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Mobile Inter-networking Ipv6 Concepts by Rajeev Koodli, First Edition
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This ebook Mobile Internetworking with IPv6: Concepts, Principles has that corporations are long or no liquidation with corporation to the tax, protection, and capital of a 26 outrages. This group includes transport and application layer solutions that are typically employed in heterogeneous networks to allow specific applications to function over different network technologies with different features. By locating mobility mechanisms high in ISO—OSI protocol stack we are able to provide mobility support largely independent of underlying network features for example, there is no need for additional mechanisms at network devices , but the support we obtain is limited to specific transport protocols, applications or even particular implementations of a given user application.
A transport layer performance is strongly influenced by the mobility of network elements.
Principle 1: Understand the user need
In order to enable transport layer mobility, it is necessary to remove network-layer dependences by using indirection, migration, tunneling or multi-homing techniques. In both cases, Dynamic DNS concept is used to track the mobile nodes and update their current location.
In the application layer there are several attempts to support Internet mobility. The SIP is an application-layer protocol used to maintain multimedia sessions [ 39 ]. SIP allows two or more participants to manage a session consisting of different media stream types. For example, video and voice streams can be directed to the appliances specialized to receive particular workload.
This protocol stack is not able to meet all the needs of the Future Internet. As shown in many analyses also here , its use does not satisfactorily solve many of the problems standing on the way of providing effective service to different user groups existing in the current and still evolving Internet. Therefore many efforts are undertaken to design new network mechanisms there are not simple modifications of existing protocols, but are designed, from the very beginning, taking into account the requirements of mobile users.
The prevailing trends take into account differentiated solutions based on a variety of virtualization techniques. The very characteristic element of many of such proposals is the introduction of mechanisms that allow the separation of the so-called upper layers from the transport network e. The transport network may be, in practice, any communication system that enables data transmission between two devices—employed solutions include both the data link such as Ethernet and network layer eg, IPv4, IPv6 technologies.
Thanks to virtualization, the techniques used in the transport network, as well as its structure and configuration do not have a direct impact on the logical structure of the system as perceived by higher layers. Additionally, all aspects of the transport network operation can be changed in a way practically invisible to them. This makes, from higher layers point of view, a highly flexible environment to implement their functionality. Another advantage is the possibility to use any, abstract identifier of the target object, which is not determined by its location in the physical structure of the network.
This is a huge advantage for handling mobile devices, as the identifier in a natural way may remain unchanged. This allows a relatively easy implementation of systems of content aware network elements content aware networks—CANs. Host identity protocol HIP [ 11 ] introduces an additional layer between the transport and network layers and assigns to the node a cryptographically generated public key.
The proposed approach introduces a distinction between an identifier the public key and a node locator IP address. In practice, instead of using the public key for addressing, the nodes use its hash values, called Host Identity Tags HITs. The binding matching between the identifier and locator is stored in dedicated network infrastructure components called Rendezvous Servers RVSs. Each node is assigned to one of RVSs that monitors its current location. Next, the CN directs the first packet of intended transmission to this specified RVS server, which retransmits it to the destination MH.
As a result of this transfer, the correspondent node and mobile station can communicate directly as exchanged datagrams contain actual IP addresses of both corresponding parties. This concept allows for the elimination of one of the most serious limitations of IP addressing, namely separates the node connection identifier ID from its current location in the structure of an IP network. In the case of classical IP network layer mechanisms, the nodes had to always obtain an IP address from the pool available at a given location, determined by the routing structure.
In practice, any change in the location of the node, resulting in a change of its network access point, resulted in turn in the need to obtain a new IP address, and changing its identity. In addition, in its basic version, the solution does not require any modification of the network stack of end-nodes, since all mechanisms are located on access routers. ETR unpacks the package and delivers it to the destination node. As a result, we have a scalable solution enabling for movement of nodes from one location to another one transparent for the upper layers, without changing their address information; this in turn offers a wide range of applications, such as improved flexibility in the use of available address pools, easier change of the location of service infrastructure elements, faster response on failures, etc.
In addition, it should be noted that this solution is also a convenient tool for migration, as the network layer responsible for transferring the data can be changed without necessity to change the mechanisms of the upper layers. Note, however, that the LISP solution is not directly mentioned as a method to support the mobility of nodes, because the area of its operation would be limited to network access routers equipped with powerful mechanisms required by this solution. This approach enables the macromobility, but on the other hand, requires implementation of the LISP-Mobility components in a MN it is not required for the CN , and also causes much larger number of mappings maintained by a Map-Server device.
The LISP architecture is also flexible and easily extensible, which could provide a platform for a greater number of additional network services. We should also note, that another solution based on similar principles, Indentifier—Locator Network Protocol, has been proposed in [ 43 ]. It accepts an abstract network protocol, based on IPv6 and splitting the IP address into separate Identifier representing a virtual or physical node and Locator being an IPv6 address prefix and describing a single IP sub-net. Usage of these two separate names can provide an elegant integrated solution to the key issues referring to routing and mulihoming, without changing the core routing architecture, while offering incremental deployability through backwards compatibility with IPv6.
Handover scenario in mobilityfirst architecture NA —network address, PA —port address. This solution can be thought of as a layered approach. However, GUIDs are constructed in such a way that they fulfill a number of additional functions—being, for example, a public key of a given entity and being able to indicate a network region for example, an Autonomous System where more precise information about this entity can be found. GUIDs are then mapped to routable network addresses of data transport network, which are used to deliver data to its intended network destination.
To facilitate the process in large network, the precise information about the entity current location is available only in selected network areas indicated by a GUID for example, Autonomous Systems most probable for a node to be present in. It should also be noted that Content Aware Network mechanisms are proposed at this layer, which allow accessing resources available in multiple points of the network in an efficient manner by mapping GUID to the best of possible network addresses. Transport network addressing information for example IP address can then be added to the packet header 2.
Changing network address during handover between attachment points 3, 5 causes data delivery failure 4 at a network router, which then initiates a late binding procedure to dynamically resolve the destination GUID to a new network address 6 , while concurrently buffering the incoming data in order to prevent its loss.
Mobility protocols that operate in the data link layer are typically designed only for a particular underlying protocol, but can provide better performance over the generic solutions. The IEEE The network layer protocols are divided into addressing or mapping -based and host-based with host-based routing. The protocols from the first group incorporate different techniques to obtain mobility via IP address modification. The host-based protocols manage mobility by managing route table entry for a specific host in the traditional routing infrastructure.
Host-based protocols introduce smaller changes to the current network architecture at a cost of limited functionality. The addressing-based protocols can in turn be split into two main categories, utilizing tunneling or address translation. The protocols can be also categorized by the optimization they introduce. The protocols optimized for routing or topology strive to limit the complexity of the architecture. The handover optimized protocols are designed to limit the delays introduced when registration point changes.
A protocol may also be optimized for deployment in an existing network. Most of the well-developed, ready-to-deploy standards for mobility support in IP networks are network layer-based solutions. Included in this group are both client- and network-side mechanisms, such as MIP or PMIP, along with their multiple extensions and optimizations. They can be utilized by all protocols and applications residing above the network layer, which makes them fairly universal, as far as their usage is concerned. Depending on a particular deployment scenario, client- or network-side solution may be preferable.
Network-side solutions allow client device to remain unmodified, but require extensive and widespread modification of the network infrastructure. On the other hand, client-side approach requires mobility support to be included in end-user devices, without the need for extensive network-side support. Recent introduction of general-purpose operating systems into mobile devices and their resulting unification make such approach practical.
It should be noted, however, that strictly client-side solutions are rare, as most proposals require at least one element for example, a registration server, home agent etc. The network-side approach allows a network operator to efficiently provide mobility support to all of its users due to transparent support for all client devices , but only within its administrative domain.
Moreover the costs of modifying the network infrastructure can be high. A mobile device implementing client-side mobility support such as MIP, will retain it regardless of the network administrative domain in which it currently resides. Unfortunately, the client-side approach tends to be somewhat less efficient in terms of network resource utilization than network-side solutions. Due to the described difficulties in implementing and deploying network-layer IP mobility support, a number of higher-layer solutions have been proposed.
All of them require client-side modifications to function, as layers in which they operate can be absent within the communication network itself for example, a specific application-layer solution or transport-layer TCP mechanisms. Examples of such solutions include a limited number of ISO—OSI layer proposals, and a number of application-layer products. In general, higher-layer solutions promote ease of deployment while limiting the scope of the solution from transport-layer mechanisms able to provide mobility support for TCP connections between mobility-aware hosts , to applications specifically designed and implemented to function in a mobile environment, supported by a control protocol such as SIP.
It is worthy of note that except strictly network- or client-side proposals, all of the mentioned mobility support solutions, at some point require a service discovery mechanism to help them locate other elements of the employed mobility solution or obtain configuration parameters. It is a common practice to employ the Dynamic DNS service for this role, taking advantage of its high popularity and compatibility. In recent years, some new proposals have included an additional layer in the protocol stack specifically to deal with mobility.
This identifier is then mapped by mobility mechanisms to the appropriate network-layer address called locator address. Such an approach allows the identifiers to be assigned according to various needs, without limitations caused by network-layer mechanisms. Proposed applications of this ability include: security public keys as identifiers , content-aware networks routing to resources rather than network nodes , high-level service integration addressing services instead of elements of infrastructure , etc.
Most recent proposals, mainly related to various Future Internet initiatives, propose to include mobility support as an inherent element of a network protocol stack. From the above analysis, is seems evident that despite of extensive research and development activities concerning mobility protocols, there is still a need for an universal solution able to meet the demands of users and applications. A number of ideas that have been proposed so far all have some inevitable limitations as they are still based on the fixed-host assumption inherent in the original Internet.
Therefore, Future Internet initiatives, which are likely to incorporate revolutionary changes concerning interworking solutions, require a more efficient architecture for mobility-oriented environment. Development research, implementation, and deployment diverse groups of mobility management protocols. Currently observed convergence of systems and networks leads to standardization of used protocols and mechanisms. Mobility management based on IP protocols allows for the integration of different, often heterogeneous systems and networks, so closely fits to the above philosophy.
In conjunction with possibility of co-operation of network layer protocols with multiple lower layer transmission techniques and the lack of restrictions on the ways of realization of services in higher layers, the network layer is a natural place for locating the mobility management mechanisms. The direction of development of various techniques used in computer networks shows that in the near future the IP protocol will still remain a homogeneous network layer protocol used in different networking environments. However, they show significant limitations due to the lack of distinction between the identifier and mobile terminal locator offered via IP protocol, which is reflected in the week efficiency in terms of movement and switching.
We also presented ways to optimize these protocols and improve mechanisms handling mobile terminals. The current results allow to consider possible deployments of Internet-scale global systems. However, despite the advances in research, development and deployment of network-layer mobility management solutions, it is still necessary to remember the requirement of providing effective support for low-layer handover procedures, which will guarantee shorter transmission breaks and smaller distortions while switching between points of network attachement.
Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author s and the source are credited. Skip to main content Skip to sections. Advertisement Hide. Download PDF. Mobility management solutions for current IP and future networks. Open Access.
First Online: 17 March Over the past years we have been witnessing a very rapid growth in the popularity of various mobile devices processing and presenting digital data. Analyzing utilization of these devices one can observe a progressive convergence causing more and more functions to be integrated in a single device, thus increasing the range of their applications.
Current and estimated trends in popularity and usefulness of different portable devices reported by Cisco [ 1 ] are presented Fig. Open image in new window. The vast majority of multi-function terminals can use the IPv4 protocol, however more and more of them implement and utilize the new version—IPv6. The prevalence of the use of IP protocols provides opportunities to create new, useful services, as well as new uses of known solutions.
In order to provide proper mobility management, a number of fundamental issues must be solved, and a number of requirements for efficient Internet mobility support must be satisfied. ID for identification should be separated from LOC used for routing. Mobile hosts should not possess a static LOC. The control plane should be separated from the data plane.
Example scenarios include: a change of access point in a homogeneous network including a horizontal or intra-technology handover , a change of access technology both a vertical as well as inter-technology handover , a more advanced case of change of access router requiring network layer information like IP addressing inter- Access Network handover.
Terminal mobility can also be classified as inter- and intra-domain Fig. Such a distinction opens up the possibility to apply methods designed for specific functionality. Moreover, such mobility mechanisms are at best applicable only in the case of homogeneous networks and address only the link layer [ 21 ] mobility issues.
As such, they are not sufficient to address Internet mobility across heterogeneous networks. In general, due to network heterogeneity characteristics, it can be advantageous to locate mobility support functions at higher layers. Mobility in The whole handover handoff procedure is composed of a number of phases [ 21 ], among which detection, scanning and IEEE Minimization of scanning time Tscan can be achieved by employing one of the algorithms proposed in literature see e.
IEEE Reduction of IEEE Moreover, solutions of proprietary type proposed by hardware vendors, most frequently based on dedicated wireless network controllers, could be used as well. Table 2 Main sources of handover latency.
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Bold values represent the most time consuming procedures. It is evident that there are two most prominent sources of handover delay—the Link Layer handover itself and basic IP stack configuration. Table 3 Mobility impact on protocol layers and mobility management issues. Protocol layer Impact and proposed solutions Physical layer The radio link quality changes as the device moves. Data link layer The access link quality and availability changes, frame loss can occur, interface queue may encounter overflow.
Transport layer A session can be broken or its quality can deteriorate as the device moves. An example of MIPv6 handover is presented in Fig. When the MH leaves its home IP network, it detects foreign networks based on Agent Advertisement messages that can be solicited. To begin reception of data sent by other hosts to its home address, the MH updates bindings with its HA. The specification defines a method that the mobile node can use to discover MAPs, thus creating a comprehensive solution. HMIPv6 scenarios are illustrated in Fig.
It is also responsible for maintaining routes to all Mobile Hosts in the domain and forwarding traffic to and from them. SIP already supports user mobility Fig.
Mobile Inter-networking with IPv6: Concepts, Principles and Practices
Users after handover, should perform registration procedure, subsequently they are able to initiate or response invitation of a new call Fig. At the same time existing connections are broken due to IP address change Fig. However, the protocol has to be extended to support an active session while the user is moving. The problem of mobility in SIP is considered as increased roaming frequency and IP address change during the session.
If the mobile node moves during the session, it has to send a re-invitation Fig. Considering signaling overhead, SIP Mobility is a costly solution that has to be implemented for each application separately. After changing the point of network attachment, the mobile terminal shall inform RVS about the new IP address.
In color it was marked an additional layer between the network and transport layers. When the device wants to send data to another terminal, it creates an IP packet using EID tags in the fields of source and destination address. The MobilityFirst project proposes a new approach, according to which all nodes, both mobile and fixed, support a uniform set of mechanisms.
These ideas allow to prevent from implicit or explicit binding of sources and destinations to the current network topology. An example handover with handling disconnection is presented in Fig. The IP mobility protocols, described in the previous section, address different aspects of mobility, which can be used for classification of mobility management concepts and solutions. One such classification, based on the mobility execution layer, i.
The last group consists of application-layer solutions that are typically employed in heterogeneous networks to allow specific applications to function over different network technologies. IP mobility protocols may also be classified by their specific features. The basic characteristics of mobility support protocols are presented in Table 4. Different protocols should be used in different scenarios, depending on the mobility and handover type.
Link detection, registration type and address translation properties are strictly dependent on the protocol design. Several alternative IP mobility protocols were introduced that address deployment issues related to the Mobile IP. It advertises easier deployment over MIP at the cost of limited functionality e. Mobile NAT provides both micro- and macro-mobility support and can be deployed as a mobile IP replacement. Proxy mobile IP also falls into that category, as it addresses the problem of MIP implementation availability for the different types of mobile hosts by locating all necessary mechanisms at the network side.
Another, probably the most popular division of IP mobility management protocols refers to two main streams: local-scale or micro- management versus global-scale macro- management mobility proposals. The first group of protocols can be further split into a number of categories, presented in Fig. The initial development of mobility management solutions proceeded relatively slowly see Fig. More than 10 years have passed since specifying the first MIP solutions, to the point where one could see the first implementation suitable for use on large-scale production systems.
The vast majority of that time was devoted to theoretical research and development of effective optimizations of its operation, but still difficult for practical implementation. It was not until the relatively recent development of mobility management protocols at the network layer runs in conjunction with the development of practical network systems.
Mainly due to serious implementation difficulties, the need has forced the introduction of application layer mobility management solutions. Their development is characterized by the fast design and immediate implementation of a relatively large number of solutions dedicated to particular services or even specific implementations of services.
Global mobile data traffic dorecast, —, February Google Scholar. Lin, T. A terminal-assisted route optimized NEMO management. Telecommunication Systems , 42 , — CrossRef Google Scholar. Perkins, C. Johnson, D. Li, Q. Mobile IPv6: Protocols and implementation. San Francisco: Morgan Kaufman.
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Problem statement for distributed and dynamic mobility management. Wakikawa, R. Migrating home agents towards internet-scale mobility deployment. Jung, H. Distributed mobility control in proxy mobile IPv6 networks. Moskowitz, R. Host identity protocol.
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A survey of mobility management in next-generation all-IP-based wireless systems. Le, D. A review of mobility support paradigms for the internet. Campbell, A. IP micro-mobility protocols. Mobile Computing and Communications Review , 4 4 , 45— New inter-networking architecture for mobile oriented internet environment. In Proc. Wozniak, J. Berlin: Springer. Ramani, I. SyncScan: Practical fast handoff for IEEE Std.