scholarly journals A Call Admission Control Scheme for Multimedia Support Over IEEE 802.11 Wireless LANs

2012 ◽  
pp. 75-81
Author(s):  
Kauthale S. M.
Keyword(s):  
Real Time ◽  
Ieee 802.11 ◽  
Mac Protocol ◽  
Wireless Lans ◽  
Distributed Coordination ◽  
Channel Utilization ◽  
Time Data ◽  
Optimal Point ◽  
Available Bandwidth ◽  
Call Admission

These days there is an increasing interest for VoIP over wireless LANs. QoS support for real-time services like voice in the IEEE 802.11 WLAN is an important issue. Since IEEE 802.11 uses contention based MAC protocol – the distributed coordination function DCF, it is difficult to support the strict QoS requirements for voice in these networks. In this thesis a call admission scheme called “CAC” is proposed to achieve this goal, without changing the basic channel access mechanism of IEEE 802.11. CAC scheme regulates the arriving traffic in the wireless network to efficiently coordinate the medium among the contending traffic sources so that the network operates at optimal point, supporting the QoS requirements as well as providing better channel utilization. In this proposal, majority of available bandwidth is allocated to voice sources and remaining small amount is allocated for non real-time data traffic. It is expected that the proposed CAC scheme can well support strict QoS requirements, such as high throughput and low delay at the same time achieve a high channel utilization.

Cross-Layer Scheduling with QoS Support over a Near-Optimum Distributed Queueing Protocol for Wireless LANS

2010 ◽  
pp. 30-52
Author(s):  
E. Kartsakli ◽  
J. Alonso-Zárate ◽  
L. Alonso ◽  
C. Verikoukis
Keyword(s):  
Mac Protocol ◽  
Wireless Lans ◽  
Service Differentiation ◽  
Heterogeneous Traffic ◽  
Cross Layer ◽  
Traffic Flows ◽  
Data Traffic ◽  
Mac Layers ◽  
Qos Guarantees ◽  
Distributed Queueing

Distributed Queueing Collision Avoidance (DQCA) is an efficient MAC protocol designed for infrastructure Wireless LANs. In this chapter, a thorough description of the protocol is given, along with a set of protocol rules and an example of its operation. In continuation, four algorithms are proposed that alter the FIFO scheduling order of DQCA in order to meet specific network requirements. The proposed schemes combine the efficiency of opportunistic scheduling with the QoS provisioning through service differentiation. The opportunistic policy encourages transmissions at higher rates when the channel condition is good and is implemented through a cross-layer dialogue between the PHY and the MAC layers. The key idea of service differentiation is to assign priorities to traffic flows with different requirements in order to provide QoS guarantees. The throughput, delay and jitter performance of the proposed schemes have been evaluated through simulations for a scenario with heterogeneous traffic of voice, video, best-effort and background data traffic flows.

scholarly journals A Real-Time, Distributed, Directional TDMA MAC Protocol for QoS-aware Communication in Multi-hop Wireless Networks

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Shivam Garg ◽  
Venu Sri Sushma Kuchipudi ◽  
Elizabeth Serena Bentley ◽  
Sunil Kumar
Keyword(s):  
Wireless Networks ◽  
Real Time ◽  
Mac Protocol ◽  
Tdma Mac

Adaptive coding scheme for wireless LANs with CSMA/CA MAC protocol

1998 ◽  
Vol 34 (15) ◽  
pp. 1450 ◽  
Author(s):  
Yu-Sun Liu ◽  
Shu-Wei Wu
Keyword(s):  
Mac Protocol ◽  
Wireless Lans ◽  
Adaptive Coding ◽  
Coding Scheme

Performance Analysis of a Flexible MAC Protocol for Real-Time Services in Vehicular Ad-Hoc Networks

2005 ◽  
Vol 12 (3) ◽  
pp. 147-157
Author(s):  
Giuseppe Caizzone ◽  
Paolo Giacomazzi ◽  
Luigi Musumeci ◽  
Gabriella Saddemi ◽  
Giacomo Verticale
Keyword(s):  
Performance Analysis ◽  
Ad Hoc Networks ◽  
Real Time ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Hoc Networks
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