Distributed mechanisms for quality of service in wireless LANs

Pattara-Atikom, Wasan; Krishnamurthy, P.; Banerjee, Sujata

doi:10.1109/mwc.2003.1209593

Cited by 144 publications

(61 citation statements)

References 15 publications

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“…One strategy that could be deployed is to specify different contention windows for different devices based on a negotiation with the RA. While this is similar to some of the QoS approaches in WiFi [17], the devices that employ QoS do so on their own, without any coordination with an RA. Thus, the resulting behavior may fail to be as desired.…”

Section: B Case Ii: Ieee 80211 Protocol Tweaksmentioning

confidence: 81%

How Can Polycentric Governance of Spectrum Work?

2016

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Abstract-Spectrum policy in the US (and throughout most of the world) consists generally of a set of nationally determined policies that apply uniformly to all localities. However, it is also true that there is considerable variation in the features (e.g., traffic demand or population density), requirements and constraints of spectrum use on a local basis. Global spectrum policies designed to resolve a situation in New York City could well be overly restrictive for communities in rural areas (such as central Wyoming). At the same time, it is necessary to ensure that more permissive policies of central Wyoming would not create problems for NYC (by ensuring, for example, that relocated radios adapt to local policies). Notions of polycentric governance that have been articulated by the late E. Ostrom [16] argue that greater good can be achieved by allowing for local autonomy in resource allocation.Shared access to spectrum is generally mediated through one of several technologies. As shown in [21], approaches mediated by geolocation databases are the most cost effective in today's technology. In the database oriented Spectrum Access System, or SAS, proposed by the FCC, users are granted (renewable) usage rights based on their location for a limited period of time. Because this system grants usage rights on a case-bycase basis, it may also allow for greater local autonomy while still maintaining global coordination. For example, it would be technically feasible for the database to include parameters such as transmit power, protocol, and bandwidth. Thus, they may provide the platform by which polycentric governance might come to spectrum management. In this paper, we explore, through some case examples, what polycentric governance of spectrum might look like and how this could be implemented in a database-driven spectrum management system. In many ways this paper is a complement to [20], which evaluted emerging SAS architectures using Ostrom's socioeconomic theory. This paper explores how a SAS-based system could be constructed that is consistent with Ostrom's polycentric governance ideas. Our approach is to address spectrum management as an emergent phenomenon rather than a top down system. This paper will describe the key details of this system and present some initial modeling results in comparison with the traditional global model of spectrum regulation. It will also discuss some of the concerns associated with this approach.

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Section: B Case Ii: Ieee 80211 Protocol Tweaksmentioning

confidence: 81%

How Can Polycentric Governance of Spectrum Work?

2016

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“…This is usually achieved by adapting the contention window and/or the initial back-off of the CSMA/CA mechanism. Overviews of these approaches are presented in [5] and [6]. Rate and admission control [7], [8], [9] may be used with contentionbased protocols to handle congestion.…”

Section: Related Workmentioning

confidence: 99%

Real-Time Query Scheduling for Wireless Sensor Networks

Chipara

Roman

2007

28th IEEE International Real-Time Systems Symposium (RTSS 2007)

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Abstract-Recent years have seen the emergence of wireless cyber-physical systems that must support real-time queries of physical environments through wireless sensor networks. This paper proposes Real-Time Query Scheduling (RTQS), a novel approach to conflict-free transmission scheduling for real-time queries in wireless sensor networks. First, we show that there is an inherent trade-off between latency and real-time capacity in query scheduling. We then present three new real-time schedulers. The non-preemptive query scheduler supports high real-time capacity but cannot provide low response times to high priority queries due to priority inversions. The preemptive query scheduler eliminates priority inversions at the cost of reduced capacity. The slack stealing query scheduler combines the benefits of the preemptive and non-preemptive schedulers to improve the capacity while meeting query deadlines. We provide schedulability analysis for each scheduler. The analysis and advantages of our approach are validated through NS2 simulations.

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“…Therefore, in order to support QoS for real-time traffic on WLANs, these issues need to be resolved. Various research proposals [3,6,7,8] address to solve these issues, and attempt to support QoS in IEEE 802.11 based WLANs. IEEE 802.11e standard [3] defines Enhanced Distributed Channel Access (EDCA) mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Hence the implementation is not economical. Schemes proposed in [6,7,8] suggest either assigning priority to incoming real-time and non real-time traffic or service differentiation using multiple queues and hence cannot support the QoS requirements of voice traffic.…”

Section: Introductionmentioning

confidence: 99%

SmartCAC: Call Admission Control scheme to guarantee QoS for Voice over IEEE 802.11 WLANs

Shete¹,

Awale²

2012

IJCA

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Most of the wireless LANs deployed today are IEEE 802.11b/g compliant. Since IEEE 802.11 standard specifies a contention based MAC-DCF, it cannot support QoS requirements of real-time traffic like voice or video. Thus these WLANs are not suitable for supporting real-time voice traffic. In this paper we propose an admission control scheme "SmartCAC", which without modifying the basic access mechanism of IEEE 802.11 tries to guarantee QoS for voice traffic. SmartCAC is a channel BW allocation scheme; in which most of the available BW is reserved for real-time voice traffic and remaining small amount is allocated to non real-time data traffic. Moreover, the BW allocation is not static; rather it can be dynamically changed depending on traffic conditions. If the voice traffic is lightly loaded then rather than wasting the greater BW share allocated to voice, it is made available for non real-time traffic sources momentarily. Our ns-2 simulations result show that the proposed SmartCAC scheme can support strict QoS requirements such as high throughput and low delay (<150ms) required for voice over IP.

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Distributed mechanisms for quality of service in wireless LANs

Cited by 144 publications

References 15 publications

How Can Polycentric Governance of Spectrum Work?

How Can Polycentric Governance of Spectrum Work?

Real-Time Query Scheduling for Wireless Sensor Networks

SmartCAC: Call Admission Control scheme to guarantee QoS for Voice over IEEE 802.11 WLANs

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