Abstract
Long Term Evolution (LTE) and beyond networks offer high bitrates with low latencies which makes them the best choice to handle the growing demand on multicast mobile services such as video streaming, and news broadcasting. In Conventional Multicast Scheme (CMS), the gain of multicast is exploited by transmitting data to all users simultaneously using the rate of Worst Channel Gain (WCG), which wastes network resources. In this paper, to better balance the tradeoff between the multicast gain and multiuser diversity, we propose a mechanism to select a threshold to split users into two subgroups and exploits the Opportunistic Multicast Scheme (OMS) to transmit the data. Simulation results show that the proposed mechanism improves the multicast performance in terms of increased throughput, decreased delay and Packet Loss Ratio (PLR) compared to existing mechanisms from the literature.DOI: http://dx.doi.org/10.5755/j01.eie.24.5.21850
Highlights
Long Term Evolution (LTE) network was introduced by the Third-Generation Partnership Project (3GPP) and considered as the latest step towards the 4th generation of radio technologies [1]
LTE network exploits the benefits of Orthogonal Frequency Division Multiple Access (OFDMA), in which the transmitted data is multiplexed in frequency and time domains [1]
In such case; where few users located at the cell edge while the remaining users located close to the Evolved NodeB (eNodeB), selecting the modulation and coding scheme (MCS) corresponding to the Worst Channel Gain (WCG), as proposed in previous works such as [27], [30], [31], wastes the bandwidth and degrades the E-MBMS performance
Summary
Long Term Evolution (LTE) network was introduced by the Third-Generation Partnership Project (3GPP) and considered as the latest step towards the 4th generation of radio technologies [1]. Each user sends its Channel Quality Indicator (CQI) feed- back to its base station which is called Evolved NodeB (eNodeB), in turn the eNodeB dynamically adjusts for that user the modulation type and code rate; combined together called the modulation and coding scheme (MCS) This improves the network resource utilization and increase the spectral efficiency (SE). There are several mechanisms which have been proposed such as Average, Median, and maximum throughput (MT) By using these mechanisms, some users may fail to decode the transmitted data. In each TTI, the D-OMS mechanism selects a portion of users that can increase the multicast throughput compared to the Median mechanism. A novel MCS selection mechanism to select a threshold that can be used with the OMS strategy to enhance the multicast performance is proposed.
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