Dynamic Resource Allocation based on D2D Channel Quality over LTE Networks

• Main Authors: TSAI, WEI-HSUAN, 蔡惟軒
• Other Authors: Fang-Chang Kuo
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/t42fdr

碩士 === 國立宜蘭大學 === 電子工程學系碩士班 === 105 === D2D (Device to Device) communication is able to reduce the eNB load effectively, improve the system shunt one of the 5G key technology. If more D2D pairs using the same RB for data transmission, it can further enhance the system reuse RB (Resource Block) rate. In the case where the same RBs interfere with each other, if they are still able to communicate, they can become the same clique and share RBs with each other. Doubling the way to let D2D pairs share RB, can further enhance the system RB reuse rate. In the past, many scholars proposed RB reuse method. Which is proposed by Shih’s D2D method is relatively complete. However, after the actual research simulation found that there are some problems with this method. The problem is as follows: 1. The interference calculation model between two D2D pairs is imprecise. 2. Can not accurately calculate the channel quality between devices in D2D pair. 3. Do not consider the total amount of interference in a clique. 4. D2D pair can not declare the number of RBs required. Therefore, this paper presents a program to establish the connection transmission, in order to measure the D2D pair signal strength. The SINR of the D2D pair is calculated as the standard for the actual measurement of the signal strength. In the process of the clique, need to pass SINR interference confirmation filter. Finally, Required RB is allocated according to the actually required data rate. After the actual simulation of the design process, but also encountered some problems, the problem is as follows: 1. Two pairs of Pair channel quality, how to calculate. 2. Before and after the clique, RB reuse rate is not improved. 3. Using a different RB for the UE, there is a different channel quality. In order to solve these problems, the paper puts forward the selection of RB gap, and the channel quality between the pair is directly used to solve these problems by using path loss, adjustment mechanism of clique and modulation method. According to the results, the improvement scheme of the subordinate group based on the actual D2D channel quality and resource adjustment is not only highly feasible and accurate compared with other schemes. The simulation results also show that there is a good RB reuse rate, The entire system of RB savings reached an average of 58.7%.