Research On Dynamic Uplink Resource Allocation And Cell Interrupt Compensation Method Based On LTE - A System

The development of wireless communication is always pursuing Communications technology and the rapid development of multimedia services, expansion of wireless networks, and a variety of technical standard coexistence which make the modern mobile communication networks become increasingly complex. Next-generation wireless networks based on the MIMO, OFDM, carrier aggregation and other physical layer technology provides users with a richer diversity of business, on account of Its broadband, high-speed and high spectrum utilization characteristics, Relay deployment, heterogeneous cellular network architecture complemented by Pico、Femto, making the network architecture complexity, ubiquitous, isomerization, and network flexibility, intelligence requirements are more prominent.In recent years, the biggest challenge facing mobile operators and their technology suppliers is in satisfying exponential growth in data traffic. On one hand, asymmetric wireless multimedia services, such as real time streaming and web browsers, become even popular, where downlink and uplink traffic loads are uneven. On the other hand, in a mobile cellular network operation process, because of hardware and software failures, a sudden power outage, disaster and other unexpected situations can result in a sudden failure of the base station. This will bring great damage to the quality of service (QoS) of network. Therefore, low-cost fault detection and repair program are important methods to protect the network reliability and stability. As a result, cell outage detection and compensation because hot topics.In this paper, a dynamic TDD technology which allows flexible D/U ratio (downlink rate requirements to uplink rate requirements) adaptation with frame design is given in the small cell Networks. We propose an Adaptive D/U Ratio (ADUR) algorithm that small cell eNBs dynamically decide frame type on their own, in accordance with their user’s D/U requirements, while mitigating the crossed-timeslot interference (CTI) for the inter-cell. On the other hand, in order to solve the issue of cell outage compensation, we propose a Cooperative cell outage compensation scheme based on CoMP in heterogeneous network. Compared to the traditional heterogeneous network outage compensation scheme, we add neighboring macro base station of outage cell into coordinated cluster in order to strengthen the compensation effect. The problem is modeled as a coalitional game, we guarantee the QoS of UE through an optimal cluster options, while reduce the overall energy consumption of the network. Simulation results show that the proposed ADUR scheme not only achieves a fair and efficient throughput distribution among UEs, but also reduces the CTI in the network which can improve the system capacity effectively. At the same time, our CoMP compensation scheme not only compensate for the outage users effectively but also reduce the network energy consumption when the cell outage.