QoS Assured Uplink Scheduler for WiMAX Networks

Rengaraju, Perumalraja; Lung, Chung-Horng; Srinivasan, Anand

doi:10.1109/vetecf.2010.5594592

Cited by 10 publications

(10 citation statements)

References 11 publications

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“…The MAC layer functions (Rengaraju et al, 2010) of IEEE 802.16e are described in (Rengaraju et al, 2010) IEEE 802.16e is expected to provide QoS for fixed and mobile users. QoS depends upon a number of implementation details like scheduling, buffer management and traffic shaping.…”

Section: Wimaxmentioning

confidence: 99%

Comparison for Wimax Scheduling Algorithms and Proposal Quality of Service Improvement in Wimax Networks

Nandhini¹

2014

American Journal of Applied Sciences

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The objective of the broadband wireless technologies is to ensure the end to end Quality of Service (QoS) for service classes. Wimax is a revolution in wireless networks which could support real time multimedia services. In order to provide QoS support and efficient usage of system resources an intelligent scheduling algorithm is needed. The design of detailed scheduling algorithm is a major focus for researchers and service providers. In this study, a channel aware cross-layer scheduling algorithm for Wimax networks has been proposed. This scheme employs Signal to Noise Ratio (SNR) value which allocates bandwidth based on the information about the quality of the channel and service requirements of each connection. The proposed algorithm is described in detail and evaluated through series of simulation. The simulation results prove that the proposed algorithm reduces the packet loss rate and delay and thus improves throughput by 12.8%.

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Section: Wimaxmentioning

confidence: 99%

Comparison for Wimax Scheduling Algorithms and Proposal Quality of Service Improvement in Wimax Networks

Nandhini¹

2014

American Journal of Applied Sciences

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“…In our previous work [7], we compared the different scheduling schemes for fixed and mobile WiMAX networks and we simulated the (P+E) scheduler for uplink scheduling. The (P+E) scheduler is simple, but it provides BW and delay guarantee.…”

Section: Related Work and Motivationmentioning

confidence: 99%

“…Finally, the CAC considers the BW degradation policy on BE traffic, only when the reserved BW for HCs is allocated to the BE connections. For the packet scheduling, we modified our earlier (P+E) scheduler [7] to work for multihop downlink traffic. If the BW degradation policy is used in CAC, the packet scheduling should ensure the BW degradation on BE traffic only.…”

Section: Related Work and Motivationmentioning

confidence: 99%

“…Similarly, in the design of existing schedulers for WiMAX network [2,6,7], the delay requirement for multihop users may not be satisfied. In addition to that, when the system reaches the full load condition, providing both QoS differentiation between real time and non-real time services and minimizing delay performance of multihop users are not considered.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive admission control and packet scheduling schemes for QoS provisioning in multihop WiMAX networks

Rengaraju

Lung

Srinivasan

2012

2012 8th International Wireless Communications and Mobile Computing Conference (IWCMC)

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Selection of Call Admission Control (CAC) and packet scheduling are crucial for multihop WiMAX networks to satisfy the Quality of Service (QoS) for end users. In this paper, we propose an adaptive CAC method and two different scheduling schemes for multihop WiMAX networks. The proposed CAC in the multihop Base Station (BS) reserves some bandwidth (BW) for the mobile users and changes the BW reservation adaptively based on most recent requests from the handover users. When there are few or no handover users exist in a network, the remaining reserved BW is allocated to low priority Best Effort (BE) users for effective BW utilization. While admitting the New Calls (NCs) or Handover Calls (HCs), the BS verifies both BW and multihop delay requirements to satisfy the QoS of the call. Next, we propose two downlink scheduling algorithms (P+E) and (P+TB) for the BS in multihop networks. The (P+E) scheduler combines the Priority and Earliest Due Date (EDD) scheduling methods, while the (P+TB) scheduler combines the Priority and Token Bucket (TB) scheduling methods. When the network is lightly or moderately loaded, the (P+E) scheduler performs wellfor both single and multihop users but the performance of real time services are highly affected under high load conditions. On the other hand, the (P+TB) scheduler has very good QoS performance for real time services under high load conditions and also has closer QoS performance to (P+E) scheduler for multihop users under low and moderate load conditions. The simulation results for CAC show that the proposed CAC have lower Call Drop Probability (CDP) for HCs than existing fixed BW reservation policy. The CAC admits more NCs when fewer number of HCs arriving at the BS. The simulation results for scheduling show that the (P+E) scheduler outperforms the (P+TB) scheduler when the system is moderately loaded and the (P+TB) scheduler outperforms the (P+E) scheduler when the system is fully loaded.

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“…While homogeneous algorithms have been proposed in [9], in [10] the authors define a hybrid uplink scheduling algorithm for the SSs that is the combination of priority-based and Earliest Due Date scheduling methods. Instead, the Earliest Deadline First scheduling algorithm is proposed in [11] for the management of uplink rtPS flows to avoid the delay violation.…”

Section: Related Workmentioning

confidence: 99%

A radio resource management framework for QoS support in multiservice WiMAX networks

Molinaro

Pizzi

2012

2012 IFIP Wireless Days

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Abstract-Among enabling technologies for the fourth generation networks, WiMAX represents a valuable solution because of its ability to provide wideband coverage and differentiated treatment to traffic with heterogeneous Quality of Service (QoS) requirements. This paper focuses on the design of a channeladaptive QoS-supporting framework for radio resource management in WiMAX networks with fixed subscriber stations. The base station generates resource grants on the basis of (i) flowbased bandwidth requests, (ii) monitored link conditions to each subscriber station, and (iii) minimum resource requirements by high-demanding flows. A compensation technique that mitigates the negative effects caused by impairments on the radio channel is also presented. The effectiveness of the proposed solution in supporting both inter-class traffic QoS differentiation and intraclass fairness is demonstrated through simulations.

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QoS Assured Uplink Scheduler for WiMAX Networks

Cited by 10 publications

References 11 publications

Comparison for Wimax Scheduling Algorithms and Proposal Quality of Service Improvement in Wimax Networks

Comparison for Wimax Scheduling Algorithms and Proposal Quality of Service Improvement in Wimax Networks

Adaptive admission control and packet scheduling schemes for QoS provisioning in multihop WiMAX networks

A radio resource management framework for QoS support in multiservice WiMAX networks

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