In parallel, Public Safety PS communication systems are changing due to emergence of Long Term Evolution LTE as a mature solution to replace the legacy ones while providing new services. Because the target load varies from one network to another, the network interference level under different loads, as shown in Fig.
From these analyses, optimal uplink bandwidth configuration can be obtained for different service rates, and good coverage can be achieved. Specifically, we investigate the coordination and orchestration functionality within the proposed architecture and propose a cross layer hierarchical resource scheduling algorithm in order to efficiently meet Quality of Service QoS requirements for real-time traffic while maximizing the throughput for elastic flows. However, LTE is initially designed for commercial cellular network and need to be further evolved to tackle the substantial requirements of PS use cases.
In system-level research, system simulations are performed to determine how received signal strength, interference density, interference margin, and CIR change with the application scenario and coverage range. Once the GF reference value is obtained, a definite mathematical relationship between the GF and SINR can be established for downlink coverage analysis. Underlining the limitations of such systems, we detail the challenges faced by a LTE solution that would answer these requirements. In LTE uplink coverage design, interference margin is critical for network planning. Different combinations of these parameter settings bring about different network coverages and capacities.
We then evaluate the efficiency and adaptability of our proposed resource scheduling algorithm in various network topologies and heterogeneous traffic flows with QoS requirements. It is therefore necessary to work out the GF reference values for different loads.
With the above system- and link-level analyses, the two core elements for uplink budget can be determined: interference margin and uplink transmission bandwidth the corresponding modulation and coding scheme MCS and signal to interference plus noise ratio SINR should be worked out with link simulation. On the whole, research on LTE networking is still exploratory.
References  S. In this way, existing coverage planning methods can be improved. Simulation under conditions of same frequency networking and full load shows the GF is 3 dB, as shown in Fig. Underlining the limitations of such systems, we detail the challenges faced by a LTE solution that would answer these requirements. However, LTE is initially designed for commercial cellular network and need to be further evolved to tackle the substantial requirements of PS use cases.
To work out a network planning scheme for a specific scenario, it is necessary to analyze the settings of the parameters in various application scenarios in order to find out which settings meet the requirements. Then, the maximum allowed path loss MAPL of the uplink at a given edge rate can be calculated based on traditional link budget and calculation methods. Analysis of a large number of systems shows the geometry factor GF , with its unique characteristics, is an ideal bridge for downlink budget. To demonstrate the feasibility and reliability of our proposed architecture, we implement the corresponding self-backhauling air interface based on Open Air Interface platform and compare with the legacy LTE air-interface. For LTE systems, the direct measurement for uplink interference features is average interference over thermal IoT level.
By studying channel capacity and analyzing link-level simulation results it can be seen that optimizing bandwidth configuration at a given data rate enhances coverage.
In uplink coverage design, the following should be taken into consideration and analyzed: link performance in link simulations and actual system tests, power efficiency of the terminals, and system performance at given data rates and with different user bandwidth allocations. For LTE systems, the direct measurement for uplink interference features is average interference over thermal IoT level. Thus, it lays the basic foundations for LTE network design.
The simulation results are then used as the basis for coverage planning. Finally, we summarize the remaining uncertainties concerning real-field deployments and we conclude this study. The formulae for these calculations are as follows:. In parallel, Public Safety PS communication systems are changing due to emergence of Long Term Evolution LTE as a mature solution to replace the legacy ones while providing new services.