Tìm thấy 20+ kết quả cho từ khóa "IP mobility"
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Mobility Management – Discussing what ‘IP mobility’ is, and summaris- ing, analysing and comparing some of the (many) protocols to solve it (Chapter 5).. analysing some of the current and proposed protocols for QoS. and proposing a solution for ‘IP for 3G’ (Chapter 6).. To provide a build-up to Chapter 7, which aims to bring many of the issues together and provide our perspective on how ‘IP for 3G’ could (or should) develop..
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With controller-based architectures, there is only one IP to know—that of the controller. One vendor performs the 802.11 encryption operations on the controller itself. others retain that functionality in the access points.. But most notably for voice mobility, the controller-based architectures implement a kind of transparent “Mobile IP.” Data is tunneled from the access point to the controller and vice versa.
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Cellular-centric FMC fits directly into the existing mobility architecture for the carrier. As far as the rest of the carrier’s network is concerned, the phone is using a typical base station on a typical base station controller. The mobility gateway just happens to be that controller, and tunnels the signaling and bearer traffic over IP, rather than continuing down on circuits to the remaining parts of the network.
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This is essentially an instantiation of the end-to-end principle of IP design. scalability of the IP mobility protocol by reducing the number of messages sent. RSVP sets up QoS based on the routing path to the destination address of the end node. Some of the details differ between the various proposals, for example:. independent of the radio technology, which makes it universal. The user knows the IP address of the terminal the other user is at..
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IP datagram IP destination address 107 IP dial-up 49. IP differentiated services 99 IP dotted decimal 70 IP encapsulation 102 IP FLAGS 105 IP forwarding 1 16. IP FRAGMENT OFFSET 105 IP gateway IP header length 99. IP IDENTIFICATION 105 IP mobility IP more fragments 106 IP multicast 694 IP multicasting 68, 321 IP next generation 602 IP options 107 IP padding 107 IP payload 107 IP precedence 99. IP record route option 109 IP reserved prefixes. IP router IP routing 1 16.
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The E-model makes plenty of room for non-IP effects on voice quality, and we would be wise to consider them here, even though the previous few sections chose to focus only on the network effects.. Is the network provisioned well enough that calls go through or are held predictably and reliably? Is the voice mobility network laid out well enough that users know that every point in the campus is a hot spot, or are some areas weak or dead?.
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Thankfully, PBX features are generally independent of voice mobility networking, in the sense that every PBX has a good number of features, and these features will generally work on IP PBXs, no matter what IP-based protocol the user is using. Their systems determine how to find out the network location of the other party being called, whether the other party can be reached or is out of the network, and help establish the flow of voice traffic..
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One of the difficult problems of IP mobility is assuring a constant level of QoS.. When the quality of the radio signal in the MT to the current AR (called “old AR”, AR1) drops, the terminal will start a handover procedure to a neighbouring AR (called “new AR”, AR2) with better signal and from which it has received a beacon signal with the network prefix advertisement. This AR will forward the handover request to both the new AR and to the QoS Broker.
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But for Internet Protocol (IP)-based telephone networks, the PBX is more of the central call manager, providing for the list of extensions—users, basically, as well as the telephone numbers each user has—and the dialing plan—the notion of how to route calls based on the phone numbers dialed. PBXs also implement all of the advanced features of voice mobility calling, including voicemail, call forwarding, and multiple ring.
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The UMA name for the FMC mobility gateway is the UMA Network Controller (UNC). As the user hands out and in from the mobile operator’s network, the transitions which occur appear to the GSM network as nothing more than an inter-BSC handoff. The one wrinkle to this is that the mobile phone can be in a geographically distant area from the original mobile network. In this case, because the IP traffic always goes back to the home MSC, the handoff could very well be across MSCs and the PSTN..
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Once a flow is established, the sender sets the ECN bit, bit 6, in the DSCP usage of the TOS field in IP (Section 4.2.2, Table 4.14). Introduction to Wi-Fi. The goal of the chapter is to provide a solid background on Wi-Fi technology, looking at what needs to be done to ensure that wireless local area networks operate well as both a data network and a crucial leg of voice mobility solutions.
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AAA and Network Security for Mobile Access Radius Diameter EAP PKI and IP Mobility PASSWORD: www.AvaxHome.ru. Wiley.Wireless.and.Mobile.All-IP.Networks.Nov.2005.eBook-LinG.7z.html Newnes.Designing.Mobile.Autonomous.Robots.ebook-TLFeBOOK.rar.html PASSWORD: ebooksatkoobe. Introduction.to.Autonomous.Mobile.Robots.ebook-TLFeBOOK.rar.html PASSWORD: ebooksatkoobe.
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How can we have access to a way of measuring the quality of voice over IP networks, measuring the contribution to the distortion caused uniquely by the voice mobility network? Once again, the ITU is here to the rescue. ITU G.107 introduces the E-model, a computational model that takes into account measurable network effects to determine the call quality that should have been expected for the call as seen on the network..
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The wireline portion of the voice mobility network should be treated with the same level of concern as the service network for data usage would. If a network is subsequently upgraded to voice over IP, those same locations may be used for placing the Ethernet switches that concentrate the desk ports and send them to the voice network, towards the PBX.
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This allows the codec to be quite flexible for voice mobility, and should be a preferred option..
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Voice Mobility over Wi-Fi. In the previous chapter, you learned what Wi-Fi is made of. From here, we can look at how the voice technologies from previous chapters are applied to produce voice mobility over Wi-Fi.. The keys to voice mobility’s success over Wi-Fi are, rather simply, that voice be mobile, high-quality, secure, and that the phones have a long talk and standby time.
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Alliance, 279–280 voice immobility, 1 voice lines, terminating, 346 voice mobility. concerns for, 289 described, 1–2 introduction to, 1–4 over Wi-Fi, 203–288 RF modifications for, 280–286 technologies addressing with. Wi-Fi, 214–230 technology behind, 5–55 Wi-Fi Alliance certifications for,. 277–280 WiMAX problem, 305 voice mobility deployments in the 2.4GHz band, 284 challenges to, 148 voice mobility devices. categories using Wi-Fi, 105–. voice mobility handset.
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mobility, 85 IPv6.
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Figure 7.5 shows an All-IP network architecture specified in R4/R5 of 3GPP. Although R4/R5 attempts to carry out all transmission functions through IP transport, the CS domain and the PS domain remain separated, and the packet-switching system is still based on the General Packet Radio Service (GPRS). Its mobility function is based on the existing mobility control scheme, and there is much room left to study in regard to the introduction of IP mobility, such as mobile IP.
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Voice mobility is centered around the concept that the call should follow the user. Cellular networking remains the predominant method that people get voice mobility today.. comprehensive voice mobility network.. Cellular networks the calls they provide address three basic and somewhat independent concerns for voice mobility:. Each of the three areas figure into the architecture of mobile telephone networks.