Scheduling Scheme for Variable Bit Rate Traffic in IEEE 802.11e Wireless LANs

2006 ◽  
Author(s):  
Rongbo Zhu ◽  
Yuhang Yang
Keyword(s):  
Wireless Lans ◽  
Ieee 802.11E ◽  
Variable Bit Rate ◽  
Bit Rate ◽  
Scheduling Scheme

Variable bit rate VOiP in IEEE 802.11e wireless LANs

2008 ◽  
Vol 15 (1) ◽  
pp. 56-62 ◽  
Author(s):  
F.H. Li ◽  
Yang Xiao ◽  
Jingyuan Zhang
Keyword(s):  
Wireless Lans ◽  
Ieee 802.11E ◽  
Variable Bit Rate ◽  
Bit Rate

scholarly journals A IEEE 802.11e HCCA Scheduler with a Reclaiming Mechanism for Multimedia Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-22 ◽  
Author(s):  
Anna Lina Ruscelli ◽  
Gabriele Cecchetti
Keyword(s):  
Traffic Management ◽  
Scheduling Algorithm ◽  
Multimedia Applications ◽  
Service Differentiation ◽  
Transmission Time ◽  
Ieee 802.11E ◽  
Variable Bit Rate ◽  
Bit Rate ◽  
Positive Effects ◽  
Dynamic Update

The QoS offered by the IEEE 802.11e reference scheduler is satisfactory in the case of Constant Bit Rate traffic streams, but not yet in the case of Variable Bit Rate traffic streams, whose variations stress its scheduling behavior. Despite the numerous proposed alternative schedulers with QoS, multimedia applications are looking for refined methods suitable to ensure service differentiation and dynamic update of protocol parameters. In this paper a scheduling algorithm,Unused Time Shifting Scheduler(UTSS), is deeply analyzed. It is designed to cooperate with a HCCA centralized real-time scheduler through the integration of a bandwidth reclaiming scheme, suitable to recover nonexhausted transmission time and assign that to the next polled stations. UTSS dynamically computes with anO(1)complexity transmission time providing an instantaneous resource overprovisioning. The theoretical analysis and the simulation results highlight that this injection of resources does not affect the admission control nor the centralized scheduler but is suitable to improve the performance of the centralized scheduler in terms of mean access delay, transmission queues length, bursts of traffic management, and packets drop rate. These positive effects are more relevant for highly variable bit rate traffic.

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