A method for discovering autonomous devices in a d2d communication system

Abstract

The invention discloses an autonomous equipment discovering method in a D2D (Dimension To Dimension) communication system. The discovering resources comprise a uniformly-spaced time slot resource and a uniformly-spaced single frequency resource, and the time slot resource appears periodically. The method comprises the following steps: setting the time slot resource period as the preset value T0, and informing UE (Unified Equipment) the discovered used total resource position; determining the sending used resource according to the principle of selecting time slot first and then selecting frequency by the equipment, and selecting according to the greedy manner by the frequency resource; sending periodic automatic switching, and setting the preset value N1, prolonging the period when the UE fails to send in continuous N1 periods, and corresponding shortening the period when the UE succeed in sending in continuous N1 periods; receiving discovering signals sent by other UE on other resources by the UE. The method can reduce the problems of disturbance, collision and speed in the discovering process, and improves the utilization ratio of the resource.

Description

technical field [0001] The present invention relates to the field of network technologies, in particular to a method for discovering autonomous devices in a D2D communication system. Background technique [0002] In the future, IMT-Advanced will provide bandwidth up to 100MHz to achieve high-speed transmission. In order to meet the requirements of IMT-A, many new wireless access technologies have been proposed. Among them, device-to-device (D2D) has attracted more and more attention as a promising technology. D2D communication is a technology that allows terminals to communicate directly under the control of the base station. It can increase the spectral efficiency of the cellular communication system, reduce the terminal transmission power, reduce the load of the cell base station, and reduce battery consumption. To a certain extent Solve the problem of lack of spectrum resources in wireless communication systems. [0003] With the popularity of applications such as soci...

AI Technical Summary

Problems solved by technology

[0014] (3) Problems caused by FDM-based design

At the same time, this way of jumping also solves the problem of sensitivity

[0018] 2. Defects in FlashLinQ

[0023] (2) During the device discovery process of FlashLinQ, the device scans all the discovery resources within the first 8s of the discovery stage, and detects interference to determine the PDRID that can be used in the next cycle. Therefore, when the device is in a low-speed mobile state At this time, the change of the location of the device after 8s will bring about the change of the topology of the wireless network. At this time, if the frequency resources detected before 8s are still used, collisions and interference may occur

This need to monitor the energy on all resource blocks consumes a lot of time and power

[0025] (4) For a device newly added to the network, it is necessary to perform a cycle of energy detection first, and wait until the start of a new discovery cycle before sending the signal, resulting in a waste of time

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