Research On Geometric Programming Based Radio Resource Allocation In High-Speed Mobile Environment

In order to meet the requirement of Long Term Evolution-Advanced (LTE-A) on bandwidth, peak data rates, user average throughput and frequency efficiency. Carrier Aggregation. Enhanced Uplink (UL)/Downlink (I)L) Multiple Input Multiple Output (MIMO). Coordinated Multi-Points transmission and reception. Relay Enhanced Inter-Cell Interference Coordination (eICIC) for Heterogenous Networks and some other key technologies are used in LTE-A system. Among these, wireless relay is proposed to solve the problem of expanding the coverage of the cell, and improving the cell edge throughput. It has become one of the hot topics.On the other hand, more and more people choose to take the high-speed train for travelling. People look forward to the use of advanced communication technology for reliable data transmission in the high-speed mobile environment.not only on train control, but also on passengers’ communication. However, at present the existing high-speed railway wireless communication system is facing many issues such as the large and rapidly changing Doppler frequency shift, the short coherence time of the radio channel impulse response, the penetration loss caused by the high-speed train’s closed trucks and so on. Because of problems above, the wireless system cannot provide the fast and reliable communication service for passengers.Therefore, in this paper we combine the actual situation of the high-speed railway scenarios and the application of the wireless relay technology. We study in depth to solve the radio relay system resource allocation algorithm for the high-speed mobile scenario by using geometric programming. We propose our multi-cell system model in this paper, and make interference analysis between cells. Most important of all, we take the time delay constraint into consideration. Several algorithms based on geometric programming are proposed. Simulation results show that the proposed algorithms have excellent performance to improve the overall system throughput.