Abstract
The efficiency of high speed packet access (HSPA) systems is mainly based on channel quality information (CQI) reports transmitted by user equipment (UE) to Node B. In this paper, we propose an improved CQI prediction scheme based on a finite state Markov chain (FSMC) model for wireless channel, in order to reduce CQI signaling overhead in the HSPA system. Then, we introduce an enhanced uplink packet scheduling (EUPS) scheme to provide quality of services (QoS) guaranteed for continuous packet connectivity in the enhanced uplink (EUL). EUPS serves the active UEs not only according to buffer status but also according to reported state of the wireless channel of each UE. The performance of the proposed scheme in terms of average packet delay, average packet drop and average cell throughput is compared to the classical scheduler of 3GPP standards. The simulation results show the effectiveness of the proposed scheme.
Highlights
Nowadays, high speed packet access (HSPA) is the best communication system to provide different services with quality of services (QoS) guaranteed to user equipment (UE) at any time, any place, and supporting full mobility in a cost-effective and efficient manner
The efficiency of high speed packet access (HSPA) systems is mainly based on channel quality information (CQI) reports transmitted by user equipment (UE) to Node B
We propose an improved CQI prediction scheme based on a finite state Markov chain (FSMC) model for wireless channel, in order to reduce CQI signaling overhead in the HSPA system
Summary
HSPA is the best communication system to provide different services with QoS guaranteed to UEs at any time, any place, and supporting full mobility in a cost-effective and efficient manner. The scheduling procedure in HSPA systems is based on a set of rules that contains signalling control information in the downlink and uplink between Node B and UEs. The high speed downlink packet access (HSDPA) scheduling is mainly based CQI reports that are transmitted from UEs to Node B, in order to achieve high system efficiency. According to 3GPP standards, the HSUPA scheduler at Node B is mainly based on the scheduling information (SI) that contains logical information, related to the power transmission and buffered data of UEs. As a result, the scheduling procedure for multimedia applications packet data does not quite guarantee the delay requirements of different services. Our goal in this work is to improve the performance efficiency of HSPA systems, we propose an improved CQI reporting scheme to minimize the signalling overhead and increase the uplink reception quality.
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