Information retransmitting method for improving multicast efficiency of cellular system

Abstract

The invention provides an information retransmitting method for improving the multicast efficiency of a cellular system. The method comprises the following steps: the channel measurement is performed between every two devices for determining the frequency spectrum utilization ratio between the two devices; a base station sends multicast data for determining the number of devices which successfully receive the multicast data or fail to receive the multicast data; the devices are grouped, and the resource cost is calculated according to the frequency spectrum utilization ratio, the number of the devices which successfully receive the multicast data, the number of the devices which fail to receive the multicast data and the selection principle of a retransmission source set in advance; the corresponding device with the lowest resource cost is selected as the retransmission source of multicast data, meanwhile, the corresponding grouping method is recorded; the base station transmits the information of the device determined as the retransmission source as well as the group division information to all devices in the jurisdiction area; and the device selected as the retransmission source retransmits the received multicast date through an orthogonal resource. Therefore, the purpose of improving the multicast efficiency is achieved.

Description

technical field [0001] The invention relates to a cellular system multicast data transmission method, in particular to an information retransmission method for improving cellular system multicast efficiency. Background technique [0002] In the current infrastructure-based cellular mobile communication network, the base station (BS), as the central control node, is the only access point for mobile devices to obtain network services. All mobile devices can only communicate with a specific base station in the network through the uplink or downlink channel of the cellular system. However, when multiple mobile devices are close to each other, supporting direct communication (D2D: device-to-device, device-to-device) between mobile devices will bring many benefits to the existing cellular communication. These benefits include: longer device battery life, more efficient use of radio resources, greater signal coverage, and lower system interference levels. In recent years, the use...

AI Technical Summary

Problems solved by technology

In some cases, only one low-quality D2D link will cause the throughput of multicast in the entire D2D cluster to drop greatly, which is actually a waste of wireless resources

Images