Packet scheduler plays the central role in determining the overall performance of the 3GPP long-term evolution (LTE) based on packet-switching operation. In this paper, a novel minimum transmit power-based (MP) packet-scheduling algorithm is proposed that can achieve power-efficient transmission to the UEs while providing both system throughput gain and fairness improvement. The proposed algorithm is based on a new scheduling metric focusing on the ratio of the transmit power per bit and allocates the physical resource block (PRB) to the UE that requires the least ratio of the transmit power per bit. Through computer simulation, the performance of the proposed MP packet-scheduling algorithm is compared with the conventional packet-scheduling algorithms by two primary criteria: fairness and throughput. The simulation results show that the proposed algorithm outperforms the conventional algorithms in terms of the fairness and throughput.
The evolved multimedia broadcast multicast services (E-MBMS) can bring television (TV) services to a small mobile phone. The E-MBMS has been proposed in the third generation partnership project long-term evolution standardisation to support both normal mobile phone and mobile TV capabilities on a single device. As the E-MBMS delivers the same content simultaneously to multiple E-MBMS users sharing the same subframe in the multicast broadcast single frequency network (MBSFN) area and has the benefit of short handover latency when handover occurs within the MBSFN area; it is important to increase the number of E-MBMS users to be supported within the MBSFN area in order to achieve better performance in terms of spectral efficiency and handover latency. To obtain the advantages mentioned above, the proposed adaptive handover scheme increases the handover hysteresis margin (HM) when an E-MBMS user moves from the serving MBSFN area to the target non-MBSFN area and decreases the handover HM when an E-MBMS user travels from the serving non-MBSFN area to the target MBSFN area. Simulation results show that the spectral efficiency can be improved by increasing the number of E-MBMS users in the MBSFN area. Also, it is shown that the lower handover latency can be achieved by reducing the additional handover signalling message exchanges.
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