Handover Management for VoWLAN Based on Estimation of AP Queue Length and Frame Retries

Niswar, Muhammad; Kashihara, Shigeru; Tsukamoto, Kazuya; Kadobayashi, Youki; Yamaguchi, Suguru

doi:10.1587/transinf.e92.d.1847

Cited by 4 publications

(7 citation statements)

References 12 publications

(15 reference statements)

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“…As an RTS frame is always transmitted at the lowest rate (e.g., 6 Mb/s in 802.11a/g and 1 Mb/s in 802.11b), an MN can appropriately detect the change of wireless link quality. In our previous study [8], we found that an RTS retry ratio of less than 0.6 satisfies adequate VoIP call quality, and we suggest it as a threshold value for initiating HO in this study.…”

Section: Frame Retriessupporting

confidence: 57%

“…That is, VoIP packets to MNs are liable to experience large queuing delay or packet loss due to increase in queue length or buffer overflow in the AP buffer because each MN and AP has almost the same priority level of frame transmission by following the CSMA/CA scheme. In our previous study [8], we found that Request-to-Send (RTS) frame retries and Round-Trip Time (RTT) between MN and AP can be potential MN-initiated HO triggers for 802.11g. We briefly describe these triggers in the following subsections.…”

Section: Handover Triggers For 80211mentioning

confidence: 99%

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Vertical Handover Management for VoIP Session over Broadband Wireless Networks

Niswar¹,

Kashihara²,

Yamaguchi³

2013

IJCNS

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Today, wireless LAN (IEEE802.11g/n) has been the dominant wireless network that can provide high data rates in a limited coverage area. While emerging mobile WiMAX (IEEE802.16e) can provide a wireless broadband access to mobile users in a wide coverage area. These two different technolgies will co-exist while complementing each other in some regions, hence, a mobile node (MN) with dual interfaces traverses and executes many handovers (HOs) between 802.11g and 802.16e. Meanwhile, there is a huge demand for Voice over IP (VoIP) service over wireless networks. However, VoIP is a delay and loss sensitive application, hence, VoIP session is more likely to be deteriorated during HO between 802.11g and 802.16e. In order to maintain quality of VoIP session during HO, we proposed Vertical Handover Management (VHM) for VoIP session that focuses on HO initiation and decision strategy according to the wireless link condition and congestion state of wireless networks. The VHM exploits request to send (RTS) retries and round trip time (RTT) between an MN and an access point in an 802.11g interface as well as a carrier to interference noise ration (CINR) level and MN's queue length of an 802.16e interface as HO triggers. We then conducted simulation experiments to evaluate the effectiveness of our proposed VHM using QualNet 4.5. Our simulation results show that our proposed VHM can preserve the quality of VoIP session during such HOs.

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Section: Frame Retriessupporting

confidence: 57%

Section: Handover Triggers For 80211mentioning

confidence: 99%

Vertical Handover Management for VoIP Session over Broadband Wireless Networks

Niswar¹,

Kashihara²,

Yamaguchi³

2013

IJCNS

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“…The MNs implement the VoIP call with the CN. The new NHM working in a multi-homing is similar to [39][40] with respect to improve the VoIP session conservation among the MN and CN, it must be correctly switched among the single-casting and bi-casting modes in reply to wireless network rules. Single-casting mode known as the MN communicates with a CN using only one IF.…”

Section: Resultsmentioning

confidence: 99%

Ant Colony Optimization Based Handoff Scheme and Verifiable Secret Sharing Security with M-M Scheme for VoIP

Shankar¹,

Eswaramoorthy²

2017

IJIES

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Voice over Inter Protocol (VoIP) empowers in the integration of voice data over IP networks, minimizing the cost of network transmission for helping users of IP protocol. Robust and effective procedure of handoff is introduced for increasing the quality and the dependability of the networks. Ant Colony Optimization (ACO) is presented for the handoff mechanism and Mean Opinion Score (MOS) is observed to be the fitness value for obtained measurements of the assessment of voice quality. In this research, the scheme of Multiplex-Multicast (M-M) is proposed that will improve the capability of VoIP in WLAN to 100% in the form of an infrastructure Basic Service Set (BSS). This research work deals with the security features of VoIP in order to enhance the quality making use of Verifiable Secret Sharing (VSS) with the help of M-M scheme. The M-M scheme will eliminate the downlink VoIP traffic ineffectiveness through the multiplexing of the packets from different VoIP streams into one multicast packet for transmitting over the WLAN. The results from simulation indicate the advancements in the security enhancements making use of the proposed schemes. The average Round Trip Time (RTT) results of the proposed VSS with M-M are 0.30436 milliseconds, whereas average RTT is 0.3598 milliseconds and 0.43604 milliseconds for VSS and Shamir SS methods respectively. It concludes that the proposed VSS with M-M takes lesser RTT results when compared to existing methods.

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“…Although the results indicate that the AP's queue length has a large impact on VoIP communication quality, how can MSs detect the increase in the AP's queue length without modifying an AP? We then proposed estimating the AP's queue length based on the RTT between an MS and an AP (Niswar et al, 2009a). Note that in this chapter the RTT between the MS and the AP is called Wireless RTT (WiRTT).…”

Section: Handover Triggers For Multi-rate and Congested Wlansmentioning

confidence: 99%

“…We then proposed an extended handover management method based on these triggers (Niswar et al, 2009a). To support soft handover on an end-to-end basis, the handover management method also supports multi-homing, cross-layer architectures, a multi-path transmission function, and a handover manager (HM) similar to the previous method .…”

Section: Handover Management For Multi-rate and Congested Wlansmentioning

confidence: 99%

End-to-End Handover Management for VoIP Communications in Ubiquitous Wireless Networks

Kashihara¹,

Niswar²,

Taenaka³

et al. 2011

VoIP Technologies

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There have been numerous discussions about supporting an MS's mobility among wireless networks with different network addresses. In this section, we focus especially on handover management needed to keep VoIP communication quality during such movement. As End-to-End Handover Management for VoIP Communications in Ubiquitous Wireless Networks 3 described in Section 1, in the ubiquitous wireless networks, an MS may experience many handovers with changes of IP addresses. Mobile IPv4 (MIPv4) (Perkins, 2002) and Mobile IPv6 (MIPv6) (Johnson et al., 2004) have received significant interest as a network-based mobility management method to support mobility with changes of IP address. To avoid communication termination due to a change of IP address, MIPv4/v6 employs agent servers in the wireless networks, and the agent servers manage the location of MSs and control packet transmission between an MS and a corresponding station (CS). Although the agent servers do keep communication connections even when the IP address of the MS is changed, MIPv4/v6 is not enough to provide a seamless handover. To move to another wireless network, an MS has to perform layer 2 and 3 handover processes and it cannot send and receive any packets during that time. Furthermore, location registration with the agent servers also introduces an interruption delay. Thus, such interruptions lead to degradation of VoIP communication quality.To support seamless handover with MIPv4/v6, many extension methods have been studied. In Hierarchical Mobile IPv6 (HMIP) (Soliman et al., 2008), an additional server reduces the registration period inside the same domain. However, when an MS moves between different domains, the HMIP eventually requires layer 2 and 3 handover processes and a location update like the original MIPv4/v6. In Fast handover for Mobile IPv6 (FMIP) (Koodli, 2005), additional functions are added to allow an MS to update the location before executing handover. However, FMIP also needs layer 2 and 3 handover processes after updating the location. Therefore, it does not completely eliminate communication interruption due to layer 2 and 3 handover processes (Kim et al., 2005) (Montavont & Noel, 2003). In addition, since MIP-based methods require special agent servers, they cannot easily be used in ubiquitous wireless networks because a different provider independently manages each wireless network. Thus, it is desirable to provide an end-to-end handover management method without extra network facilities. As for end-to-end handover approaches, the mobile Stream Control Transmission Protocol (mSCTP) (Xing et al., 2002) and the Media Optimization Network Architecture (MONA) (Koga et al., 2005) have been proposed. The mSCTP is a mobile extension of the Stream Control Transmission Protocol (SCTP) (Stewart, 2007), and allows an MS to simultaneously use two or more wireless interfaces for communications, i.e., multi-homing architecture. Compared with the single-homing architecture, the multi-homing architecture can contribute to elimination of communic...

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Handover Management for VoWLAN Based on Estimation of AP Queue Length and Frame Retries

Cited by 4 publications

References 12 publications

Vertical Handover Management for VoIP Session over Broadband Wireless Networks

Vertical Handover Management for VoIP Session over Broadband Wireless Networks

Ant Colony Optimization Based Handoff Scheme and Verifiable Secret Sharing Security with M-M Scheme for VoIP

End-to-End Handover Management for VoIP Communications in Ubiquitous Wireless Networks

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