A Quality of Service Architecture for IEEE 802.16 Standards

Alavi, Hamed; Mojdeh, M.; Yazdani, Nasser

doi:10.1109/apcc.2005.1554058

Cited by 40 publications

(13 citation statements)

References 14 publications

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“…In the 2nd round, rtPS flow is the highest priority. At first, DC[rtPS] will be the sum of Q[rtPS] and DC [rtPS] in the previous round, or 1) Update the active list to include the non-empty service queues only. The service flows in the active list will be queued by priority.…”

Section: Related Workmentioning

confidence: 99%

New Scheduling Architecture for IEEE 802.16 Wireless Metropolitan Area Network

Safa

Artail

Karam

et al. 2007

2007 IEEE/ACS International Conference on Computer Systems and Applications

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IEEE 802.16 standard defines the specifications for emerging WiMAX networks. It did not however define the scheduling algorithms that determine the uplink and downlink bandwidth allocation. This paper proposes a Preemptive Deficit Fair Priority Queue (PDFPQ) scheduling architecture for QoS management for the IEEE 802.16 standard. The proposed scheduling architecture is an extension of the DFPQ scheduling technique found in the literature. It enhances the QoS requirements of real time polling service (rtPS) flow class, and improves its delay and throughput. Compared to DFPQ, preliminary results show that a significant rtPS delay reduction and throughput increase can be realized with our new scheduling technique.

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Section: Related Workmentioning

confidence: 99%

New Scheduling Architecture for IEEE 802.16 Wireless Metropolitan Area Network

Safa

Artail

Karam

et al. 2007

2007 IEEE/ACS International Conference on Computer Systems and Applications

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“…A systematic Call Admission Control (CAC) can improve this result. Alavi et al [7] proposed a scheduling mechanism for different priority services. Cinnonetti et al [8] proposed and analyzed a QoS-based WiMAX by simulations, in which the DRR and WRR scheduling algorithms are adopted.…”

Section: Introductionmentioning

confidence: 99%

Cross-layer Based Delay-constraint Adaptive Polling for High Density Subscribers in IEEE 802.16 WiMAX Networks

Chang

Chou

2007

Wireless Pers Commun

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The IEEE 802.16 standard (namely WiMAX) is proposed to support QoS-aware transmission of real-time service in Wireless Metropolitan Area Networks (WMANs). WiMAX also can operate as a wireless backbone, and then cooperates with WiFi to form a heterogeneous wireless network. Thus, hot spots of WiFi belonging to different WiMAX networks can communicate with each other. For achieving that a Base Station (BS) serves a large number of Subscriber Stations (SSs), WiMAX uses a centralized polling access mechanism instead of a random access mechanism. WiMAX thus avoids occurring access collisions but causes long polling delay under a high-density SSs situation. Consequently, IEEE 802.16 does not schedule real-time service (rtPS) while the BS is in multicast polling mode. This problem of long polling delay becomes worse when the BS serves high-density SSs, because the BS only polls some SSs or groups in every frame time. This paper thus proposes an adaptive polling approach with a cross-layer mechanism, which dynamically polls SSs among different polling modes while continuously supporting the rtPS service. The approach consists of two phases. The first phase adopts two hysteresises of number of SSs and residual bandwidth to determine the optimal polling mode for each connection. The second phase presents a novel QoS-aware rtPS service (QrtPS) that provides an Average Delay requirement instead of the Maximum Delay requirement to take over the rtPS service when a SS is polled by the multicast mode. Additionally, a cross-layer mechanism is proposed to achieve that the real-time applications can be sent with a high-quality or low-quality video codec when the SS is in unicast or multicast mode, respectively. Numerical results demonstrate that the proposed approach significantly outperforms IEEE 802.16 in average delay and network utilization. Furthermore, the collision probabilities of using different numbers of contention slots of an uplink subframe and different numbers of groups within a BS are evaluated for the multicast mode. The results meet the experiments.

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“…Therefore, cross-layer mechanisms are designed in the proposed QoS framework, including (1) Mapping from L3 QoS to L2 QoS, (2) the admission control for QoS flow, (3) the fragmentation scheme, and (4) the remapping scheme. Some research works [5]- [9] have been proposed in the literature, in which the dynamic admission and the scheduling scheme are their major focus.…”

Section: : Introductionsmentioning

confidence: 99%

Cross-Layer QoS Framework in the IEEE 802.16 Network

Mai

Yang

Lin

2007

The 9th International Conference on Advanced Communication Technology

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To support multimedia service with the Broadband Wireless Access (BWA), the IP layer QoS is one of the keys to success. The IEEE 802.16 technology provides the wide area, high speed and non-light-of-sight wireless network. In the standard, the layer 2 technology ofthe IEEE 802.16 supports the QoS service with four service types. To improve the performance of the IEEE 802.16 network, we should consider how both the IP layer QoS and 802.16 QoS cooperate. In this paper, we propose a framework of cross-layer QoS support in the IEEE 802.16 network. Two novel mechanisms are proposed in the framework for performance improvement. Fragment Control and Remapping. Fragment Control handles the data frames that belong to the same IP datagram in an atomic manner to reduce useless transmission. Remapping is concerning about the mapping rules from IP QoS to 802.16 QoS and is designed to reduce the impact of traffic burstiness on buffer management. Simulation study has shown that the proposed scheme has higher goodput and throughput than the contrast.

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A Quality of Service Architecture for IEEE 802.16 Standards

Cited by 40 publications

References 14 publications

New Scheduling Architecture for IEEE 802.16 Wireless Metropolitan Area Network

New Scheduling Architecture for IEEE 802.16 Wireless Metropolitan Area Network

Cross-layer Based Delay-constraint Adaptive Polling for High Density Subscribers in IEEE 802.16 WiMAX Networks

Cross-Layer QoS Framework in the IEEE 802.16 Network

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