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This paper investigates throughput and round-trip time modelling for TCP/IP operating over an HSDPA based UMTS network. Analytical models for TCP/IP's throughput, hybrid automatic repeat request and round-trip time, in droptail and RED router based environments, have been described. This analysis has been supported by NS-2 based simulations to obtain throughput and round-trip time for a wired-cum-wireless...
In this paper we evaluate the performance of downlink channel dependent scheduling in time and frequency domains. The investigation is based on the 3GPP UTRAN long term evolution (LTE) parameters. A scheduler framework is developed encompassing frequency domain packet scheduling, HARQ management and inter-user fairness control. It is shown that by dividing the packet scheduler into a time-domain and...
High speed downlink packet access (HSDPA) is the major evolution of UMTS downlink. It provides peak data rates up to 10.8 Mbps. This is reached by radio link adaptivity, which includes fast scheduling, adaptive modulation and coding (AMC), and hybrid automatic repeat request (HARQ). The performance of AMC suffers from multipath interference introduced by the channel especially when using 16-QAM modulation...
The enhanced uplink (E-UL) will be ready for deployment in the very near future. Consequently, the demand of know-how on efficient resource assignment and scheduling strategies on system/network level currently strongly arises from network operators. Beside a fast retransmission mechanism (hybrid ARQ HARQ), the second key advantage of the E-UL compared with the release 99 version is the Node B resource...
Recently, many channel-dependent scheduling schemes for high speed downlink packet access (HSDPA) system have been introduced to provide high system throughput and quality-of-service (QoS) guarantee. However, no work has considered hybrid automatic repeat request (HARQ), one of special features of Universal Mobile Telecommunications System (UMTS) Release 5 network. In this paper, a new packet scheduling...
OFDMA system with frequency re-use of 1 suffers from poor cell edge performance because of serious inter-cell interference in both downlink and uplink. In this paper, a novel method called scheduling based controllable interference coordination (SBCIC) which adapts to different system load distribution and its variation is proposed to mitigate inter-cell interference and hence increases SIR at cell...
In this paper, a hybrid resource management system for the uplink in Universal Mobile Telecommunications System wideband code-division multiple access (WCDMA) with components in the Node-B and user equipment (UE) has been proposed. A rate scheduler in the client focuses on average packet delays as a means of abstracting application-specific requirements from the rest of the resource management scheme...
UMTS, as a third generation mobile communications system, has been developed to offer, in addition to traditional basic services - such as voice telephony, broader data connections and multimedia services. Channel reliability, the most common problem affecting mobile communications, strongly influences such new services and, in particular, the quality of multimedia streams. Nevertheless, current solutions...
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