message to the MAC-IP server in network, inform that roaming switch has occurred this mobile terminal of MAC-IP server; New AP detects mobile terminal according to 802.11 association response frame, sends to the message of MAC-IP server only to comprise the MAC Address of mobile terminal and up-to-date gateway address, and gateway address is the IP address of new node AdHoc pattern network interface card.
Step 4:MAC-IP server is after receiving roaming message, and it will search the IP address of mobile terminal according to MAC Address, upgrades the gateway ip address of this mobile terminal in MAC-IP table when MAC-IP message is informed to new AP.
Step 5: new AP receives after the response message of MAC-IP server, first according to the IP address architecture of mobile terminal, go out its default gateway address (the IP address that in same subnet, last byte is 1), as transmitting terminal IP in ARP, the ARP message of send forging is to mobile terminal, by the upstream voice data new AP self that leads.With stylish AP, other node updates routes in broadcast and unicast messages informing network will be sent respectively.For a hop neighbor of new AP, they can receive the broadcast of new AP; For 2 jumpings and above node, they upgrade route according to the unicast messages of new access point.In a Mesh network, the route table items that node can produce according to olsrd is judged its and is jumped and multi-hop neighbor node, and the IP address that the gateway of all hop nodes is full 0 forwards without other nodes.MAC-IP server upgrades immediately route after receiving roaming message.
Step 6: other nodes in network, after receiving road report message, re-establish one about the route table items of this mobile terminal.When receiving that while mailing to the downlink voice data of this mobile terminal from sip server, other nodes will forward according to this route table items; Because the IP address of mobile terminal and the IP of its new AP be not in same subnet, new AP is also by route table items of interpolation, thereby finally gives mobile terminal by the downlink voice data of receiving.
Step 7: when mobile terminal again roaming switch occurs, except above step, the previous associated nodes of mobile terminal also needs to delete the route table items about this mobile terminal.Therefore in the design, delete the process of route table items or by MAC-IP server triggers, realize by sending a piece of news to origin node.
Asking for an interview Fig. 5, is MAC-IP message and roaming message format in the embodiment of the present invention.MAC-IP server records its MAC-IP information and gateway address after mobile terminal adds network; When terminal generation roaming switch, the roaming message of the current associated nodes of MAC-IP response mobile terminal.The two adopts identical message format.As shown in Figure 5.Gateway field is the IP address of AdHoc pattern network interface card on Mesh node; The MAC Address that customer information comprises mobile terminal and current IP address.Last word is saved in the source of distinguishing message, judges that it is that 802.11 association response frame during by mobile terminal gratuitous ARP or roaming produce.
Asking for an interview Fig. 6, is the message format of roaming response in the embodiment of the present invention.After receiving roaming message, MAC-IP server sends response message to the current associated nodes of mobile terminal, notifies it to do further route messages notice and route interpolation work.Fig. 6, for the message format of roaming response, comprises routing iinformation, mac address information and identification information.Intactly by roaming, the gateway address in message, the MAC Address of mobile terminal copy MAC-IP server, and carry the IP address of mobile terminal and the current associated nodes that two one-byte field send to mobile terminal.Ops field represents to receive the operation that this message posterior nodal point should be taked---and add or delete route.ARP Flag field is used for showing whether node needs auxiliary moving terminal to upgrade ARP, only receives that ARP message that the node of roaming response message just need to send forgery is to terminal.
Asking for an interview Fig. 7, is routing update message form in the embodiment of the present invention.Comprise routing iinformation and a flag information, for distinguishing, delete or add route.Route messages itself has divided for two classes---broadcast and unicast messages.Broadcast is used for notifying a hop neighbor node, and multi-hop node is notified with unicast messages.
Asking for an interview Fig. 8, is MAC-IP message and the handling process of roaming message in the embodiment of the present invention.MAC-IP server to the handling process of MAC-IP message and roaming message as shown in Figure 8.First be to distinguish IMAC-IP message and roaming message., mobile terminal overflows or networks and all produce this message first.If roaming generation occurs mobile terminal, MAC-IP server is informed the IP address of terminal the current associated nodes of mobile terminal, and the whole network needs the corresponding route table items upgrading about this mobile terminal; If mobile terminal is to network first, MAC-IP server goes out does not also have the record about it, directly ignores this message; If mobile terminal networks after restarting again, the already present record of MAC-IP server update.
If what receive is an IP-MAC message, MAC-IP server judges in IP-MAC table whether have this message.If do not exist, store this entry; If exist, need to judge its whether with existing record identical.As mobile terminal again starts afterwards and again networks and to produce this message, it has obtained new IP address and has been in the middle of a new subnet.Now, MAC-IP server is notified the current associated nodes of this mobile terminal when upgrading MA-IP information, by this node, informs the existing route about this mobile terminal of the whole network deletion.
Should be understood that, the part that this specification does not elaborate all belongs to prior art.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; can not therefore think the restriction to scope of patent protection of the present invention; those of ordinary skill in the art is under enlightenment of the present invention; do not departing from the scope situation that the claims in the present invention protect; can also make and replacing or distortion, within all falling into protection scope of the present invention, the scope of asking for protection of the present invention should be as the criterion with claims.
Claims (7)
1. based on the auxiliary VoWLAN loaming method of AP, it is characterized in that, comprise the following steps:
Step 1: after mobile terminal is associated with AP, by DHCP, obtain IP address, AP is by monitoring the MAC-IP information of gratuitous ARP acquisition request mobile terminal, and on the node being directly connected with sip server, store this information, this node is as MAC-IP server, other nodes detect gratuitous ARP and inform this node, the information of all mobile terminals in the whole network of MAC-IP server record; In roam procedure, IP address of mobile terminal is constant, and, before leaving this network, mobile terminal keeps this IP address, and mobile terminal networks after restarting again, regains IP;
Step 2: the signal strength signal intensity from mobile terminal receiving by real-time detection AP, repeated detection is averaged, detecting with the communication of mobile terminal Quality Down of current associated AP after reservation threshold, AP sends the Deauthentication frame of forging, and finishes the incidence relation with mobile terminal; Mobile terminal receives after this Deauthentication frame, and with AP disassociation, and the signal strength signal intensity of returning according to Probe frame selects a new AP to carry out association;
Step 3: after the mobile terminal of new AP and roaming is associated, sends and roam message to the MAC-IP server in network, inform that roaming switch has occurred this mobile terminal of MAC-IP server; New AP detects mobile terminal according to 802.11 association response frame, sends to the message of MAC-IP server only to comprise the MAC Address of mobile terminal and up-to-date gateway address, and gateway address is the IP address of new node AdHoc pattern network interface card;
Step 4:MAC-IP server is after receiving roaming message, and the IP address of searching mobile terminal according to MAC Address, upgrades the gateway ip address of this mobile terminal in MAC-IP table when MAC-IP message is informed to new AP;
Step 5: new AP receives after the response message of MAC-IP server, first according to the IP address architecture of mobile terminal, go out its default gateway address, as transmitting terminal IP in ARP, the ARP message of send forging is to mobile terminal, by the upstream voice data new AP self that leads; With stylish AP, other node updates routes in broadcast and unicast messages informing network will be sent respectively, a hop neighbor node for new AP, they can receive the broadcast of new AP, for two hop neighbor nodes and above node, they upgrade route according to the unicast messages of new access point; MAC-IP server upgrades immediately route after receiving roaming message;
Step 6: other nodes in network are after receiving road report message, re-establish one about the route table items of this mobile terminal, when receiving that while mailing to the downlink voice data of this mobile terminal from sip server, other nodes forward according to this route table items; Because the IP address of mobile terminal and the IP of its new AP be not in same subnet, new AP is also by route table items of interpolation, thereby finally gives mobile terminal by the downlink voice data of receiving.
2. according to claim 1 based on the auxiliary VoWLAN loaming method of AP, it is characterized in that: when mobile terminal again roaming switch occurs, except above-mentioned steps, the previous associated nodes of mobile terminal also needs to delete the route table items about this mobile terminal, delete the process of route table items by MAC-IP server triggers, by sending a piece of news to origin node, realize.
3. according to claim 1 based on the auxiliary VoWLAN loaming method of AP, it is characterized in that: the process of establishing of the MAC-IP information described in step 1 is: after mobile terminal is associated with AP, by DHCP, obtain IP address, and send Gratuitous ARP, AP monitors the MAC-IP information that Gratuitous ARP obtains mobile terminal, on the node being directly connected with sip server, store this information, this node is as MAC-IP server, other nodes detect this node of MAC-IP information notification that Gratuitous ARP obtains, MAC-IP server record has the MAC-IP information of all mobile terminals in whole network.
4. according to claim 1 based on the auxiliary VoWLAN loaming method of AP, it is characterized in that: the new AP described in step 2 is maximum one of Probe frame inverse signal intensity, and mobile terminal selects the process of new AP associated not intervene.
5. according to claim 1 based on the auxiliary VoWLAN loaming method of AP, it is characterized in that: the notice flow process of the roaming message described in step 3 is: whether new AP detects mobile terminal according to 802.11 Association Response frames associated, new AP detect associated with the mobile terminal of roaming after, MAC-IP server in network sends roaming message, inform that roaming switch has occurred this mobile terminal of MAC-IP server, send to the message of MAC-IP server only to comprise the MAC Address of roaming mobile terminal and up-to-date gateway address, gateway address is the IP address of new node AdHoc pattern network interface card.
6. according to claim 1 based on the auxiliary VoWLAN loaming method of AP, it is characterized in that: the new AP described in step 5 receives after the response message of MAC-IP server, first according to the IP address architecture of mobile terminal, go out its default gateway address, its default gateway address is the IP address that in same subnet, last byte is 1.
7. according to claim 1 based on the auxiliary VoWLAN loaming method of AP, it is characterized in that: the discriminating conduct of the hop neighbor node described in step 5 and multi-hop neighbor node is in a Mesh network, the route table items that node produces according to olsrd is judged its and is jumped and multi-hop neighbor node, the gateway of all hop nodes is the IP address of full 0, without other nodes, forwards.
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| CN113596939A (en) * | 2021-06-30 | 2021-11-02 | 青岛海尔科技有限公司 | Network connection method and device of mobile terminal, storage medium and electronic device |
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