User Equipment Discovery Method Based on Dynamic Adjustment of Transmission Probability in D2D Communication
A technology of user equipment and transmission probability, which is applied in wireless communication, network data management, electrical components, etc., can solve the problems of reduced efficiency of user equipment discovery, failure of base stations to assist in user equipment discovery, interference, etc., to achieve good environmental adaptability and improve Discover the effect of efficiency and stable performance
Active Publication Date: 2018-09-18
SOUTHEAST UNIV
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Problems solved by technology
When the user equipment is outside the control range of the network, or the network infrastructure fails, the base station cannot assist in the discovery of the user equipment.
[0005] If the number of user equipment is much larger than the number of available resource blocks at this time, the interference situation will become extremely serious, resulting in a significant decrease in user equipment discovery efficiency
Method used
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[0096] In this example, the D2D user equipment reuses LTE uplink resources for user equipment discovery. The D2D user equipment is outside the network control range and has been synchronized. In order to compare the number of user equipment and the number of resource blocks in this method and the semi-static method Compared with the performance difference of the fixed probability method, two resource pools are selected here, the resource pool sizes are set to 20×8, 15×6, and the number of user equipment is set to 650, 450, and 250. The specific implementation steps are as follows:
[0097]Step 1: Randomly distribute user equipment in a hexagonal cell with a cell radius of 250 meters. Set the transmission power of the user equipment to a fixed 23dbm. It is found that the SINR threshold for successful signal demodulation is -6dB, and its path loss model is established. All user equipments send discovery signals with probability 1 in the initial discovery period.
[0098] Step 2...
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The invention discloses a user device discovery method based on dynamic adjustment of transmission probability in D2D (Device-to-Device) communication. User device estimates the relation between the amount of user device which transmits signals at the moment and the quantity of available resource blocks according to the detection situation of all resource blocks within each discovery period in order to adaptively and dynamically adjust the transmission probability, so that the amount of the user device which transmits the signals is equivalent to the quantity of the available resource blocks within each discovery period; the interference among the user device is lowered; and the user device discovery efficiency is increased. Through adoption of the user device discovery method, the discovery efficiency of D2D user device outside a network controllable range can be effectively increased.
Description
technical field [0001] The invention relates to a high-efficiency user equipment discovery method when the user equipment is outside the network control range in a D2D communication system. The D2D user equipment discovery is a part of the D2D communication technology and belongs to the technical field of mobile communication. Background technique [0002] Device-to-Device (D2D) communication is a new technology that allows terminals to communicate directly by reusing cell resources under the control of the system. It can increase the spectrum efficiency of the cellular communication system and solve the problem of wireless communication to a certain extent. The problem of lack of system spectrum resources. In addition, the benefits it can bring include: reducing the burden on the cellular network, reducing the battery power consumption of mobile terminals, increasing the bit rate, improving the robustness of network infrastructure failures, etc., and supporting new types of...
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IPC IPC(8): H04W8/00
CPCH04W8/005
Inventor 刘楠陈刚潘志文尤肖虎
Owner SOUTHEAST UNIV