System Performance Evaluation Of MBMS (Multimedia Broadcast And Multicast Service) In LTE

Thanks to the rapid development of wireless communication technique, we can now have a picture of the near future with full of attractive and high-speed data service, such as multimedia message, on-line video, music download, mobile TV etc. To meet the need of this kind of new services, 3GPP build a Long Term Evolution plan (LTE) for UMTS, which is also known as Evolved UTRA and Evolved UTRAN.In this paper, we focused on the MBMS (Evolved Multimedia Broadcast and Multicast Service) in E-UTRAN. With the system level simulation we mainly analyzed the performance of E-MBMS and investigated several key technical points.A system simulator was built based on OFDMA according to 3GPP specifications TS22.146, 22.246, 22.346, TR25.813, 25.814. The simulator comprises of cell layout, large scale and small scale fading, AMC, HARQ and scheduling, etc. Within the mostly concerned technical issues for MBMS, we mainly focused on the following points: the spectrum efficiency for PtP, PtM, and SFN in full-buffer and fixed-bit-rate mode; the resource allocation schemes and scheduling algorithm for PtP in fixed-bit-rate mode; different schemes of HARQ and AMC in PtM; diversity gain from the STTD.Results show that from the view of the general spectrum efficiency per UE, SFN completely outperforms PtM and PtP, while PtM is better than PtP when there are more users. There is little gain from PF scheduling for PtP in fix-bit-rate mode. The spectral efficiency per UE of PtM with feedback decreases when the UE number increases and it converges to that of PtM no feedback. STTD provides a little gain on BLER with PF scheduling.