A dynamically adaptable polling scheme for voice support in IEEE802.11 networks

Ziouva, E.; Antonakopoulos, Theodore

doi:10.1016/s0140-3664(02)00129-9

Cited by 14 publications

(7 citation statements)

References 15 publications

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“…The biggest disadvantage of PCF is that a lot of bandwidth is wasted by sending polls and NULL data when stations have no data to send. In order to reduce the overhead and increase the channel utilization, some works have investigated the performance of the PCF when used to support real-time traffic, and modified the standard PCF [4][5][6][7][8][9][10][11].…”

Section: Related Workmentioning

confidence: 99%

“…A. Kanjanavapastit proposes a modified PCF [6,7], modified PCF reduces the channel under-utilization due to polling overheads and null packets that occurs in the standard PCF, and increase the utilization of channel. Meanwhile, the dynamically polling strategy is adopted to decrease the overhead due to NULL package and CF-Poll when stations have no data to send [10,11]. Shuai [12] modified PCF to improve the WLAN real-time performance in the large telescope control system.…”

Section: Related Workmentioning

confidence: 99%

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Research of Real-Time Wireless Networks Control System MAC Protocol

Xiaoying¹,

Zhang²

2010

JNW

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Data transported through the control system of WLAN included: burst real-time data (BRD), periodical real-time date (PRD) and non-real-time data (NRD). Priority ranged from the high level to the low level and distinguished them by different inter frame space (IFS). BRD station sent RTS to reserve channel freeing SIFS and transmitted burst data after SIFS; PRD transported through AP polling; non-real-time data transport through CSMA/CA protocol at the stage of DCF. This paper presented the new solution(limited and polling backoff, LPB) to solve the conflict, set conflict threshold, adopted modified backoff algorithm of burst real-time data, improved the performance of real-time data and guaranteed the delay to keep the delay limited. The analysis and simulation show that the new protocol can promote the response of real-time data and make the delay limited.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Research of Real-Time Wireless Networks Control System MAC Protocol

Xiaoying¹,

Zhang²

2010

JNW

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“…A dynamically adaptable polling scheme is introduced in [13] in order to support voice traffic over WLANs. In particular, the authors in [13] propose a cyclic shift and a station removal polling scheme that is implemented on APs and does not require modifications to the mobile station medium access mechanism.…”

Section: Related Workmentioning

confidence: 99%

Always Best Packet Switching: the Mobile VoIP Case Study

Ghini¹,

Lodi²,

Panzieri

2009

JCM

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Currently, a mobile device equipped with multiple heterogeneous wireless Network Interface Cards (NICs), cannot take fully advantage of its capabilities as the conventional mobility management approach allows it to select and use only one of its NICs at a time. In contrast to this approach, we propose the so-called Always Best Packet Switching (ABPS) model that allows applications to use simultaneously all the available NICs, and switch each given IP datagram through the most suitable NIC, depending on the characteristics of the datagram itself. Specifically, we show that the ABPS model enables mobile applications to create policies for load balancing and recovery purposes in order to support effectively mobile multimedia services. In particular, in this paper we describe a cross-layer mechanism, termed Robust Wireless Multi-Path Channel (RWMPC) that adopts the ABPS model in order to meet effectively interactivity and low packet loss Quality of Service (QoS) requirements of Voice over IP (VoIP) applications, running on mobile hosts equipped with multiple WLAN NICs. By Exploiting the RWMPC services, VoIP applications can establish and maintain separate wireless links with different access points providing access to, possibly independently managed, wireless networks, and select for each UDP datagram the best link to be used for communication purposes. In essence, the RWMPC mechanism monitors each link in use, and notifies the application if detects that a datagram has been lost. In this case, the application retransmits the datagram using an alternative link, available through one of the interfaces homed in the mobile host.We have carried out an experimental evaluation of our mechanism in a real wireless scenario through the emulation of a VoIP application. The results we have obtained from this evaluation are discussed in this paper and confirm the effectiveness of our approach.

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Section: Related Workmentioning

confidence: 99%

Design of WLAN Control System Burst Data MAC Protocol

Huang

Xiaoying

2009

2009 International Forum on Computer Science-Technology and Applications

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Data transported through the control system of WLAN included: burst data (BD) and non-real-time data (NRD), distinguished each priority by different inter frame space (IFS). BD wait for SIFS, NRD must wait for DIFS while channel is idle. To improve the real-time of burst data of WLAN control system, design WLAN control MAC, BD stations sent RTS/CTS to reserve channel freeing SIFS; nonreal-time data transport through standard CSMA/CA and binary exponential random backoff algorithm (BEB). This paper presented the polling backoff algorithm (PBA) to solve the conflict of BD, improved the performance of real-time data and guaranteed the delay to keep the delay limited. Analysis and imitation demonstrates that wireless burst data MAC protocol proposed is preferable to standard wireless media access protocol for network control system.

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A dynamically adaptable polling scheme for voice support in IEEE802.11 networks

Cited by 14 publications

References 15 publications

Research of Real-Time Wireless Networks Control System MAC Protocol

Research of Real-Time Wireless Networks Control System MAC Protocol

Always Best Packet Switching: the Mobile VoIP Case Study

Design of WLAN Control System Burst Data MAC Protocol

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