Improving layer 3 handoff delay in IEEE 802.11 wireless networks

Forte, Andrea; Shin, Sangho; Schulzrinne, Henning

doi:10.1145/1234161.1234173

Cited by 16 publications

(13 citation statements)

References 10 publications

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“…The condition for a handover to complete successfully is: d handover = d max + v * t signaling . The major delay in the signaling path is caused by the 2G/3G attach and PDP context activation for WLAN-to-Cellular handover, amounting to 4-8 s [10], and WLAN scan and DHCP operation which requires 0.5 s only for DHCP address acquiring but can be reduced to less than 100 ms [11].…”

Section: Uncertainty Factors In Location-based Handovermentioning

confidence: 99%

“…GPRS stands for a GPRS class 10 modem (dynamical allocation of 4 + 1, or 3 + 2 Timeslots for Downlink/Uplink, coding scheme 3/4) and HSDPA was measured using a HSDPA category 12 device (the mobile network theoretically supports 7.2 Mbit/s Downlink and 384 Kbit/s Uplink). The values for GPRS attach and PDP context activation, as well as for WLAN scan/DHCP duration have been published in [10] and [11]. Fig.…”

Section: Location-based Handover Durationmentioning

confidence: 99%

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Location-based assisted handover for the IP Multimedia Subsystem

Fabini

Pailer²,

Reichl

2008

Computer Communications

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Section: Uncertainty Factors In Location-based Handovermentioning

confidence: 99%

Section: Location-based Handover Durationmentioning

confidence: 99%

Location-based assisted handover for the IP Multimedia Subsystem

Fabini

Pailer²,

Reichl

2008

Computer Communications

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“…As experimental results confirmed, the service performance is very likely to suffer from significant degradation when the HAC switching is performed from a highbandwidth access network to another with low bandwidth. The HAC switching delay can be improved further by using more powerful servers and efficient configuration protocols such as the Dynamic Registration and Configuration Protocol (DRCP) [216]. Another possible approach is to apply a multi-buffer structure, giving to each interface its own send buffer, to ensure path independence as far as transmission is concerned.…”

Section: Future Workmentioning

confidence: 99%

Consumer-Oriented Incoming Call Connection Service for a Ubiquitous Consumer Wireless World

Ганчев

O’Dróma

Wang

2008

Wireless Pers Commun

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This thesis proposes a novel consumer-oriented Incoming Call Connection (ICC) service as an important enabling infrastructural component of the recently proposed ubiquitous consumer wireless world (UCWW), a new Consumer-centric Business Model (CBM) environment for wireless communications. The ICC solution proposed here will be offered by third-party providers who are autonomous of the access network providers. Compared to the present ICC service in the legacy subscriber-based networks, the consumeroriented ICC service will offer to mobile users greater flexibility and management control over incoming calls, enable users to receive incoming calls via multiple access networks/providers by means of a single identity, support user-driven, seamless, network-transparent Hot Access network Change (HAC), largely eliminate roaming charges and develop a new wireless networking business opportunity among other ben- Furthermore, the thesis elaborates a generic CBM-ICC service scenario, which shows how the CBM-ICC service offers to mobile users greater freedom and operation control over incoming calls, enables the novel attribute of users being empowered to receive incoming calls simultaneously, and otherwise, from various homogeneous and heterogeneous access networks, owned by the same or different providers, and enables user-driven HAC on active calls in keeping with, or matched to, user's Always Best Connected and Best Served (ABC&S) policies. A CBM-ICC proof-of-concept system-level testbed is implemented to perform experimental tests, probe different communications scenarios, evaluate the service performance, and further elaborate the service architecture. In this, approaches towards evaluating the performance of the CBM-ICC service based on designed testbed are elaborated, and sample numerical results are presented and analyzed. DeclarationThis thesis is presented in fulfillment of the requirements for the degree of Doctorate of Philosophy. This thesis has not been submitted to any other University or higher education institution, or for any other academic award in this University. Where use has been made of the work of other people it has been fully acknowledged and fully referenced. Signed:Date:Ohana means family.Family means nobody gets left behind, or forgotten.Dedicated to Mum, Dad and my wife.Without your love and support I would not be at this point today.Dedicated to the loving memory of my grandma.

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“…As mentioned in Section I, in open networks the scanning process is responsible for more than 90% of the total handoff time. The cache reduces the L2 handoff time to only a few milliseconds (see Table I) and cache misses due to errors in movement prediction introduce only a few milliseconds of Here, we consider the same caching mechanism used in [27]. In order to support multi-homed routers, however, we use the subnet address as subnet identifier.…”

Section: A Overviewmentioning

confidence: 99%

“…The new IP address is usually acquired by using the DHCP infrastructure. Unfortunately, the typical DHCP procedure can take up to one second [27].…”

Section: L3 Cooperation Protocolmentioning

confidence: 99%

Cooperation Between Stations in Wireless Networks

Forte

Schulzrinne

2007

2007 IEEE International Conference on Network Protocols

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Abstract-In a wireless network, mobile nodes (MNs) repeatedly perform tasks such as layer 2 (L2) handoff, layer 3 (L3) handoff and authentication. These tasks are critical, particularly for real-time applications such as VoIP. We propose a novel approach, namely Cooperative Roaming (CR), in which MNs can collaborate with each other and share useful information about the network in which they move.We show how we can achieve seamless L2 and L3 handoffs regardless of the authentication mechanism used and without any changes to either the infrastructure or the protocol. In particular, we provide a working implementation of CR and show how, with CR, MNs can achieve a total L2+L3 handoff time of less than 16 ms in an open network and of about 21 ms in an IEEE 802.11i network. We consider behaviors typical of IEEE 802.11 networks, although many of the concepts and problems addressed here apply to any kind of mobile network.

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Improving layer 3 handoff delay in IEEE 802.11 wireless networks

Cited by 16 publications

References 10 publications

Location-based assisted handover for the IP Multimedia Subsystem

Location-based assisted handover for the IP Multimedia Subsystem

Consumer-Oriented Incoming Call Connection Service for a Ubiquitous Consumer Wireless World

Cooperation Between Stations in Wireless Networks

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