Vadim Sergeyev

Analysis of IEEE 802.16m and 3GPP LTE Release 10 technologies by Russian Evaluation Group for IMT-Advanced

The IMT-Advanced standardization process is executed by International Telecommunications Union Radiocommunication Sector (ITU-R) to define requirements to the next 4-th generation mobile communication systems and certify technologies meeting these requirements. This work presents results of the IEEE 802.16m and 3GPP LTE Release 10 technologies evaluation obtained by the Russian Evaluation Group (REG) as part of the ITU-R IMT-Advanced standardization process. The evaluation was done mainly by system level simulations and considered four mandatory test environments of IMT-Advanced: indoor, microcellular, base coverage urban and high speed. Cell spectral efficiency and cell-edge user spectral efficiency were evaluated for downlink and uplink transmissions. It was found out that performance of both IEEE and 3GPP technologies meets the IMT-Advanced requirements for all the considered evaluation scenarios. This conclusion was conveyed by the REG to ITU in the evaluation report submitted in June 2010.

Backhaul network based on WiMAX with relays - system level performance analysis

In this paper we present the system level performance analysis of the backhaul network based on WiMAX (IEEE 802.16-2004, 2004) with relays. The considered wireless communication system has hexagonal cellular structure, each cell containing a central base station (BS), one or more associated relay stations (RS), all serving the plurality of subscriber stations (SS). The base stations and the relay stations may share the same time-frequency resources when serving subscribers in accordance with various relaying modes having different reuse factor and leading to different level of interference in the deployment. The performance analysis of different relaying modes is presented in this paper. The methodology of individual mode assignment for each subscriber and frame composition is presented along with the analysis of geographical distributions of subscriberspsila preferable relaying modes. Finally, the total cell throughput is evaluated for the case of optimal subscriberspsila assignment to different relaying modes. We show that suggested adaptive relaying technique gives significant increase in the total cell throughput and spectral efficiency.