Investigation on IEEE 802. 16m Networks under Developed Error Model
نویسندگان
چکیده
Contention based bandwidth request mechanism is suggested for best effort services in WiMAX networks. The design of contention mechanism depends on the error model that reflects the transmission failure. In this paper, we have developed an error model by integrating the collisions due to contention, unavailability of bandwidth and channel error. The conventional exponential increase and exponential decrease (EIED) backoff witnessed low contention efficiency and high access delay with the proposed error model. Hence, we modify the EIED scheme by computing the backoff factors with average contention window and estimating the response time to reduce the waiting time of stations. The performance of WiMAX network is studied with varying number of stations, error rates and the number of slots allocated for bandwidth request. The effectiveness of the developed model is validated by means of simulation results.
منابع مشابه
ZigBee: Simulation and Investigation of Star and Mesh Topology by Varying Channel Sensing Duration
ZigBee was developed by IEEE 802. 15. 4 Task Group and ZigBee Alliance. ZigBee (IEEE 802. 15. 4?2006 standard) is a category in the IEEE 802 family and ZigBee alliance is responsible for ZigBee standard which uses the transported services of the 802. 15. 4 network specification therefore ZigBee is a specification for a suite of high level communication protocols using small, low-power digital r...
متن کاملPerformance Improvement of IEEE 802. 11a Receivers Using DFT based Channel Estimator with LS Channel Estimator
In this paper the performance of one of the most widely deployed Wireless Local Area Networks (WLANs) based on IEEE 802. 11a standard has been analyzed using different modulation technique and convolution coding rates. The IEEE 802. 11a standard uses Orthogonal Frequency Division Multiplexing (OFDM) technique. In this analysis the channel estimation is pilot symbol based. A particular method pr...
متن کاملArticle: IEEE Standardization for the Wireless Engineer
This article explains the process of standardization in the IEEE Standards Association.It emphasizes topics relevant to the wireless engineer,particularly the IEEE 802 LAN MAN Standards Committee and its three projects defining a Wireless Internet infrastructure. This article was published as “IEEE Standardization for the Wireless Engineer, Roger B. Marks, IEEE Microwave Magazine 2, pp. 16-26, ...
متن کاملDraft Mick Seaman
This document describes the support of IETF Integrated Services over LANs built from IEEE 802 network segments which may be interconnected by IEEE 802.1 MAC Bridges (switches) [1]. It describes the practical capabilities and limitations of this technology for supporting Controlled Load [8] and Guaranteed Service [9] using the inherent capabilities of the relevant 802 technologies [5],[6],[15],[...
متن کاملReal-Time H.263+ Video Transmission on 802.11 Wireless LANs
Wireless video services in packet-switched environments constitute a significant challenge. While rudio chantiels present limited capacity, high error rates arid time-vaying and asymmetric propagation properties, video applications are batid~vidth-killing, error-sensitive and delay-intolerant. This situation forces wireless video system to dymnical l j adapt to changes in the network resources....
متن کامل