Determining the call admission region for real-time heterogeneous applications in wireless TDMA networks

IEEE Network ◽  
1998 ◽  
Vol 12 (2) ◽  
pp. 38-47 ◽  
Author(s):  
J.M. Capone ◽  
I. Stavrakakis
Keyword(s):  
Real Time ◽  
Call Admission ◽  
Admission Region

Enhanced Adaptive Call Admission Control Scheme With Bandwidth Reservation for LTE Networks

2021 ◽  
Vol 12 (1) ◽  
pp. 23-42
Author(s):  
Maniru Malami Umar ◽  
Amimu Mohammed ◽  
Abubakar Roko ◽  
Ahmed Yusuf Tambuwal ◽  
Abdulhakeem Abdulazeez
Keyword(s):  
Real Time ◽  
Admission Control ◽  
Call Admission Control ◽  
Blocking Probability ◽  
Degradation Mechanism ◽  
Radio Resource Management ◽  
System Level ◽  
Bandwidth Reservation ◽  
Lte Networks ◽  
Call Admission

Call admission control (CAC) is one of the radio resource management techniques that regulates and provide resources for new or ongoing calls in the network. The existing CAC schemes wastes bandwidth due to its failure to check before degrading admitted real-time calls and it also increases the call dropping probability (CBP) and calling blocking probability (CBP) of real-time calls due to the delay incurred when bandwidth is degraded from them. This paper proposed an enhanced adaptive call admission control (EA-CAC) scheme with bandwidth reservation. The scheme employs a prior-check mechanism that ensured bandwidth to be degraded will be enough to admit the new call request. It further incorporates an adaptive degradation mechanism that degrades non-real time calls before degrading the RT calls. The performance of the EA-CAC scheme was evaluated against two existing schemes using Vienna LTE system level simulator. The EA-CAC scheme exhibits better performance compared to the two schemes in terms of throughput, CBP, and CDP of RT calls without sacrificing the performance of NRT calls.

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.

On Per-Session End-to-End Delay and the Call Admission Problem for Real-Time Applications with QOS Requirements

1994 ◽  
Vol 3 (4) ◽  
pp. 429-457 ◽  
Author(s):  
David Yates ◽  
James Kurose ◽  
Don Towsley ◽  
Michael G. Hluchyj
Keyword(s):  
Real Time ◽  
Call Admission ◽  
End To End Delay ◽  
Real Time Applications ◽  
End To End
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