Comparative Study of the IEEE 802.16 Random Access Mechanisms

Staehle, Dirk; Pries, Rastin

doi:10.1109/ngmast.2007.4343442

Cited by 14 publications

(8 citation statements)

References 6 publications

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“…However, one problem of the advanced scheduling services (UGS and rtPS) is that a good knowledge of the traffic characteristics (e.g., packet arrival interval and packet size) is required to provide satisfactory QoS and efficiently utilize bandwidth [6]. Since the traffic characteristics of many applications are not known in advance, the traffic will be transported via nrtPS or BE scheduling services.…”

Section: Introductionmentioning

confidence: 99%

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Service Differentiation for the Bandwidth Request Scheme in Fixed IEEE 802.16 Networks

Chen

et al. 2008

2008 4th IEEE International Conference on Circuits and Systems for Communications

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IEEE 802.16 standards have been developed as one of the technical solutions for broadband wireless access systems. It has high data rate, large network coverage, flexible QoS schemes and cheap network deployment. Various flexible mechanisms related to QoS provisioning have been specified for uplink traffic at the medium access control (MAC) layer in the standards. Among the mechanisms, contention based bandwidth request scheme can be used to indicate bandwidth demands to the base station for the non-real-time polling and besteffort services. These two services are used for most application with unknown traffic characteristics. Due to the diverse QoS requirements of those applications, service differentiation (SD) is anticipated over the contention based bandwidth request scheme. In this paper we investigate the SD with the bandwidth request scheme by means of assigning different channel access parameters and bandwidth allocation priorities. The effectiveness of the differentiation schemes are evaluated by simulations. It is observed that the initial backoff window can be efficient in SD, and if combined with the bandwidth allocation priority, the SD performances will be better.

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Section: Introductionmentioning

confidence: 99%

“…Random access and polling mechanisms for WiMAX networks are compared in [5]. The OFDM and OFDMA based random access schemes are compared by simulation in [6].…”

Section: Introductionmentioning

confidence: 99%

Service Differentiation for the Bandwidth Request Scheme in Fixed IEEE 802.16 Networks

Chen

et al. 2008

2008 4th IEEE International Conference on Circuits and Systems for Communications

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“…Most of recent studies [2]- [6] of random access in IEEE 802.16 are focusing on the collision probability and reducing the collision probability using either CDMA-based random access or message-based random access. In [2], the random access schemes and those characteristics have been studied focusing on collision probabilities and access delays.…”

Section: Introductionmentioning

confidence: 99%

“…In [2], the random access schemes and those characteristics have been studied focusing on collision probabilities and access delays. In [6], random access of bandwidth request which is a subset operation of one of bandwidth request procedures has been studied.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of random access in IEEE 802.16m system

Lee

Kim

et al. 2010

2010 International Conference on Information and Communication Technology Convergence (ICTC)

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IEEE 802.16m, also known as the WirelessMAN-Advanced air interface, system adopts a random access using CDMA (Code Division Multiple Access)-based random access and message-based random access. The message-based random access is intended to reduce access delay when random access load is low. However, CDMA-based random access is used as random access load increases due to failure of message-based random access. In this paper, we analyze the performance of the enhanced random access in the IEEE 802.16m system which supports message-based random access in addition to CDMAbased random access. The analysis and numerical results help understand the performance of random access in IEEE 802.16m with low delay and low collision probability. WirelessMAN-Advanced; CDMA-based Random Access; Message-based Random Access; IEEE 802.16m; Wireless MANsI.

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“…However, the authors assumed that the procedure is initiated via a sending a Code Division Multiple Access (CDMA) code, which is not available for all physical layers specified by the standard. The use of CDMA for contention-based bandwidth request is also investigated in [13], where the authors show via simulation that this technique yields better performance than the mandatory mechanism, at least under the considered scenarios. However, since the use of CDMA codes is optional and is only available with mobile terminals, we do not consider it here.…”

Section: Introductionmentioning

confidence: 99%

A bandwidth request reiteration mechanism for IEEE 802.16 wireless networks

2009

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The IEEE 802.16 is a leading technology for Broadband Wireless Access (BWA), where a Base Station (BS) provides a set of Subscriber Stations (SSs) with first-mile network access. Each SS has multiple connections directed to the BS, which are assigned bandwidth on a demand basis. Specifically, the BS allocates part of the channel as request slots, which are accessed by best-effort connections in a random access manner to transmit bandwidth requests. Although bandwidth requests sent by different SSs may collide the standard does not specify an explicit acknowledgment mechanism. This, and the bandwidth being assigned by the BS to each SS as a whole, may lead to critical inconsistencies between the perception of the SSs’ requirements at the BS and the actual SSs’ requirements, which in turn may entail SS service disruption. While the standard suggests that an SS should regularly update the BS about the backlog of its connections, the algorithm to do so is left unspecified. In this paper we propose a simple, yet effective, mechanism to be employed by the SSs, called Bandwidth Request Reiteration (BR2), which prevents deadlock from occurring. Using detailed packet-level simulation, we compare BR2 to an alternative approach based on timeout, and show that BR2 achieves better performance, in terms of the average transfer delay, while it does not incur a significant additional overhead, in terms of MAC signalin

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Comparative Study of the IEEE 802.16 Random Access Mechanisms

Cited by 14 publications

References 6 publications

Service Differentiation for the Bandwidth Request Scheme in Fixed IEEE 802.16 Networks

Service Differentiation for the Bandwidth Request Scheme in Fixed IEEE 802.16 Networks

Performance analysis of random access in IEEE 802.16m system

A bandwidth request reiteration mechanism for IEEE 802.16 wireless networks

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