CN103024720B - Network mobility management method of internet protocol version 6 over low power wireless personal area network (6LoWPAN) - Google Patents

Network mobility management method of internet protocol version 6 over low power wireless personal area network (6LoWPAN) Download PDF

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CN103024720B
CN103024720B CN201210546094.3A CN201210546094A CN103024720B CN 103024720 B CN103024720 B CN 103024720B CN 201210546094 A CN201210546094 A CN 201210546094A CN 103024720 B CN103024720 B CN 103024720B
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mobile
address
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CN103024720A (en
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由磊
李素梅
韩雨佟
雷建军
侯春萍
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Tianjin University
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Tianjin University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention relates to the network technology. In order to support moving of a mobile subnet of a small scale or a medium scale, the technical scheme includes that a network mobility management method of an internet protocol version 6 over low power wireless personal area network (6LoWPAN) includes the following steps that: (1) an entity (an agent mobile router) is disposed on a router position on the network edge of the 6LoWPAN; (2) a mobile access anchor point entity is added in a communication frame; (3) a mobile network moves to a new 6LoWPAN domain and then registers an obtained new care-of address, a home address and a network prefix with a private mobile radio (PMR); (4) the PMR sends an own care-of address and associated information of the network prefix of the mobile network to a domain name server (DNS) of a home domain where the mobile network is located, and sends the associated information to a home agent of the mobile network; and (5) a mobile network node and an objective communication node transmit data through transshipment of the PMR of a foreign domain where the mobile network is located, and achieve mutual two way communications. The network mobility management method of the 6LoWPAN is mainly used for network communications.

Description

The network mobility management method of 6LoWPAN
Technical field
The present invention relates to the network technology for 6LoWPAN, specifically, relate to the network mobility administrative skill of 6LoWPAN.
Background technology
Being integrated with network technology, embedded technology and the low-data-rate wireless personal area network (LR-WPAN) of sensor technology is network for short distance, low rate, low-consumption wireless communicate and design, can be widely used in the field such as intelligent appliance and Industry Control.IETF is organized in and has formally set up IPv6over LR-WPAN(abbreviation 6LoWPAN in November, 2004) working group, set about formulating the Low rate wireless personal area network standard based on IPv6, i.e. IPv6over IEEE 802.15.4, being intended to IPv6 to introduce with the Wireless Personal Network of IEEE 802.15.4 for bottom standard, there is having promoted the development of wireless personal domain network of short distance, low complex degree, low rate, low-power consumption in it.IEEE 802.15.4 is the safety network implementations of the wireless standard that 2004 propose, the agreement of main definitions physical layer and MAC layer, the main reference of all the other agreements and the existing standard of employing.
The physical layer that 6LoWPAN technology bottom adopts IEEE 802.15.4 to specify and MAC layer, network layer adopts IPv6 agreement.It is exactly huge address space that IPv6 is applied to the maximum bright spot of LR-WPAN, and this exactly meets disposes needs that are extensive, the high density LR-WPAN network equipment.IPv6 supports shaftless driving, and has compared with state configures automatically, and the required expense of configuration is less, and this is just applicable to LR-WPAN equipment characteristic.Meanwhile, the place that be distributed in personnel be thick and fast difficult to arrive because LR-WPAN equipment possibility is a large amount of, realizes shaftless driving and then seems more important.Due in IPv6, the loaded length that the loaded length that MAC supports can provide much larger than 6LoWPAN bottom, in order to realize the seamless link of MAC layer and network layer, the suggestion of 6LoWPAN working group increases a network adaptation layer between network layer and MAC layer, be used for header-compressed, burst and the work such as restructuring and netted routing forwarding, enable sensor network be connected to IPv6Internet smoothly.6LoWPAN just take into account wireless sensor network and the various network interconnection sex chromosome mosaicism based on IP technology as the wireless sensor network representative based on IP technology when designing.6LoWPAN is that each sensor node defines a kind of Tiny TCP/IPv6 protocol stack, this makes individual node as PC, to apply IP technology communicate, realize wireless sensor network and IP network is seamless interconnected, also ensure that the end-to-end communication between internet interior joint, this is very important for wireless sensor network based on the remote data acquisition of Internet and the control of node simultaneously.
Because 6LoWPAN network is all exist with the form of fairly large wireless multi-hop network usually, multiple Mobile IP subnet is there is in network, each subnet has an edge wireless router to carry out network identity, network topology is dynamic change constantly, and the routing infrastructure consisted of these routers between each subnet carries out communications.When network mobility techniques makes mobile network move between different Access Networks, same IPv6 address can be continued to use, keep unbroken network to connect and application service simultaneously.The ambulant mobile network of network enabled refers to, be made up of one or more Mobile IP subnet, and can be considered the network of an integral unit movement, the optional position of the Internet can be moved to, all unit of this network internal can pass through one or more mobile router (MR, Mobile Router) and manage and be responsible for the connection with external the Internet.The NEMO(NetworkMobility of IETF) working group's basic supported protocol of authorized exploitation NEMO.Similar with Mobile IP mechanism, NEMO network has a router as home agent (HA, Home Agent) on home link.NEMO network obtains permanent IP address prefix from home network, and externally declares route by HA, and MR has home address (HoA) in local network allocation.
The application model of the basic supported protocol of NEMO as shown in Figure 1.The basic supported protocol of NEMO realizes the movement of NEMO network, NEMO internal nodes of network and other node communication routine as follows:
(1) when NEMO network leaves local, its MR access link.Access link configures a Care-of Address (CoA), and then MR sends a binding update messages to HA.Binding update messages arranges mark R, and can comprise the Option Header of NEMO network prefix information.
(2) when HA receives binding update messages, set up the home address HoA of MR and the binding record of Care-of Address CoA in the buffer, the prefix for NEMO network is set up and is transmitted.
(3) HA is to the response message of MR transmission to Binding Update.Once above-mentioned binding procedure completes, just between HA and MR, establish a bidirectional tunnel.The end points in tunnel is HA and CoA.
(4) if receive from NEMO mobile network the packet that source address belongs to NEMO network prefix scope, MR is transmitted to HA from the rightabout in this tunnel after packet is carried out IP-In-IP encapsulation.The packet that HA deblocking receives also forwards to destination communication node (CN, Corresponding Node).
(5) when CN sends packet to NEMO network node, first packet can forward to HA.After HA receives packet, be sent to the MR of NEMO network by bidirectional tunnel, then be honored as a queen by MR solution and be forwarded to corresponding destination node.
NEMO network is not optimized front Problems existing:
When CN and mobile network node (MNN, Mobile Network Node) communicate, the packet sent all must carry out route by its home agent, namely forms Triangle routing communication pattern, and this path is more than conventional singlecast router length.NEMO network internal generally comprises node that is multiple and external interconnections Network Communication.Compared with single mobile host, need more link bandwidth and device forwards ability by HA-MR tunnel forwarding data.HA-MR tunnel reduces the efficiency of network, and the transfer of home network participation mobile network data also easily becomes the bottleneck of network.Therefore carry out Triangle routing by HA and cause the congested of larger data transfer delay, larger power consumption, higher data-bag lost and home network.
Due to the mobility of NEMO network, multiple mobile network adheres to successively, can form the nested NEMO network of tree-shaped.Like this, mobile network is nested layer by layer, if using each mobile network as a node, with its MR representatively, and avoid occurring that ring-type is nested, whole nested mobile network just forms a kind of tree topology.For accompanying drawing 2(a) shown in nested NEMO, NEMO2 and NEMO3 is accessed NEMO1 respectively, and accesses Internet by NEMO1.When the local stationary nodes (LFN3) under NEMO3 communicates with the stationary nodes (LFN2) under NEMO2, according to the flow process of the basic supported protocol of mobile network, packet must forward along the path of LFN3 → MR3 → MR1 → HA1 → HA3 → HA2 → HA1 → MR1 → MR2 → LFN2, this forward-path to be connected with two sections of bidirectional tunnels of HA2 to MR2 by MR3 to HA3 and to form, the bidirectional tunnel of MR1 to HA1 is nested in again on two sections of bidirectional tunnels, as accompanying drawing 2(b respectively simultaneously) shown in.As can be seen here, when NEMO network occurs nested, will there is serious polygonal route in the communication between internal node, and the number of plies that tunnel is nested is simultaneously directly proportional to the degree of depth that nested NEMO sets.Due to form nested NEMO each mobile router between can not route mutually, and the transmission of packet must be realized by HA and tunnel, therefore, along with the increase of nested progression, the utilance of the propagation delay time of packet, packet loss and transmission bandwidth all can raise pro rata or reduce.
Current prioritization scheme is mainly for polygonal routing issue, and common a kind of prioritization scheme is as described below.
Utilize the information entrained by Binding Update message to construct the routing iinformation of MR in nested domain, realize the autonomous routing function of the inner MR of nested mobile network.Safeguard that one forms the routing table of routing iinformation by home address and Care-of Address separately at all MR of nested networks inside.Identify next hop address with Care-of Address in the routing table, come recognition purpose address with home address simultaneously.Whenever have new MR need the MR of nested access to mobile network or nested mobile network inside be moved switch time, this MR all can to its home address send Binding Update.In this binding update messages, carry mobile network's prefix option and home address destination option, in option, have recorded the home address prefix information of MR and the home address of MR respectively.Meanwhile, in the IP head of binding update messages, source address field is the Care-of Address of MR, and destination address is the hometown-agent-address of MR.A route table items can be increased in routing table at self when the father node of this MR is subject to binding update messages, this route entry next hop address is the source address parsed from binding update messages, the i.e. Care-of Address of child node, destination address is the home address prefix in binding update messages entrained by mobile network's prefix option.Father node also can replace the source address field in binding update messages with the Care-of Address of self simultaneously.MR again to upper level after completing process forwards.A circular recursion is until the root of whole nested mobile network tree.
The program can realize the optimize communicate of nested mobile network inside and avoid and that cause bandwidth waste nested due to tunnel, and effectively solves polygonal routing issue.But the program every one-level MR in the process of carrying out Binding Update both increases processing delay, increase power consumption, certain influence can be caused to the performance of handoffs of MR equally at this level.When the nested number of plies increases, the problem caused is more serious.
There are the following problems for the existing scheme of current solution 6LoWPAN lattice nesting:
(1) data-message has to pass through at least one home agent and corresponding tunnel could arrive destination node; triangle and polygonal routing to communicate pattern make data-message the routed path of process be not optimal path; still need to be optimized route to reduce routing cost, shorten route time; (2) set up route by means of extra command messages, add the expense setting up route, increase network power consumption; (3) need to increase the extra network equipment or software support, add the cost of Network Mobility.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art, propose a kind of stable network mobility techniques fast and solve the communication issue brought in Network Mobility process, support the movement of the motion subnet of little, middle scale, for achieving the above object, the technical scheme that the present invention takes is, the network mobility management method of 6LoWPAN, comprises the steps:
(1) entity is set up in 6LoWPAN network edge router position--Agent Mobile Router (PMR, ProxyMobile Router), this entity has oneself routing table a set of, has the network prefix of all-ones subnet network in this 6LoWPAN network domains, Care-of Address and home address information in routing table;
(2) in communication construction, add mobile access anchor point (MAP, Mobile Anchor Point) entity, when it is responsible for being moved network switching in this region, complete the mapping that network communication node switches the Care-of Address of front and back;
(3), after movement of mobile network to new 6LoWPAN network domains, new Care-of Address, home address and the network prefix that obtain are registered to PMR;
(4) related information of the Care-of Address of oneself and the network prefix of mobile network is sent to the DNS in territory, local, mobile network place by PMR, and sends this related information to the home agent (HA, HomeAgent) of mobile network;
(5) mobile network node (MNN, MobileNetworkNode) and object communication node (CN, CorrespondingNode) are by the PMR transfer transmission data of region outside mobile network place, can realize two-way communication each other.
Step (1) is specially: Agent Mobile Router PMR, comprises the route binding record of binding update messages that mobile router (MR) sends and nested NEMO network internal; Each PMR has oneself route information table a set of, has three contents in table, and one is the Care-of Address territory of network internal mobile router (MR), and one is the home address territory of MR, and one is the network prefix of the mobile network of MR; Add when there being new subnet or single mobile network applies for time, first PMR searches oneself routing table information, if without this network information, then newly in table adds a route table items; If there is this network information, then upgrade its route table items content.
Step (2) is specially: when mobile access anchor entity is responsible for being moved network switching in this region, complete the mapping that network communication node switches the Care-of Address of front and back, physical location, when the subnet at mobile node place changes the access point be connected with Internet, mobile network is first by route request information and route notification, obtain new Care-of Address (NCoA), then mobile network initiates registration to on-site MAP, is bound by the Care-of Address (ICoA) before switching in the binding buffer of MAP with NCoA.
Step (3) is specially: mobile router (MR) the i.e. edge router of this network of mobile network, serve as the gateway of mobile network, when network is moved another network of access, MR represents mobile node outside region application Care-of Address (CoA) in mobile network and completes local registration process, MR first obtains a CoA by the operation of the basic supported protocol of mobile network, then the new Care-of Address that the mobile network node of this mobile network has obtained is notified, and send route requests registration message to the PMR in present networks territory, the home address of MR is comprised in message, current Care-of Address and the network prefix of mobile network, this locality registration is carried out in request, after PMR receives the route requests registration message of MR, first check whether the address translation table of the MR sending registration message is present in the route information table of PMR, if exist, then upgrade in list item and obtain Care-of Address territory, if do not exist, then in PMR route information table, increase a new list item, the home address territory of list item is the home address of MR, and network prefix territory is the network prefix of the mobile network of MR, and Care-of Address territory is the Care-of Address of MR.PMR sends route advertisement message to MR.After PMR receives the acknowledge message that MR returns, the care-of address registration process of mobile router terminates.
Step (5) is specially:
1., when communication node (CN) sends packet to LoWPAN mobile node (MNN), CN, by the DNS in the territory, local of inquiry mobile network, obtains the incidence relation information of MNN mobile network's prefix and PMR Care-of Address; Then data message is mail to PMR; Another kind of situation, if CN is by inquiry DNS, acquisition be the home address of MNN; Packet is mail to the territory, local of MNN by CN, the HA of MNN intercepts and captures this data message, by the related information of the PMR in query caching and network prefix, this packet is mail to PMR, after PMR receives data message, by data message forwarding to object mobile router, be then forwarded to object mobile node;
2. when the MNN in mobile network externally initiates to connect, first response data packet arrives mobile router, then the PMR of place network domains is mail to by MR, after PMR receives data message, whether the destination address first searching packet according to routing table information belongs to the mobile network at PMR place, if do not find the address of coupling in the routing table, so packet is sent to object communication node by IPv6 mode; If find match address in the routing table, so route a data packet to object mobile router, complete the transmission of packet.
Technical characterstic of the present invention and effect:
The mobile network route optimizing scheme that the present invention proposes, Agent Mobile Router entity is set up by the outer region network at mobile network place, when mobile network node is communicated with communication node, substantially through home agent and tunnel encapsulation etc. need not be set up, solve Triangle routing problem, reduce data packetloss phenomenon, save data transfer overhead, shorten data transmission delay.And add mobile access anchor entity in the network architecture, when mobile network switches, decrease the communication interrupts time, ensure that good Consumer's Experience.Therefore, this 6LoWPAN mobile network route optimizing technology is applied in mobile radio network, greatly can improves the transport communication efficiency of wireless network, greatly the application of extended wireless mobile communications network.
Accompanying drawing explanation
The basic supported protocol model of Fig. 1 NEMO.
The nested NEMO network of Fig. 2 (a), (b) route tunnel is nested.
Fig. 3 this programme Internet Transmission model and data packet transmission flow process.
Fig. 4 this programme NEMO network transmission signal data flow.
Embodiment
The progressively ripe and application of network on the moving persons such as 6LoWPAN network and aircraft, steamer, automobile and train in moving, with one, relatively stable and reliable form is connected to the Internet to network during people wish these to move, require that mobile Internet not only supports the movement of single terminal, and support the movement of motion subnet of little, middle scale.At present, about the research of 6LoWPAN Network Mobility problem, the scheme that at home and abroad there is no complete set solves.Therefore, be badly in need of proposing a kind of stable network mobility techniques fast and solve the communication issue brought in Network Mobility process.
The design proposes a kind of network mobility management method based on 6LoWPAN, mainly contains following characteristics:
1. set up an entity in 6LoWPAN network edge router position--Agent Mobile Router (PMR, Proxy MobileRouter), this entity has oneself routing table a set of, has the network prefix of all-ones subnet network in this 6LoWPAN network domains, Care-of Address and home address information in routing table.
2. in communication construction, add mobile access anchor point (MAP, Mobile Anchor Point) entity, when it is responsible for being moved network switching in this region, complete the mapping that network communication node switches the Care-of Address of front and back.
3., after movement of mobile network to new 6LoWPAN network domains, new Care-of Address, home address and the network prefix that obtain are registered to PMR.
The related information of the Care-of Address of oneself and the network prefix of mobile network is sent to the DNS in territory, local, mobile network place by 4.PMR, and sends this related information to the HA of mobile network.
5. mobile network node (MNN, MobileNetworkNode) and object communication node (CN, Corresponding Node) are by the PMR transfer transmission data of region outside mobile network place, can realize two-way communication each other.
The method used in the design, focus on and avoid transmission data by home network transfer, the complexity of whole system is lower, and transmitting procedure is comparatively simple.The network mobility administrative model of the 6LoWPAN that the design proposes as shown in Figure 3.
The invention provides a kind of mobile network node also need not need not set up the Network Mobility that tunnel can communicate with communication node routing optimality scheme through home agent.This communication pattern avoids data-message and carries out home network transfer, optimizes the routed path of communication, reduces network power consumption.The program can solve polygonal route in mobile network and communication delay problem effectively.
The scheme that the present invention proposes mainly comprises the optimization of the inner routing optimality of nested networks and mobile network node and communication node communication process.
One, novel entities Agent Mobile Router and route information table thereof
An Agent Mobile Router (PMR is set up at the edge route location of the nonlocal 6LoWPAN network domains at mobile network place, Proxy Mobile Router), PMR comprises the route binding record of binding update messages that mobile router (MR, Mobile Router) sends and nested NEMO network internal.Each PMR has oneself route information table a set of, has three contents in table, and one is the Care-of Address territory of network internal mobile router (MR), and one is the home address territory of MR, and one is the network prefix of the mobile network of MR.Add when there being new subnet or single mobile network applies for time, first PMR searches oneself routing table information, if without this network information, then newly in table adds a route table items; If there is this network information, then upgrade its route table items content.
Two, first movement of mobile network, in a new network domains, obtains new Care-of Address, the local registration of application.
The MR i.e. edge router of this network of mobile network, serves as the gateway of mobile network.When network is moved another network of access, MR represents mobile node outside region application Care-of Address (CoA) in mobile network and completes local registration process.MR first obtains a CoA by the operation of the basic supported protocol of mobile network, then the new Care-of Address that the mobile network node of this mobile network has obtained is notified, and send route requests registration message to the PMR in present networks territory, comprise the network prefix of the home address of MR, current Care-of Address and mobile network in message, request is carried out this locality and is registered.
Three, the local registration process of MR Care-of Address
After PMR receives the route requests registration message of MR, first check whether the address translation table of the MR sending registration message is present in the route information table of PMR, if exist, then upgrade in list item and obtain Care-of Address territory; If do not exist, then in PMR route information table, increase a new list item, the home address territory of list item is the home address of MR, and network prefix territory is the network prefix of the mobile network of MR, and Care-of Address territory is the Care-of Address of MR.PMR sends route advertisement message to MR.After PMR receives the acknowledge message that MR returns, the care-of address registration process of mobile router terminates.Four, in framework, mobile access anchor point (MAP, Mobile Anchor Point) entity is added
When it is responsible for being moved network switching in this region, complete the mapping that network communication node switches the Care-of Address of front and back, physical location as shown in Figure 3.When the subnet at mobile node place changes the access point be connected with Internet, mobile network is first by route request information and route notification, obtain new Care-of Address (NCoA), then mobile network initiates registration to on-site MAP, is bound by the Care-of Address (ICoA) before switching in the binding buffer of MAP with NCoA.Like this when binding information is not also sent to the DNS in territory, local of mobile network by PMR, communication node just can be issued the NCoA address of packet fast-forwarding to mobile network of the ICoA address of mobile network by MAP, ensure that, in quick handoff environment, the communication of node is not interrupted.
Five, message binding is carried out with the DNS of home network domain
After the mobile router care-of address registration of the network be moved terminates, namely after PMR receives the route advertisement message that MR returns, the related information of the Care-of Address of oneself and the network prefix of mobile network is sent to the DNS in the territory, local of mobile network by PMR, and PMR sends binding update messages to the home agent HA of MR simultaneously.In the cache list that HA builds, set up associating of the network prefix of PMR and mobile network within it, when HA intercept and capture mail to the packet of MNN time, be forwarded to the Care-of Address of PMR by the bidirectional tunnel between PMR.
Six, data transmission procedure
1. as communication node (CN, Corresponding Node) send packet to LoWPAN mobile node (MNN, MobileNetworkNode), time, CN, by the DNS in the territory, local of inquiry mobile network, obtains the incidence relation information of MNN mobile network's prefix and PMR Care-of Address; Then data message is mail to PMR; Another kind of situation, if CN is by inquiry DNS, acquisition be the home address of MNN; Packet is mail to the territory, local of MNN by CN, and the HA of MNN intercepts and captures this data message, by the related information of the PMR in query caching and network prefix, this packet is mail to PMR.After PMR receives data message, by data message forwarding to object mobile router, be then forwarded to object mobile node.
2. when the MNN in mobile network externally initiates to connect, first response data packet arrives mobile router, then mail to the PMR of place network domains by MR, after PMR receives data message, whether the destination address first searching packet according to routing table information belongs to the mobile network at PMR place.If be the address finding coupling in the routing table, so packet is sent to object communication node by IPv6 mode.If find match address in the routing table, so route a data packet to object mobile router, complete the transmission of packet.
The present invention is further described below in conjunction with the drawings and specific embodiments.
Present design frame diagram as shown in Figure 3.Signal data transport stream as shown in Figure 4.The method of specific implementation comprises the following steps:
One, mobile router (MR, Mobile Router) MR1 obtains Care-of Address, carries out this locality registration.
Mobile network identifies with the mobile router of present networks, when MR1 is from LoWPAN1 Network Mobility to LoWPAN2 network, MR1 is by sending routing broadcast, a Care-of Address CoA is obtained according to the basic supported protocol of NEMO, notify the Care-of Address that mobile network's internal node is new, then MR1 according to the path of MR1 → MR2 ˊ → PMR2 to Agent Mobile Router (PMR, Proxy Mobile Router) PMR2 sends local registration message, and message comprises the home address of MR1, network prefix and new Care-of Address.PMR2 inquires about the routing table information of oneself, if exist, then by the content update of MR1 in routing table; If do not exist, then newly add a list item, by MR1 information stored in routing table.PMR2 returns a route advertisement message to MR1, when PMR2 receives the return messages of MR1 again, then shows that registration process terminates.
Two, MR1 registers to mobile access anchor point (MAP, Mobile Anchor Point).
After MR1 obtains new Care-of Address, register new Care-of Address to location MAP, the new Care-of Address of MR1 and the Care-of Address before switching are bound by MAP in its binding buffer.
Three, Binding Update information
After MR1 registration process terminates, the Care-of Address (CoA_PMR2) of oneself and the related information of the home network prefix (MR1_prefix) of MR1 are sent to the local DNS of MR1 by PMR2, and send this related information to the home agent MR1_HA of MR1, in the list buffer that MR1_HA builds, set up the related information of CoA_PMR2 and MR1_prefix within it.
Four, data transmission procedure
1. flow into data message process
(1) as communication node (CN, Corresponding Node) send packet to the mobile node (MNN in mobile network MR1, Mobile Network Node) time, CN, by the DNS in the territory, local of inquiry mobile network, obtains the incidence relation information of MNN mobile network's prefix (MNN_prefix) and PMR2 Care-of Address (CoA_PMR2); Then CN adopts the 2nd class route head option, and address for the purpose of the Care-of Address of PMR2, the home address of MNN is placed in the 2nd class route head option, sends this data message.
Another kind of situation, if CN is by inquiry DNS, acquisition be the home address of MNN; CN is address for the purpose of the home address of MNN, packet is mail to the territory, local of MNN, and the home agent MR1_HA of MNN intercepts and captures this data message, by the related information of the PMR in query caching and network prefix, this packet is mail to PMR2.
(2) after this data message is received by PMR2, PMR2, according to the destination address of packet, checks route list information, finds the binding record of MNN home address and MNN Care-of Address and nested NEMO internal routing paths.Source data packet address is changed to the Care-of Address of PMR2, destination address changes the Care-of Address of MNN into, and the home address of MNN is placed in the 2nd class route head option.Then packet is forwarded to object mobile router MR1.
(3), after object MR1 receives packet, from the 2nd class route head option, extract the home address of MNN, data message is sent to object MNN.Its concrete data packet transmission flow process is as shown in A0 → A1 → A2 or B1 → B2 → B3 in accompanying drawing 3.
2. flow out data message process
(1) when the MNN in mobile network externally initiates to connect, the source address of data message is the IPv6 address of mobile network node oneself, and destination address is the home address of MR1, and the IPv6 address bag of communication node is placed in the 2nd class route head option.
(2) first response data packet arrives mobile router, and MR1 extracts the IPv6 address of communication node from the 2nd class route head option.The source address of data message is updated to its Care-of Address by MR1, and destination address is updated to the IPv6 address of communication node.MNN home address leaves in the route head option of type 2.
(3), after PMR2 receives data message, whether the destination address first searching packet according to routing table information belongs to the mobile network at PMR2 place.If be the address finding coupling in the routing table, so packet is sent to object communication node by IPv6 mode.Concrete data packet transmission flow process is as shown in C1 → C2 in accompanying drawing 3.If find match address in the routing table, so route a data packet to object mobile router, complete the transmission of packet.Its concrete data packet transmission flow process is as C1 → C2 ˊ in accompanying drawing 3.

Claims (4)

1. a network mobility management method of 6LoWPAN, is characterized in that, comprises the steps:
(1) entity is set up in 6LoWPAN network edge router position--Agent Mobile Router (PMR, ProxyMobile Router), this entity has oneself routing table a set of, has the network prefix of all-ones subnet network in this 6LoWPAN network domains, Care-of Address and home address information in routing table;
(2) in communication construction, mobile access anchor point (MAP is added, Mobile Anchor Point) entity, when it is responsible for being moved network switching in this 6LoWPAN network domains, complete the mapping that network communication node switches the Care-of Address of front and back;
(3), after movement of mobile network to new 6LoWPAN network domains, new Care-of Address, home address and the network prefix that obtain are registered to PMR;
(4) related information of the Care-of Address of oneself and the network prefix of mobile network is sent to the DNS in territory, local, mobile network place by PMR, and sends this related information to the home agent (HA, Home Agent) of mobile network;
(5) mobile network node (MNN, Mobile Network Node) and object communication node (CN, CorrespondingNode) by the PMR transfer transmission data of region outside mobile network place, two-way communication each other can be realized.
2. the network mobility management method of 6LoWPAN as claimed in claim 1, it is characterized in that, step (1) is specially: Agent Mobile Router PMR, comprises the route binding record of binding update messages that mobile router (MR) sends and nested NEMO network internal; Each PMR has oneself route information table a set of, has three contents in table, and one is the Care-of Address territory of network internal mobile router (MR), and one is the home address territory of MR, and one is the network prefix of the mobile network of MR; Add when there being new subnet or single mobile network applies for time, first PMR searches oneself routing table information, if without this network information, then newly in table adds a route table items; If there is this network information, then upgrade its route table items content.
3. the network mobility management method of 6LoWPAN as claimed in claim 1, it is characterized in that, step (3) is specially: mobile router (MR) the i.e. edge router of this network of mobile network, serve as the gateway of mobile network, when network is moved another network of access, MR represents mobile node outside region application Care-of Address (CoA) in mobile network and completes local registration process, MR first obtains a CoA by the operation of the basic supported protocol of mobile network, then the new Care-of Address that the mobile network node of this mobile network has obtained is notified, and send route requests registration message to the PMR in present networks territory, the home address of MR is comprised in message, current Care-of Address and the network prefix of mobile network, this locality registration is carried out in request, after PMR receives the route requests registration message of MR, first check whether the address translation table of the MR sending registration message is present in the route information table of PMR, if exist, then upgrade the Care-of Address territory in list item, if do not exist, then in PMR route information table, increase a new list item, the home address territory of list item is the home address of MR, and network prefix territory is the network prefix of the mobile network of MR, and Care-of Address territory is the Care-of Address of MR, PMR sends route advertisement message to MR, after PMR receives the acknowledge message that MR returns, the care-of address registration process of mobile router terminates.
4. the network mobility management method of 6LoWPAN as claimed in claim 1, is characterized in that:
(1) when communication node (CN) sends packet to LoWPAN mobile node (MNN), CN is by the DNS in the territory, local of inquiry mobile network, obtain the incidence relation information of MNN mobile network's prefix and PMR Care-of Address, then data message is mail to PMR; Another kind of situation, if CN is by inquiry DNS, what obtain is the home address of MNN, packet is mail to the territory, local of MNN by CN, and the HA of MNN intercepts and captures this data message, by the related information of the PMR in query caching and network prefix, this packet is mail to PMR, after PMR receives data message, by data message forwarding to object mobile router, be then forwarded to object mobile node;
(2) when the MNN in mobile network externally initiates to connect, first response data packet arrives mobile router, then the PMR of place network domains is mail to by MR, after PMR receives data message, whether the destination address first searching packet according to routing table information belongs to the mobile network at PMR place, if do not find the address of coupling in the routing table, so packet is sent to object communication node by IPv6 mode; If find match address in the routing table, so route a data packet to object mobile router, complete the transmission of packet.
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